drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/cdev.h>
  36 #include <linux/notifier.h>
  37 #include <linux/security.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/dma-mapping.h>
  42 #include <asm/byteorder.h>
  43 #include <linux/moduleparam.h>
  44
  45 #include "usb.h"
  46
  47 #define USB_MAXBUS                      64
  48 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  49 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  50
  51 /* Mutual exclusion for removal, open, and release */
  52 DEFINE_MUTEX(usbfs_mutex);
  53
  54 struct usb_dev_state {
  55         struct list_head list;      /* state list */
  56         struct usb_device *dev;
  57         struct file *file;
  58         spinlock_t lock;            /* protects the async urb lists */
  59         struct list_head async_pending;
  60         struct list_head async_completed;
  61         struct list_head memory_list;
  62         wait_queue_head_t wait;     /* wake up if a request completed */
  63         unsigned int discsignr;
  64         struct pid *disc_pid;
  65         const struct cred *cred;
  66         void __user *disccontext;
  67         unsigned long ifclaimed;
  68         u32 disabled_bulk_eps;
  69         bool privileges_dropped;
  70         unsigned long interface_allowed_mask;
  71 };
  72
  73 struct usb_memory {
  74         struct list_head memlist;
  75         int vma_use_count;
  76         int urb_use_count;
  77         u32 size;
  78         void *mem;
  79         dma_addr_t dma_handle;
  80         unsigned long vm_start;
  81         struct usb_dev_state *ps;
  82 };
  83
  84 struct async {
  85         struct list_head asynclist;
  86         struct usb_dev_state *ps;
  87         struct pid *pid;
  88         const struct cred *cred;
  89         unsigned int signr;
  90         unsigned int ifnum;
  91         void __user *userbuffer;
  92         void __user *userurb;
  93         struct urb *urb;
  94         struct usb_memory *usbm;
  95         unsigned int mem_usage;
  96         int status;
  97         u8 bulk_addr;
  98         u8 bulk_status;
  99 };
 100
 101 static bool usbfs_snoop;
 102 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 103 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 104
 105 static unsigned usbfs_snoop_max = 65536;
 106 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 107 MODULE_PARM_DESC(usbfs_snoop_max,
 108                 "maximum number of bytes to print while snooping");
 109
 110 #define snoop(dev, format, arg...)                              \
 111         do {                                                    \
 112                 if (usbfs_snoop)                                \
 113                         dev_info(dev, format, ## arg);          \
 114         } while (0)
 115
 116 enum snoop_when {
 117         SUBMIT, COMPLETE
 118 };
 119
 120 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 121
 122 /* Limit on the total amount of memory we can allocate for transfers */
 123 static u32 usbfs_memory_mb = 16;
 124 module_param(usbfs_memory_mb, uint, 0644);
 125 MODULE_PARM_DESC(usbfs_memory_mb,
 126                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 127
 128 /* Hard limit, necessary to avoid arithmetic overflow */
 129 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 130
 131 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 132
 133 /* Check whether it's okay to allocate more memory for a transfer */
 134 static int usbfs_increase_memory_usage(u64 amount)
 135 {
 136         u64 lim;
 137
 138         lim = READ_ONCE(usbfs_memory_mb);
 139         lim <<= 20;
 140
 141         atomic64_add(amount, &usbfs_memory_usage);
 142
 143         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 144                 atomic64_sub(amount, &usbfs_memory_usage);
 145                 return -ENOMEM;
 146         }
 147
 148         return 0;
 149 }
 150
 151 /* Memory for a transfer is being deallocated */
 152 static void usbfs_decrease_memory_usage(u64 amount)
 153 {
 154         atomic64_sub(amount, &usbfs_memory_usage);
 155 }
 156
 157 static int connected(struct usb_dev_state *ps)
 158 {
 159         return (!list_empty(&ps->list) &&
 160                         ps->dev->state != USB_STATE_NOTATTACHED);
 161 }
 162
 163 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 164 {
 165         struct usb_dev_state *ps = usbm->ps;
 166         unsigned long flags;
 167
 168         spin_lock_irqsave(&ps->lock, flags);
 169         --*count;
 170         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 171                 list_del(&usbm->memlist);
 172                 spin_unlock_irqrestore(&ps->lock, flags);
 173
 174                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 175                                 usbm->dma_handle);
 176                 usbfs_decrease_memory_usage(
 177                         usbm->size + sizeof(struct usb_memory));
 178                 kfree(usbm);
 179         } else {
 180                 spin_unlock_irqrestore(&ps->lock, flags);
 181         }
 182 }
 183
 184 static void usbdev_vm_open(struct vm_area_struct *vma)
 185 {
 186         struct usb_memory *usbm = vma->vm_private_data;
 187         unsigned long flags;
 188
 189         spin_lock_irqsave(&usbm->ps->lock, flags);
 190         ++usbm->vma_use_count;
 191         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 192 }
 193
 194 static void usbdev_vm_close(struct vm_area_struct *vma)
 195 {
 196         struct usb_memory *usbm = vma->vm_private_data;
 197
 198         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 199 }
 200
 201 static const struct vm_operations_struct usbdev_vm_ops = {
 202         .open = usbdev_vm_open,
 203         .close = usbdev_vm_close
 204 };
 205
 206 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 207 {
 208         struct usb_memory *usbm = NULL;
 209         struct usb_dev_state *ps = file->private_data;
 210         size_t size = vma->vm_end - vma->vm_start;
 211         void *mem;
 212         unsigned long flags;
 213         dma_addr_t dma_handle;
 214         int ret;
 215
 216         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 217         if (ret)
 218                 goto error;
 219
 220         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 221         if (!usbm) {
 222                 ret = -ENOMEM;
 223                 goto error_decrease_mem;
 224         }
 225
 226         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 227                         &dma_handle);
 228         if (!mem) {
 229                 ret = -ENOMEM;
 230                 goto error_free_usbm;
 231         }
 232
 233         memset(mem, 0, size);
 234
 235         usbm->mem = mem;
 236         usbm->dma_handle = dma_handle;
 237         usbm->size = size;
 238         usbm->ps = ps;
 239         usbm->vm_start = vma->vm_start;
 240         usbm->vma_use_count = 1;
 241         INIT_LIST_HEAD(&usbm->memlist);
 242
 243         if (remap_pfn_range(vma, vma->vm_start,
 244                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 245                         size, vma->vm_page_prot) < 0) {
 246                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 247                 return -EAGAIN;
 248         }
 249
 250         vma->vm_flags |= VM_IO;
 251         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 252         vma->vm_ops = &usbdev_vm_ops;
 253         vma->vm_private_data = usbm;
 254
 255         spin_lock_irqsave(&ps->lock, flags);
 256         list_add_tail(&usbm->memlist, &ps->memory_list);
 257         spin_unlock_irqrestore(&ps->lock, flags);
 258
 259         return 0;
 260
 261 error_free_usbm:
 262         kfree(usbm);
 263 error_decrease_mem:
 264         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 265 error:
 266         return ret;
 267 }
 268
 269 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 270                            loff_t *ppos)
 271 {
 272         struct usb_dev_state *ps = file->private_data;
 273         struct usb_device *dev = ps->dev;
 274         ssize_t ret = 0;
 275         unsigned len;
 276         loff_t pos;
 277         int i;
 278
 279         pos = *ppos;
 280         usb_lock_device(dev);
 281         if (!connected(ps)) {
 282                 ret = -ENODEV;
 283                 goto err;
 284         } else if (pos < 0) {
 285                 ret = -EINVAL;
 286                 goto err;
 287         }
 288
 289         if (pos < sizeof(struct usb_device_descriptor)) {
 290                 /* 18 bytes - fits on the stack */
 291                 struct usb_device_descriptor temp_desc;
 292
 293                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 294                 le16_to_cpus(&temp_desc.bcdUSB);
 295                 le16_to_cpus(&temp_desc.idVendor);
 296                 le16_to_cpus(&temp_desc.idProduct);
 297                 le16_to_cpus(&temp_desc.bcdDevice);
 298
 299                 len = sizeof(struct usb_device_descriptor) - pos;
 300                 if (len > nbytes)
 301                         len = nbytes;
 302                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 303                         ret = -EFAULT;
 304                         goto err;
 305                 }
 306
 307                 *ppos += len;
 308                 buf += len;
 309                 nbytes -= len;
 310                 ret += len;
 311         }
 312
 313         pos = sizeof(struct usb_device_descriptor);
 314         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 315                 struct usb_config_descriptor *config =
 316                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 317                 unsigned int length = le16_to_cpu(config->wTotalLength);
 318
 319                 if (*ppos < pos + length) {
 320
 321                         /* The descriptor may claim to be longer than it
 322                          * really is.  Here is the actual allocated length. */
 323                         unsigned alloclen =
 324                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 325
 326                         len = length - (*ppos - pos);
 327                         if (len > nbytes)
 328                                 len = nbytes;
 329
 330                         /* Simply don't write (skip over) unallocated parts */
 331                         if (alloclen > (*ppos - pos)) {
 332                                 alloclen -= (*ppos - pos);
 333                                 if (copy_to_user(buf,
 334                                     dev->rawdescriptors[i] + (*ppos - pos),
 335                                     min(len, alloclen))) {
 336                                         ret = -EFAULT;
 337                                         goto err;
 338                                 }
 339                         }
 340
 341                         *ppos += len;
 342                         buf += len;
 343                         nbytes -= len;
 344                         ret += len;
 345                 }
 346
 347                 pos += length;
 348         }
 349
 350 err:
 351         usb_unlock_device(dev);
 352         return ret;
 353 }
 354
 355 /*
 356  * async list handling
 357  */
 358
 359 static struct async *alloc_async(unsigned int numisoframes)
 360 {
 361         struct async *as;
 362
 363         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 364         if (!as)
 365                 return NULL;
 366         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 367         if (!as->urb) {
 368                 kfree(as);
 369                 return NULL;
 370         }
 371         return as;
 372 }
 373
 374 static void free_async(struct async *as)
 375 {
 376         int i;
 377
 378         put_pid(as->pid);
 379         if (as->cred)
 380                 put_cred(as->cred);
 381         for (i = 0; i < as->urb->num_sgs; i++) {
 382                 if (sg_page(&as->urb->sg[i]))
 383                         kfree(sg_virt(&as->urb->sg[i]));
 384         }
 385
 386         kfree(as->urb->sg);
 387         if (as->usbm == NULL)
 388                 kfree(as->urb->transfer_buffer);
 389         else
 390                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 391
 392         kfree(as->urb->setup_packet);
 393         usb_free_urb(as->urb);
 394         usbfs_decrease_memory_usage(as->mem_usage);
 395         kfree(as);
 396 }
 397
 398 static void async_newpending(struct async *as)
 399 {
 400         struct usb_dev_state *ps = as->ps;
 401         unsigned long flags;
 402
 403         spin_lock_irqsave(&ps->lock, flags);
 404         list_add_tail(&as->asynclist, &ps->async_pending);
 405         spin_unlock_irqrestore(&ps->lock, flags);
 406 }
 407
 408 static void async_removepending(struct async *as)
 409 {
 410         struct usb_dev_state *ps = as->ps;
 411         unsigned long flags;
 412
 413         spin_lock_irqsave(&ps->lock, flags);
 414         list_del_init(&as->asynclist);
 415         spin_unlock_irqrestore(&ps->lock, flags);
 416 }
 417
 418 static struct async *async_getcompleted(struct usb_dev_state *ps)
 419 {
 420         unsigned long flags;
 421         struct async *as = NULL;
 422
 423         spin_lock_irqsave(&ps->lock, flags);
 424         if (!list_empty(&ps->async_completed)) {
 425                 as = list_entry(ps->async_completed.next, struct async,
 426                                 asynclist);
 427                 list_del_init(&as->asynclist);
 428         }
 429         spin_unlock_irqrestore(&ps->lock, flags);
 430         return as;
 431 }
 432
 433 static struct async *async_getpending(struct usb_dev_state *ps,
 434                                              void __user *userurb)
 435 {
 436         struct async *as;
 437
 438         list_for_each_entry(as, &ps->async_pending, asynclist)
 439                 if (as->userurb == userurb) {
 440                         list_del_init(&as->asynclist);
 441                         return as;
 442                 }
 443
 444         return NULL;
 445 }
 446
 447 static void snoop_urb(struct usb_device *udev,
 448                 void __user *userurb, int pipe, unsigned length,
 449                 int timeout_or_status, enum snoop_when when,
 450                 unsigned char *data, unsigned data_len)
 451 {
 452         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 453         static const char *dirs[] = {"out", "in"};
 454         int ep;
 455         const char *t, *d;
 456
 457         if (!usbfs_snoop)
 458                 return;
 459
 460         ep = usb_pipeendpoint(pipe);
 461         t = types[usb_pipetype(pipe)];
 462         d = dirs[!!usb_pipein(pipe)];
 463
 464         if (userurb) {          /* Async */
 465                 if (when == SUBMIT)
 466                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 467                                         "length %u\n",
 468                                         userurb, ep, t, d, length);
 469                 else
 470                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 471                                         "actual_length %u status %d\n",
 472                                         userurb, ep, t, d, length,
 473                                         timeout_or_status);
 474         } else {
 475                 if (when == SUBMIT)
 476                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 477                                         "timeout %d\n",
 478                                         ep, t, d, length, timeout_or_status);
 479                 else
 480                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 481                                         "status %d\n",
 482                                         ep, t, d, length, timeout_or_status);
 483         }
 484
 485         data_len = min(data_len, usbfs_snoop_max);
 486         if (data && data_len > 0) {
 487                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 488                         data, data_len, 1);
 489         }
 490 }
 491
 492 static void snoop_urb_data(struct urb *urb, unsigned len)
 493 {
 494         int i, size;
 495
 496         len = min(len, usbfs_snoop_max);
 497         if (!usbfs_snoop || len == 0)
 498                 return;
 499
 500         if (urb->num_sgs == 0) {
 501                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 502                         urb->transfer_buffer, len, 1);
 503                 return;
 504         }
 505
 506         for (i = 0; i < urb->num_sgs && len; i++) {
 507                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 508                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 509                         sg_virt(&urb->sg[i]), size, 1);
 510                 len -= size;
 511         }
 512 }
 513
 514 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 515 {
 516         unsigned i, len, size;
 517
 518         if (urb->number_of_packets > 0)         /* Isochronous */
 519                 len = urb->transfer_buffer_length;
 520         else                                    /* Non-Isoc */
 521                 len = urb->actual_length;
 522
 523         if (urb->num_sgs == 0) {
 524                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 525                         return -EFAULT;
 526                 return 0;
 527         }
 528
 529         for (i = 0; i < urb->num_sgs && len; i++) {
 530                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 531                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 532                         return -EFAULT;
 533                 userbuffer += size;
 534                 len -= size;
 535         }
 536
 537         return 0;
 538 }
 539
 540 #define AS_CONTINUATION 1
 541 #define AS_UNLINK       2
 542
 543 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 544 __releases(ps->lock)
 545 __acquires(ps->lock)
 546 {
 547         struct urb *urb;
 548         struct async *as;
 549
 550         /* Mark all the pending URBs that match bulk_addr, up to but not
 551          * including the first one without AS_CONTINUATION.  If such an
 552          * URB is encountered then a new transfer has already started so
 553          * the endpoint doesn't need to be disabled; otherwise it does.
 554          */
 555         list_for_each_entry(as, &ps->async_pending, asynclist) {
 556                 if (as->bulk_addr == bulk_addr) {
 557                         if (as->bulk_status != AS_CONTINUATION)
 558                                 goto rescan;
 559                         as->bulk_status = AS_UNLINK;
 560                         as->bulk_addr = 0;
 561                 }
 562         }
 563         ps->disabled_bulk_eps |= (1 << bulk_addr);
 564
 565         /* Now carefully unlink all the marked pending URBs */
 566  rescan:
 567         list_for_each_entry(as, &ps->async_pending, asynclist) {
 568                 if (as->bulk_status == AS_UNLINK) {
 569                         as->bulk_status = 0;            /* Only once */
 570                         urb = as->urb;
 571                         usb_get_urb(urb);
 572                         spin_unlock(&ps->lock);         /* Allow completions */
 573                         usb_unlink_urb(urb);
 574                         usb_put_urb(urb);
 575                         spin_lock(&ps->lock);
 576                         goto rescan;
 577                 }
 578         }
 579 }
 580
 581 static void async_completed(struct urb *urb)
 582 {
 583         struct async *as = urb->context;
 584         struct usb_dev_state *ps = as->ps;
 585         struct siginfo sinfo;
 586         struct pid *pid = NULL;
 587         const struct cred *cred = NULL;
 588         int signr;
 589
 590         spin_lock(&ps->lock);
 591         list_move_tail(&as->asynclist, &ps->async_completed);
 592         as->status = urb->status;
 593         signr = as->signr;
 594         if (signr) {
 595                 clear_siginfo(&sinfo);
 596                 sinfo.si_signo = as->signr;
 597                 sinfo.si_errno = as->status;
 598                 sinfo.si_code = SI_ASYNCIO;
 599                 sinfo.si_addr = as->userurb;
 600                 pid = get_pid(as->pid);
 601                 cred = get_cred(as->cred);
 602         }
 603         snoop(&urb->dev->dev, "urb complete\n");
 604         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 605                         as->status, COMPLETE, NULL, 0);
 606         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
 607                 snoop_urb_data(urb, urb->actual_length);
 608
 609         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 610                         as->status != -ENOENT)
 611                 cancel_bulk_urbs(ps, as->bulk_addr);
 612
 613         wake_up(&ps->wait);
 614         spin_unlock(&ps->lock);
 615
 616         if (signr) {
 617                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
 618                 put_pid(pid);
 619                 put_cred(cred);
 620         }
 621 }
 622
 623 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 624 {
 625         struct urb *urb;
 626         struct async *as;
 627         unsigned long flags;
 628
 629         spin_lock_irqsave(&ps->lock, flags);
 630         while (!list_empty(list)) {
 631                 as = list_entry(list->next, struct async, asynclist);
 632                 list_del_init(&as->asynclist);
 633                 urb = as->urb;
 634                 usb_get_urb(urb);
 635
 636                 /* drop the spinlock so the completion handler can run */
 637                 spin_unlock_irqrestore(&ps->lock, flags);
 638                 usb_kill_urb(urb);
 639                 usb_put_urb(urb);
 640                 spin_lock_irqsave(&ps->lock, flags);
 641         }
 642         spin_unlock_irqrestore(&ps->lock, flags);
 643 }
 644
 645 static void destroy_async_on_interface(struct usb_dev_state *ps,
 646                                        unsigned int ifnum)
 647 {
 648         struct list_head *p, *q, hitlist;
 649         unsigned long flags;
 650
 651         INIT_LIST_HEAD(&hitlist);
 652         spin_lock_irqsave(&ps->lock, flags);
 653         list_for_each_safe(p, q, &ps->async_pending)
 654                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 655                         list_move_tail(p, &hitlist);
 656         spin_unlock_irqrestore(&ps->lock, flags);
 657         destroy_async(ps, &hitlist);
 658 }
 659
 660 static void destroy_all_async(struct usb_dev_state *ps)
 661 {
 662         destroy_async(ps, &ps->async_pending);
 663 }
 664
 665 /*
 666  * interface claims are made only at the request of user level code,
 667  * which can also release them (explicitly or by closing files).
 668  * they're also undone when devices disconnect.
 669  */
 670
 671 static int driver_probe(struct usb_interface *intf,
 672                         const struct usb_device_id *id)
 673 {
 674         return -ENODEV;
 675 }
 676
 677 static void driver_disconnect(struct usb_interface *intf)
 678 {
 679         struct usb_dev_state *ps = usb_get_intfdata(intf);
 680         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 681
 682         if (!ps)
 683                 return;
 684
 685         /* NOTE:  this relies on usbcore having canceled and completed
 686          * all pending I/O requests; 2.6 does that.
 687          */
 688
 689         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 690                 clear_bit(ifnum, &ps->ifclaimed);
 691         else
 692                 dev_warn(&intf->dev, "interface number %u out of range\n",
 693                          ifnum);
 694
 695         usb_set_intfdata(intf, NULL);
 696
 697         /* force async requests to complete */
 698         destroy_async_on_interface(ps, ifnum);
 699 }
 700
 701 /* The following routines are merely placeholders.  There is no way
 702  * to inform a user task about suspend or resumes.
 703  */
 704 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 705 {
 706         return 0;
 707 }
 708
 709 static int driver_resume(struct usb_interface *intf)
 710 {
 711         return 0;
 712 }
 713
 714 struct usb_driver usbfs_driver = {
 715         .name =         "usbfs",
 716         .probe =        driver_probe,
 717         .disconnect =   driver_disconnect,
 718         .suspend =      driver_suspend,
 719         .resume =       driver_resume,
 720 };
 721
 722 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 723 {
 724         struct usb_device *dev = ps->dev;
 725         struct usb_interface *intf;
 726         int err;
 727
 728         if (ifnum >= 8*sizeof(ps->ifclaimed))
 729                 return -EINVAL;
 730         /* already claimed */
 731         if (test_bit(ifnum, &ps->ifclaimed))
 732                 return 0;
 733
 734         if (ps->privileges_dropped &&
 735                         !test_bit(ifnum, &ps->interface_allowed_mask))
 736                 return -EACCES;
 737
 738         intf = usb_ifnum_to_if(dev, ifnum);
 739         if (!intf)
 740                 err = -ENOENT;
 741         else
 742                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 743         if (err == 0)
 744                 set_bit(ifnum, &ps->ifclaimed);
 745         return err;
 746 }
 747
 748 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 749 {
 750         struct usb_device *dev;
 751         struct usb_interface *intf;
 752         int err;
 753
 754         err = -EINVAL;
 755         if (ifnum >= 8*sizeof(ps->ifclaimed))
 756                 return err;
 757         dev = ps->dev;
 758         intf = usb_ifnum_to_if(dev, ifnum);
 759         if (!intf)
 760                 err = -ENOENT;
 761         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 762                 usb_driver_release_interface(&usbfs_driver, intf);
 763                 err = 0;
 764         }
 765         return err;
 766 }
 767
 768 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 769 {
 770         if (ps->dev->state != USB_STATE_CONFIGURED)
 771                 return -EHOSTUNREACH;
 772         if (ifnum >= 8*sizeof(ps->ifclaimed))
 773                 return -EINVAL;
 774         if (test_bit(ifnum, &ps->ifclaimed))
 775                 return 0;
 776         /* if not yet claimed, claim it for the driver */
 777         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 778                  "interface %u before use\n", task_pid_nr(current),
 779                  current->comm, ifnum);
 780         return claimintf(ps, ifnum);
 781 }
 782
 783 static int findintfep(struct usb_device *dev, unsigned int ep)
 784 {
 785         unsigned int i, j, e;
 786         struct usb_interface *intf;
 787         struct usb_host_interface *alts;
 788         struct usb_endpoint_descriptor *endpt;
 789
 790         if (ep & ~(USB_DIR_IN|0xf))
 791                 return -EINVAL;
 792         if (!dev->actconfig)
 793                 return -ESRCH;
 794         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 795                 intf = dev->actconfig->interface[i];
 796                 for (j = 0; j < intf->num_altsetting; j++) {
 797                         alts = &intf->altsetting[j];
 798                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 799                                 endpt = &alts->endpoint[e].desc;
 800                                 if (endpt->bEndpointAddress == ep)
 801                                         return alts->desc.bInterfaceNumber;
 802                         }
 803                 }
 804         }
 805         return -ENOENT;
 806 }
 807
 808 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 809                            unsigned int request, unsigned int index)
 810 {
 811         int ret = 0;
 812         struct usb_host_interface *alt_setting;
 813
 814         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 815          && ps->dev->state != USB_STATE_ADDRESS
 816          && ps->dev->state != USB_STATE_CONFIGURED)
 817                 return -EHOSTUNREACH;
 818         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 819                 return 0;
 820
 821         /*
 822          * check for the special corner case 'get_device_id' in the printer
 823          * class specification, which we always want to allow as it is used
 824          * to query things like ink level, etc.
 825          */
 826         if (requesttype == 0xa1 && request == 0) {
 827                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 828                                                    index >> 8, index & 0xff);
 829                 if (alt_setting
 830                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 831                         return 0;
 832         }
 833
 834         index &= 0xff;
 835         switch (requesttype & USB_RECIP_MASK) {
 836         case USB_RECIP_ENDPOINT:
 837                 if ((index & ~USB_DIR_IN) == 0)
 838                         return 0;
 839                 ret = findintfep(ps->dev, index);
 840                 if (ret < 0) {
 841                         /*
 842                          * Some not fully compliant Win apps seem to get
 843                          * index wrong and have the endpoint number here
 844                          * rather than the endpoint address (with the
 845                          * correct direction). Win does let this through,
 846                          * so we'll not reject it here but leave it to
 847                          * the device to not break KVM. But we warn.
 848                          */
 849                         ret = findintfep(ps->dev, index ^ 0x80);
 850                         if (ret >= 0)
 851                                 dev_info(&ps->dev->dev,
 852                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 853                                         __func__, task_pid_nr(current),
 854                                         current->comm, index, index ^ 0x80);
 855                 }
 856                 if (ret >= 0)
 857                         ret = checkintf(ps, ret);
 858                 break;
 859
 860         case USB_RECIP_INTERFACE:
 861                 ret = checkintf(ps, index);
 862                 break;
 863         }
 864         return ret;
 865 }
 866
 867 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 868                                                      unsigned char ep)
 869 {
 870         if (ep & USB_ENDPOINT_DIR_MASK)
 871                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 872         else
 873                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 874 }
 875
 876 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 877                                   struct usbdevfs_streams __user *streams,
 878                                   unsigned int *num_streams_ret,
 879                                   unsigned int *num_eps_ret,
 880                                   struct usb_host_endpoint ***eps_ret,
 881                                   struct usb_interface **intf_ret)
 882 {
 883         unsigned int i, num_streams, num_eps;
 884         struct usb_host_endpoint **eps;
 885         struct usb_interface *intf = NULL;
 886         unsigned char ep;
 887         int ifnum, ret;
 888
 889         if (get_user(num_streams, &streams->num_streams) ||
 890             get_user(num_eps, &streams->num_eps))
 891                 return -EFAULT;
 892
 893         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 894                 return -EINVAL;
 895
 896         /* The XHCI controller allows max 2 ^ 16 streams */
 897         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 898                 return -EINVAL;
 899
 900         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 901         if (!eps)
 902                 return -ENOMEM;
 903
 904         for (i = 0; i < num_eps; i++) {
 905                 if (get_user(ep, &streams->eps[i])) {
 906                         ret = -EFAULT;
 907                         goto error;
 908                 }
 909                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 910                 if (!eps[i]) {
 911                         ret = -EINVAL;
 912                         goto error;
 913                 }
 914
 915                 /* usb_alloc/free_streams operate on an usb_interface */
 916                 ifnum = findintfep(ps->dev, ep);
 917                 if (ifnum < 0) {
 918                         ret = ifnum;
 919                         goto error;
 920                 }
 921
 922                 if (i == 0) {
 923                         ret = checkintf(ps, ifnum);
 924                         if (ret < 0)
 925                                 goto error;
 926                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 927                 } else {
 928                         /* Verify all eps belong to the same interface */
 929                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 930                                 ret = -EINVAL;
 931                                 goto error;
 932                         }
 933                 }
 934         }
 935
 936         if (num_streams_ret)
 937                 *num_streams_ret = num_streams;
 938         *num_eps_ret = num_eps;
 939         *eps_ret = eps;
 940         *intf_ret = intf;
 941
 942         return 0;
 943
 944 error:
 945         kfree(eps);
 946         return ret;
 947 }
 948
 949 static int match_devt(struct device *dev, void *data)
 950 {
 951         return dev->devt == (dev_t) (unsigned long) data;
 952 }
 953
 954 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 955 {
 956         struct device *dev;
 957
 958         dev = bus_find_device(&usb_bus_type, NULL,
 959                               (void *) (unsigned long) devt, match_devt);
 960         if (!dev)
 961                 return NULL;
 962         return to_usb_device(dev);
 963 }
 964
 965 /*
 966  * file operations
 967  */
 968 static int usbdev_open(struct inode *inode, struct file *file)
 969 {
 970         struct usb_device *dev = NULL;
 971         struct usb_dev_state *ps;
 972         int ret;
 973
 974         ret = -ENOMEM;
 975         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 976         if (!ps)
 977                 goto out_free_ps;
 978
 979         ret = -ENODEV;
 980
 981         /* Protect against simultaneous removal or release */
 982         mutex_lock(&usbfs_mutex);
 983
 984         /* usbdev device-node */
 985         if (imajor(inode) == USB_DEVICE_MAJOR)
 986                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 987
 988         mutex_unlock(&usbfs_mutex);
 989
 990         if (!dev)
 991                 goto out_free_ps;
 992
 993         usb_lock_device(dev);
 994         if (dev->state == USB_STATE_NOTATTACHED)
 995                 goto out_unlock_device;
 996
 997         ret = usb_autoresume_device(dev);
 998         if (ret)
 999                 goto out_unlock_device;
1000
1001         ps->dev = dev;
1002         ps->file = file;
1003         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1004         spin_lock_init(&ps->lock);
1005         INIT_LIST_HEAD(&ps->list);
1006         INIT_LIST_HEAD(&ps->async_pending);
1007         INIT_LIST_HEAD(&ps->async_completed);
1008         INIT_LIST_HEAD(&ps->memory_list);
1009         init_waitqueue_head(&ps->wait);
1010         ps->disc_pid = get_pid(task_pid(current));
1011         ps->cred = get_current_cred();
1012         smp_wmb();
1013         list_add_tail(&ps->list, &dev->filelist);
1014         file->private_data = ps;
1015         usb_unlock_device(dev);
1016         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1017                         current->comm);
1018         return ret;
1019
1020  out_unlock_device:
1021         usb_unlock_device(dev);
1022         usb_put_dev(dev);
1023  out_free_ps:
1024         kfree(ps);
1025         return ret;
1026 }
1027
1028 static int usbdev_release(struct inode *inode, struct file *file)
1029 {
1030         struct usb_dev_state *ps = file->private_data;
1031         struct usb_device *dev = ps->dev;
1032         unsigned int ifnum;
1033         struct async *as;
1034
1035         usb_lock_device(dev);
1036         usb_hub_release_all_ports(dev, ps);
1037
1038         list_del_init(&ps->list);
1039
1040         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1041                         ifnum++) {
1042                 if (test_bit(ifnum, &ps->ifclaimed))
1043                         releaseintf(ps, ifnum);
1044         }
1045         destroy_all_async(ps);
1046         usb_autosuspend_device(dev);
1047         usb_unlock_device(dev);
1048         usb_put_dev(dev);
1049         put_pid(ps->disc_pid);
1050         put_cred(ps->cred);
1051
1052         as = async_getcompleted(ps);
1053         while (as) {
1054                 free_async(as);
1055                 as = async_getcompleted(ps);
1056         }
1057
1058         kfree(ps);
1059         return 0;
1060 }
1061
1062 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1063 {
1064         struct usb_device *dev = ps->dev;
1065         struct usbdevfs_ctrltransfer ctrl;
1066         unsigned int tmo;
1067         unsigned char *tbuf;
1068         unsigned wLength;
1069         int i, pipe, ret;
1070
1071         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1072                 return -EFAULT;
1073         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1074                               ctrl.wIndex);
1075         if (ret)
1076                 return ret;
1077         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1078         if (wLength > PAGE_SIZE)
1079                 return -EINVAL;
1080         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1081                         sizeof(struct usb_ctrlrequest));
1082         if (ret)
1083                 return ret;
1084         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1085         if (!tbuf) {
1086                 ret = -ENOMEM;
1087                 goto done;
1088         }
1089         tmo = ctrl.timeout;
1090         snoop(&dev->dev, "control urb: bRequestType=%02x "
1091                 "bRequest=%02x wValue=%04x "
1092                 "wIndex=%04x wLength=%04x\n",
1093                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1094                 ctrl.wIndex, ctrl.wLength);
1095         if (ctrl.bRequestType & 0x80) {
1096                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1097                                                ctrl.wLength)) {
1098                         ret = -EINVAL;
1099                         goto done;
1100                 }
1101                 pipe = usb_rcvctrlpipe(dev, 0);
1102                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1103
1104                 usb_unlock_device(dev);
1105                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1106                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1107                                     tbuf, ctrl.wLength, tmo);
1108                 usb_lock_device(dev);
1109                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1110                           tbuf, max(i, 0));
1111                 if ((i > 0) && ctrl.wLength) {
1112                         if (copy_to_user(ctrl.data, tbuf, i)) {
1113                                 ret = -EFAULT;
1114                                 goto done;
1115                         }
1116                 }
1117         } else {
1118                 if (ctrl.wLength) {
1119                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1120                                 ret = -EFAULT;
1121                                 goto done;
1122                         }
1123                 }
1124                 pipe = usb_sndctrlpipe(dev, 0);
1125                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1126                         tbuf, ctrl.wLength);
1127
1128                 usb_unlock_device(dev);
1129                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1130                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1131                                     tbuf, ctrl.wLength, tmo);
1132                 usb_lock_device(dev);
1133                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1134         }
1135         if (i < 0 && i != -EPIPE) {
1136                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1137                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1138                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1139                            ctrl.wLength, i);
1140         }
1141         ret = i;
1142  done:
1143         free_page((unsigned long) tbuf);
1144         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1145                         sizeof(struct usb_ctrlrequest));
1146         return ret;
1147 }
1148
1149 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1150 {
1151         struct usb_device *dev = ps->dev;
1152         struct usbdevfs_bulktransfer bulk;
1153         unsigned int tmo, len1, pipe;
1154         int len2;
1155         unsigned char *tbuf;
1156         int i, ret;
1157
1158         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1159                 return -EFAULT;
1160         ret = findintfep(ps->dev, bulk.ep);
1161         if (ret < 0)
1162                 return ret;
1163         ret = checkintf(ps, ret);
1164         if (ret)
1165                 return ret;
1166         if (bulk.ep & USB_DIR_IN)
1167                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1168         else
1169                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1170         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1171                 return -EINVAL;
1172         len1 = bulk.len;
1173         if (len1 >= (INT_MAX - sizeof(struct urb)))
1174                 return -EINVAL;
1175         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1176         if (ret)
1177                 return ret;
1178         tbuf = kmalloc(len1, GFP_KERNEL);
1179         if (!tbuf) {
1180                 ret = -ENOMEM;
1181                 goto done;
1182         }
1183         tmo = bulk.timeout;
1184         if (bulk.ep & 0x80) {
1185                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1186                         ret = -EINVAL;
1187                         goto done;
1188                 }
1189                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1190
1191                 usb_unlock_device(dev);
1192                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1193                 usb_lock_device(dev);
1194                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1195
1196                 if (!i && len2) {
1197                         if (copy_to_user(bulk.data, tbuf, len2)) {
1198                                 ret = -EFAULT;
1199                                 goto done;
1200                         }
1201                 }
1202         } else {
1203                 if (len1) {
1204                         if (copy_from_user(tbuf, bulk.data, len1)) {
1205                                 ret = -EFAULT;
1206                                 goto done;
1207                         }
1208                 }
1209                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1210
1211                 usb_unlock_device(dev);
1212                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1213                 usb_lock_device(dev);
1214                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1215         }
1216         ret = (i < 0 ? i : len2);
1217  done:
1218         kfree(tbuf);
1219         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1220         return ret;
1221 }
1222
1223 static void check_reset_of_active_ep(struct usb_device *udev,
1224                 unsigned int epnum, char *ioctl_name)
1225 {
1226         struct usb_host_endpoint **eps;
1227         struct usb_host_endpoint *ep;
1228
1229         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1230         ep = eps[epnum & 0x0f];
1231         if (ep && !list_empty(&ep->urb_list))
1232                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1233                                 task_pid_nr(current), current->comm,
1234                                 ioctl_name, epnum);
1235 }
1236
1237 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1238 {
1239         unsigned int ep;
1240         int ret;
1241
1242         if (get_user(ep, (unsigned int __user *)arg))
1243                 return -EFAULT;
1244         ret = findintfep(ps->dev, ep);
1245         if (ret < 0)
1246                 return ret;
1247         ret = checkintf(ps, ret);
1248         if (ret)
1249                 return ret;
1250         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1251         usb_reset_endpoint(ps->dev, ep);
1252         return 0;
1253 }
1254
1255 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1256 {
1257         unsigned int ep;
1258         int pipe;
1259         int ret;
1260
1261         if (get_user(ep, (unsigned int __user *)arg))
1262                 return -EFAULT;
1263         ret = findintfep(ps->dev, ep);
1264         if (ret < 0)
1265                 return ret;
1266         ret = checkintf(ps, ret);
1267         if (ret)
1268                 return ret;
1269         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1270         if (ep & USB_DIR_IN)
1271                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1272         else
1273                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1274
1275         return usb_clear_halt(ps->dev, pipe);
1276 }
1277
1278 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1279 {
1280         struct usbdevfs_getdriver gd;
1281         struct usb_interface *intf;
1282         int ret;
1283
1284         if (copy_from_user(&gd, arg, sizeof(gd)))
1285                 return -EFAULT;
1286         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1287         if (!intf || !intf->dev.driver)
1288                 ret = -ENODATA;
1289         else {
1290                 strlcpy(gd.driver, intf->dev.driver->name,
1291                                 sizeof(gd.driver));
1292                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1293         }
1294         return ret;
1295 }
1296
1297 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1298 {
1299         struct usbdevfs_connectinfo ci;
1300
1301         memset(&ci, 0, sizeof(ci));
1302         ci.devnum = ps->dev->devnum;
1303         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1304
1305         if (copy_to_user(arg, &ci, sizeof(ci)))
1306                 return -EFAULT;
1307         return 0;
1308 }
1309
1310 static int proc_resetdevice(struct usb_dev_state *ps)
1311 {
1312         struct usb_host_config *actconfig = ps->dev->actconfig;
1313         struct usb_interface *interface;
1314         int i, number;
1315
1316         /* Don't allow a device reset if the process has dropped the
1317          * privilege to do such things and any of the interfaces are
1318          * currently claimed.
1319          */
1320         if (ps->privileges_dropped && actconfig) {
1321                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1322                         interface = actconfig->interface[i];
1323                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1324                         if (usb_interface_claimed(interface) &&
1325                                         !test_bit(number, &ps->ifclaimed)) {
1326                                 dev_warn(&ps->dev->dev,
1327                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1328                                         number, interface->dev.driver->name, current->comm);
1329                                 return -EACCES;
1330                         }
1331                 }
1332         }
1333
1334         return usb_reset_device(ps->dev);
1335 }
1336
1337 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1338 {
1339         struct usbdevfs_setinterface setintf;
1340         int ret;
1341
1342         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1343                 return -EFAULT;
1344         ret = checkintf(ps, setintf.interface);
1345         if (ret)
1346                 return ret;
1347
1348         destroy_async_on_interface(ps, setintf.interface);
1349
1350         return usb_set_interface(ps->dev, setintf.interface,
1351                         setintf.altsetting);
1352 }
1353
1354 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1355 {
1356         int u;
1357         int status = 0;
1358         struct usb_host_config *actconfig;
1359
1360         if (get_user(u, (int __user *)arg))
1361                 return -EFAULT;
1362
1363         actconfig = ps->dev->actconfig;
1364
1365         /* Don't touch the device if any interfaces are claimed.
1366          * It could interfere with other drivers' operations, and if
1367          * an interface is claimed by usbfs it could easily deadlock.
1368          */
1369         if (actconfig) {
1370                 int i;
1371
1372                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1373                         if (usb_interface_claimed(actconfig->interface[i])) {
1374                                 dev_warn(&ps->dev->dev,
1375                                         "usbfs: interface %d claimed by %s "
1376                                         "while '%s' sets config #%d\n",
1377                                         actconfig->interface[i]
1378                                                 ->cur_altsetting
1379                                                 ->desc.bInterfaceNumber,
1380                                         actconfig->interface[i]
1381                                                 ->dev.driver->name,
1382                                         current->comm, u);
1383                                 status = -EBUSY;
1384                                 break;
1385                         }
1386                 }
1387         }
1388
1389         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1390          * so avoid usb_set_configuration()'s kick to sysfs
1391          */
1392         if (status == 0) {
1393                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1394                         status = usb_reset_configuration(ps->dev);
1395                 else
1396                         status = usb_set_configuration(ps->dev, u);
1397         }
1398
1399         return status;
1400 }
1401
1402 static struct usb_memory *
1403 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1404 {
1405         struct usb_memory *usbm = NULL, *iter;
1406         unsigned long flags;
1407         unsigned long uurb_start = (unsigned long)uurb->buffer;
1408
1409         spin_lock_irqsave(&ps->lock, flags);
1410         list_for_each_entry(iter, &ps->memory_list, memlist) {
1411                 if (uurb_start >= iter->vm_start &&
1412                                 uurb_start < iter->vm_start + iter->size) {
1413                         if (uurb->buffer_length > iter->vm_start + iter->size -
1414                                         uurb_start) {
1415                                 usbm = ERR_PTR(-EINVAL);
1416                         } else {
1417                                 usbm = iter;
1418                                 usbm->urb_use_count++;
1419                         }
1420                         break;
1421                 }
1422         }
1423         spin_unlock_irqrestore(&ps->lock, flags);
1424         return usbm;
1425 }
1426
1427 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1428                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1429                         void __user *arg)
1430 {
1431         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1432         struct usb_host_endpoint *ep;
1433         struct async *as = NULL;
1434         struct usb_ctrlrequest *dr = NULL;
1435         unsigned int u, totlen, isofrmlen;
1436         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1437         int number_of_packets = 0;
1438         unsigned int stream_id = 0;
1439         void *buf;
1440         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1441                                 USBDEVFS_URB_BULK_CONTINUATION |
1442                                 USBDEVFS_URB_NO_FSBR |
1443                                 USBDEVFS_URB_ZERO_PACKET |
1444                                 USBDEVFS_URB_NO_INTERRUPT;
1445         /* USBDEVFS_URB_ISO_ASAP is a special case */
1446         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1447                 mask |= USBDEVFS_URB_ISO_ASAP;
1448
1449         if (uurb->flags & ~mask)
1450                         return -EINVAL;
1451
1452         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1453                 return -EINVAL;
1454         if (uurb->buffer_length > 0 && !uurb->buffer)
1455                 return -EINVAL;
1456         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1457             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1458                 ifnum = findintfep(ps->dev, uurb->endpoint);
1459                 if (ifnum < 0)
1460                         return ifnum;
1461                 ret = checkintf(ps, ifnum);
1462                 if (ret)
1463                         return ret;
1464         }
1465         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1466         if (!ep)
1467                 return -ENOENT;
1468         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1469
1470         u = 0;
1471         switch (uurb->type) {
1472         case USBDEVFS_URB_TYPE_CONTROL:
1473                 if (!usb_endpoint_xfer_control(&ep->desc))
1474                         return -EINVAL;
1475                 /* min 8 byte setup packet */
1476                 if (uurb->buffer_length < 8)
1477                         return -EINVAL;
1478                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1479                 if (!dr)
1480                         return -ENOMEM;
1481                 if (copy_from_user(dr, uurb->buffer, 8)) {
1482                         ret = -EFAULT;
1483                         goto error;
1484                 }
1485                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1486                         ret = -EINVAL;
1487                         goto error;
1488                 }
1489                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1490                                       le16_to_cpup(&dr->wIndex));
1491                 if (ret)
1492                         goto error;
1493                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1494                 uurb->buffer += 8;
1495                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1496                         is_in = 1;
1497                         uurb->endpoint |= USB_DIR_IN;
1498                 } else {
1499                         is_in = 0;
1500                         uurb->endpoint &= ~USB_DIR_IN;
1501                 }
1502                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1503                         "bRequest=%02x wValue=%04x "
1504                         "wIndex=%04x wLength=%04x\n",
1505                         dr->bRequestType, dr->bRequest,
1506                         __le16_to_cpup(&dr->wValue),
1507                         __le16_to_cpup(&dr->wIndex),
1508                         __le16_to_cpup(&dr->wLength));
1509                 u = sizeof(struct usb_ctrlrequest);
1510                 break;
1511
1512         case USBDEVFS_URB_TYPE_BULK:
1513                 switch (usb_endpoint_type(&ep->desc)) {
1514                 case USB_ENDPOINT_XFER_CONTROL:
1515                 case USB_ENDPOINT_XFER_ISOC:
1516                         return -EINVAL;
1517                 case USB_ENDPOINT_XFER_INT:
1518                         /* allow single-shot interrupt transfers */
1519                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1520                         goto interrupt_urb;
1521                 }
1522                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1523                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1524                         num_sgs = 0;
1525                 if (ep->streams)
1526                         stream_id = uurb->stream_id;
1527                 break;
1528
1529         case USBDEVFS_URB_TYPE_INTERRUPT:
1530                 if (!usb_endpoint_xfer_int(&ep->desc))
1531                         return -EINVAL;
1532  interrupt_urb:
1533                 break;
1534
1535         case USBDEVFS_URB_TYPE_ISO:
1536                 /* arbitrary limit */
1537                 if (uurb->number_of_packets < 1 ||
1538                     uurb->number_of_packets > 128)
1539                         return -EINVAL;
1540                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1541                         return -EINVAL;
1542                 number_of_packets = uurb->number_of_packets;
1543                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1544                                    number_of_packets;
1545                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1546                 if (IS_ERR(isopkt)) {
1547                         ret = PTR_ERR(isopkt);
1548                         isopkt = NULL;
1549                         goto error;
1550                 }
1551                 for (totlen = u = 0; u < number_of_packets; u++) {
1552                         /*
1553                          * arbitrary limit need for USB 3.0
1554                          * bMaxBurst (0~15 allowed, 1~16 packets)
1555                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1556                          * sizemax: 1024 * 16 * 3 = 49152
1557                          */
1558                         if (isopkt[u].length > 49152) {
1559                                 ret = -EINVAL;
1560                                 goto error;
1561                         }
1562                         totlen += isopkt[u].length;
1563                 }
1564                 u *= sizeof(struct usb_iso_packet_descriptor);
1565                 uurb->buffer_length = totlen;
1566                 break;
1567
1568         default:
1569                 return -EINVAL;
1570         }
1571
1572         if (uurb->buffer_length > 0 &&
1573                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1574                                 uurb->buffer, uurb->buffer_length)) {
1575                 ret = -EFAULT;
1576                 goto error;
1577         }
1578         as = alloc_async(number_of_packets);
1579         if (!as) {
1580                 ret = -ENOMEM;
1581                 goto error;
1582         }
1583
1584         as->usbm = find_memory_area(ps, uurb);
1585         if (IS_ERR(as->usbm)) {
1586                 ret = PTR_ERR(as->usbm);
1587                 as->usbm = NULL;
1588                 goto error;
1589         }
1590
1591         /* do not use SG buffers when memory mapped segments
1592          * are in use
1593          */
1594         if (as->usbm)
1595                 num_sgs = 0;
1596
1597         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1598              num_sgs * sizeof(struct scatterlist);
1599         ret = usbfs_increase_memory_usage(u);
1600         if (ret)
1601                 goto error;
1602         as->mem_usage = u;
1603
1604         if (num_sgs) {
1605                 as->urb->sg = kmalloc_array(num_sgs,
1606                                             sizeof(struct scatterlist),
1607                                             GFP_KERNEL);
1608                 if (!as->urb->sg) {
1609                         ret = -ENOMEM;
1610                         goto error;
1611                 }
1612                 as->urb->num_sgs = num_sgs;
1613                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1614
1615                 totlen = uurb->buffer_length;
1616                 for (i = 0; i < as->urb->num_sgs; i++) {
1617                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1618                         buf = kmalloc(u, GFP_KERNEL);
1619                         if (!buf) {
1620                                 ret = -ENOMEM;
1621                                 goto error;
1622                         }
1623                         sg_set_buf(&as->urb->sg[i], buf, u);
1624
1625                         if (!is_in) {
1626                                 if (copy_from_user(buf, uurb->buffer, u)) {
1627                                         ret = -EFAULT;
1628                                         goto error;
1629                                 }
1630                                 uurb->buffer += u;
1631                         }
1632                         totlen -= u;
1633                 }
1634         } else if (uurb->buffer_length > 0) {
1635                 if (as->usbm) {
1636                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1637
1638                         as->urb->transfer_buffer = as->usbm->mem +
1639                                         (uurb_start - as->usbm->vm_start);
1640                 } else {
1641                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1642                                         GFP_KERNEL);
1643                         if (!as->urb->transfer_buffer) {
1644                                 ret = -ENOMEM;
1645                                 goto error;
1646                         }
1647                         if (!is_in) {
1648                                 if (copy_from_user(as->urb->transfer_buffer,
1649                                                    uurb->buffer,
1650                                                    uurb->buffer_length)) {
1651                                         ret = -EFAULT;
1652                                         goto error;
1653                                 }
1654                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1655                                 /*
1656                                  * Isochronous input data may end up being
1657                                  * discontiguous if some of the packets are
1658                                  * short. Clear the buffer so that the gaps
1659                                  * don't leak kernel data to userspace.
1660                                  */
1661                                 memset(as->urb->transfer_buffer, 0,
1662                                                 uurb->buffer_length);
1663                         }
1664                 }
1665         }
1666         as->urb->dev = ps->dev;
1667         as->urb->pipe = (uurb->type << 30) |
1668                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1669                         (uurb->endpoint & USB_DIR_IN);
1670
1671         /* This tedious sequence is necessary because the URB_* flags
1672          * are internal to the kernel and subject to change, whereas
1673          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1674          */
1675         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1676         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1677                 u |= URB_ISO_ASAP;
1678         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1679                 u |= URB_SHORT_NOT_OK;
1680         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1681                 u |= URB_ZERO_PACKET;
1682         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1683                 u |= URB_NO_INTERRUPT;
1684         as->urb->transfer_flags = u;
1685
1686         as->urb->transfer_buffer_length = uurb->buffer_length;
1687         as->urb->setup_packet = (unsigned char *)dr;
1688         dr = NULL;
1689         as->urb->start_frame = uurb->start_frame;
1690         as->urb->number_of_packets = number_of_packets;
1691         as->urb->stream_id = stream_id;
1692
1693         if (ep->desc.bInterval) {
1694                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1695                                 ps->dev->speed == USB_SPEED_HIGH ||
1696                                 ps->dev->speed >= USB_SPEED_SUPER)
1697                         as->urb->interval = 1 <<
1698                                         min(15, ep->desc.bInterval - 1);
1699                 else
1700                         as->urb->interval = ep->desc.bInterval;
1701         }
1702
1703         as->urb->context = as;
1704         as->urb->complete = async_completed;
1705         for (totlen = u = 0; u < number_of_packets; u++) {
1706                 as->urb->iso_frame_desc[u].offset = totlen;
1707                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1708                 totlen += isopkt[u].length;
1709         }
1710         kfree(isopkt);
1711         isopkt = NULL;
1712         as->ps = ps;
1713         as->userurb = arg;
1714         if (as->usbm) {
1715                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1716
1717                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1718                 as->urb->transfer_dma = as->usbm->dma_handle +
1719                                 (uurb_start - as->usbm->vm_start);
1720         } else if (is_in && uurb->buffer_length > 0)
1721                 as->userbuffer = uurb->buffer;
1722         as->signr = uurb->signr;
1723         as->ifnum = ifnum;
1724         as->pid = get_pid(task_pid(current));
1725         as->cred = get_current_cred();
1726         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1727                         as->urb->transfer_buffer_length, 0, SUBMIT,
1728                         NULL, 0);
1729         if (!is_in)
1730                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1731
1732         async_newpending(as);
1733
1734         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1735                 spin_lock_irq(&ps->lock);
1736
1737                 /* Not exactly the endpoint address; the direction bit is
1738                  * shifted to the 0x10 position so that the value will be
1739                  * between 0 and 31.
1740                  */
1741                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1742                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1743                                 >> 3);
1744
1745                 /* If this bulk URB is the start of a new transfer, re-enable
1746                  * the endpoint.  Otherwise mark it as a continuation URB.
1747                  */
1748                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1749                         as->bulk_status = AS_CONTINUATION;
1750                 else
1751                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1752
1753                 /* Don't accept continuation URBs if the endpoint is
1754                  * disabled because of an earlier error.
1755                  */
1756                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1757                         ret = -EREMOTEIO;
1758                 else
1759                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1760                 spin_unlock_irq(&ps->lock);
1761         } else {
1762                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1763         }
1764
1765         if (ret) {
1766                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1767                            "usbfs: usb_submit_urb returned %d\n", ret);
1768                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1769                                 0, ret, COMPLETE, NULL, 0);
1770                 async_removepending(as);
1771                 goto error;
1772         }
1773         return 0;
1774
1775  error:
1776         if (as && as->usbm)
1777                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1778         kfree(isopkt);
1779         kfree(dr);
1780         if (as)
1781                 free_async(as);
1782         return ret;
1783 }
1784
1785 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1786 {
1787         struct usbdevfs_urb uurb;
1788
1789         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1790                 return -EFAULT;
1791
1792         return proc_do_submiturb(ps, &uurb,
1793                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1794                         arg);
1795 }
1796
1797 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1798 {
1799         struct urb *urb;
1800         struct async *as;
1801         unsigned long flags;
1802
1803         spin_lock_irqsave(&ps->lock, flags);
1804         as = async_getpending(ps, arg);
1805         if (!as) {
1806                 spin_unlock_irqrestore(&ps->lock, flags);
1807                 return -EINVAL;
1808         }
1809
1810         urb = as->urb;
1811         usb_get_urb(urb);
1812         spin_unlock_irqrestore(&ps->lock, flags);
1813
1814         usb_kill_urb(urb);
1815         usb_put_urb(urb);
1816
1817         return 0;
1818 }
1819
1820 static void compute_isochronous_actual_length(struct urb *urb)
1821 {
1822         unsigned int i;
1823
1824         if (urb->number_of_packets > 0) {
1825                 urb->actual_length = 0;
1826                 for (i = 0; i < urb->number_of_packets; i++)
1827                         urb->actual_length +=
1828                                         urb->iso_frame_desc[i].actual_length;
1829         }
1830 }
1831
1832 static int processcompl(struct async *as, void __user * __user *arg)
1833 {
1834         struct urb *urb = as->urb;
1835         struct usbdevfs_urb __user *userurb = as->userurb;
1836         void __user *addr = as->userurb;
1837         unsigned int i;
1838
1839         compute_isochronous_actual_length(urb);
1840         if (as->userbuffer && urb->actual_length) {
1841                 if (copy_urb_data_to_user(as->userbuffer, urb))
1842                         goto err_out;
1843         }
1844         if (put_user(as->status, &userurb->status))
1845                 goto err_out;
1846         if (put_user(urb->actual_length, &userurb->actual_length))
1847                 goto err_out;
1848         if (put_user(urb->error_count, &userurb->error_count))
1849                 goto err_out;
1850
1851         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1852                 for (i = 0; i < urb->number_of_packets; i++) {
1853                         if (put_user(urb->iso_frame_desc[i].actual_length,
1854                                      &userurb->iso_frame_desc[i].actual_length))
1855                                 goto err_out;
1856                         if (put_user(urb->iso_frame_desc[i].status,
1857                                      &userurb->iso_frame_desc[i].status))
1858                                 goto err_out;
1859                 }
1860         }
1861
1862         if (put_user(addr, (void __user * __user *)arg))
1863                 return -EFAULT;
1864         return 0;
1865
1866 err_out:
1867         return -EFAULT;
1868 }
1869
1870 static struct async *reap_as(struct usb_dev_state *ps)
1871 {
1872         DECLARE_WAITQUEUE(wait, current);
1873         struct async *as = NULL;
1874         struct usb_device *dev = ps->dev;
1875
1876         add_wait_queue(&ps->wait, &wait);
1877         for (;;) {
1878                 __set_current_state(TASK_INTERRUPTIBLE);
1879                 as = async_getcompleted(ps);
1880                 if (as || !connected(ps))
1881                         break;
1882                 if (signal_pending(current))
1883                         break;
1884                 usb_unlock_device(dev);
1885                 schedule();
1886                 usb_lock_device(dev);
1887         }
1888         remove_wait_queue(&ps->wait, &wait);
1889         set_current_state(TASK_RUNNING);
1890         return as;
1891 }
1892
1893 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1894 {
1895         struct async *as = reap_as(ps);
1896
1897         if (as) {
1898                 int retval;
1899
1900                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1901                 retval = processcompl(as, (void __user * __user *)arg);
1902                 free_async(as);
1903                 return retval;
1904         }
1905         if (signal_pending(current))
1906                 return -EINTR;
1907         return -ENODEV;
1908 }
1909
1910 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1911 {
1912         int retval;
1913         struct async *as;
1914
1915         as = async_getcompleted(ps);
1916         if (as) {
1917                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1918                 retval = processcompl(as, (void __user * __user *)arg);
1919                 free_async(as);
1920         } else {
1921                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1922         }
1923         return retval;
1924 }
1925
1926 #ifdef CONFIG_COMPAT
1927 static int proc_control_compat(struct usb_dev_state *ps,
1928                                 struct usbdevfs_ctrltransfer32 __user *p32)
1929 {
1930         struct usbdevfs_ctrltransfer __user *p;
1931         __u32 udata;
1932         p = compat_alloc_user_space(sizeof(*p));
1933         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1934             get_user(udata, &p32->data) ||
1935             put_user(compat_ptr(udata), &p->data))
1936                 return -EFAULT;
1937         return proc_control(ps, p);
1938 }
1939
1940 static int proc_bulk_compat(struct usb_dev_state *ps,
1941                         struct usbdevfs_bulktransfer32 __user *p32)
1942 {
1943         struct usbdevfs_bulktransfer __user *p;
1944         compat_uint_t n;
1945         compat_caddr_t addr;
1946
1947         p = compat_alloc_user_space(sizeof(*p));
1948
1949         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1950             get_user(n, &p32->len) || put_user(n, &p->len) ||
1951             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1952             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1953                 return -EFAULT;
1954
1955         return proc_bulk(ps, p);
1956 }
1957 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1958 {
1959         struct usbdevfs_disconnectsignal32 ds;
1960
1961         if (copy_from_user(&ds, arg, sizeof(ds)))
1962                 return -EFAULT;
1963         ps->discsignr = ds.signr;
1964         ps->disccontext = compat_ptr(ds.context);
1965         return 0;
1966 }
1967
1968 static int get_urb32(struct usbdevfs_urb *kurb,
1969                      struct usbdevfs_urb32 __user *uurb)
1970 {
1971         struct usbdevfs_urb32 urb32;
1972         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
1973                 return -EFAULT;
1974         kurb->type = urb32.type;
1975         kurb->endpoint = urb32.endpoint;
1976         kurb->status = urb32.status;
1977         kurb->flags = urb32.flags;
1978         kurb->buffer = compat_ptr(urb32.buffer);
1979         kurb->buffer_length = urb32.buffer_length;
1980         kurb->actual_length = urb32.actual_length;
1981         kurb->start_frame = urb32.start_frame;
1982         kurb->number_of_packets = urb32.number_of_packets;
1983         kurb->error_count = urb32.error_count;
1984         kurb->signr = urb32.signr;
1985         kurb->usercontext = compat_ptr(urb32.usercontext);
1986         return 0;
1987 }
1988
1989 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1990 {
1991         struct usbdevfs_urb uurb;
1992
1993         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1994                 return -EFAULT;
1995
1996         return proc_do_submiturb(ps, &uurb,
1997                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1998                         arg);
1999 }
2000
2001 static int processcompl_compat(struct async *as, void __user * __user *arg)
2002 {
2003         struct urb *urb = as->urb;
2004         struct usbdevfs_urb32 __user *userurb = as->userurb;
2005         void __user *addr = as->userurb;
2006         unsigned int i;
2007
2008         compute_isochronous_actual_length(urb);
2009         if (as->userbuffer && urb->actual_length) {
2010                 if (copy_urb_data_to_user(as->userbuffer, urb))
2011                         return -EFAULT;
2012         }
2013         if (put_user(as->status, &userurb->status))
2014                 return -EFAULT;
2015         if (put_user(urb->actual_length, &userurb->actual_length))
2016                 return -EFAULT;
2017         if (put_user(urb->error_count, &userurb->error_count))
2018                 return -EFAULT;
2019
2020         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2021                 for (i = 0; i < urb->number_of_packets; i++) {
2022                         if (put_user(urb->iso_frame_desc[i].actual_length,
2023                                      &userurb->iso_frame_desc[i].actual_length))
2024                                 return -EFAULT;
2025                         if (put_user(urb->iso_frame_desc[i].status,
2026                                      &userurb->iso_frame_desc[i].status))
2027                                 return -EFAULT;
2028                 }
2029         }
2030
2031         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2032                 return -EFAULT;
2033         return 0;
2034 }
2035
2036 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2037 {
2038         struct async *as = reap_as(ps);
2039
2040         if (as) {
2041                 int retval;
2042
2043                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2044                 retval = processcompl_compat(as, (void __user * __user *)arg);
2045                 free_async(as);
2046                 return retval;
2047         }
2048         if (signal_pending(current))
2049                 return -EINTR;
2050         return -ENODEV;
2051 }
2052
2053 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2054 {
2055         int retval;
2056         struct async *as;
2057
2058         as = async_getcompleted(ps);
2059         if (as) {
2060                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2061                 retval = processcompl_compat(as, (void __user * __user *)arg);
2062                 free_async(as);
2063         } else {
2064                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2065         }
2066         return retval;
2067 }
2068
2069
2070 #endif
2071
2072 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2073 {
2074         struct usbdevfs_disconnectsignal ds;
2075
2076         if (copy_from_user(&ds, arg, sizeof(ds)))
2077                 return -EFAULT;
2078         ps->discsignr = ds.signr;
2079         ps->disccontext = ds.context;
2080         return 0;
2081 }
2082
2083 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2084 {
2085         unsigned int ifnum;
2086
2087         if (get_user(ifnum, (unsigned int __user *)arg))
2088                 return -EFAULT;
2089         return claimintf(ps, ifnum);
2090 }
2091
2092 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2093 {
2094         unsigned int ifnum;
2095         int ret;
2096
2097         if (get_user(ifnum, (unsigned int __user *)arg))
2098                 return -EFAULT;
2099         ret = releaseintf(ps, ifnum);
2100         if (ret < 0)
2101                 return ret;
2102         destroy_async_on_interface(ps, ifnum);
2103         return 0;
2104 }
2105
2106 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2107 {
2108         int                     size;
2109         void                    *buf = NULL;
2110         int                     retval = 0;
2111         struct usb_interface    *intf = NULL;
2112         struct usb_driver       *driver = NULL;
2113
2114         if (ps->privileges_dropped)
2115                 return -EACCES;
2116
2117         /* alloc buffer */
2118         size = _IOC_SIZE(ctl->ioctl_code);
2119         if (size > 0) {
2120                 buf = kmalloc(size, GFP_KERNEL);
2121                 if (buf == NULL)
2122                         return -ENOMEM;
2123                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2124                         if (copy_from_user(buf, ctl->data, size)) {
2125                                 kfree(buf);
2126                                 return -EFAULT;
2127                         }
2128                 } else {
2129                         memset(buf, 0, size);
2130                 }
2131         }
2132
2133         if (!connected(ps)) {
2134                 kfree(buf);
2135                 return -ENODEV;
2136         }
2137
2138         if (ps->dev->state != USB_STATE_CONFIGURED)
2139                 retval = -EHOSTUNREACH;
2140         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2141                 retval = -EINVAL;
2142         else switch (ctl->ioctl_code) {
2143
2144         /* disconnect kernel driver from interface */
2145         case USBDEVFS_DISCONNECT:
2146                 if (intf->dev.driver) {
2147                         driver = to_usb_driver(intf->dev.driver);
2148                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2149                         usb_driver_release_interface(driver, intf);
2150                 } else
2151                         retval = -ENODATA;
2152                 break;
2153
2154         /* let kernel drivers try to (re)bind to the interface */
2155         case USBDEVFS_CONNECT:
2156                 if (!intf->dev.driver)
2157                         retval = device_attach(&intf->dev);
2158                 else
2159                         retval = -EBUSY;
2160                 break;
2161
2162         /* talk directly to the interface's driver */
2163         default:
2164                 if (intf->dev.driver)
2165                         driver = to_usb_driver(intf->dev.driver);
2166                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2167                         retval = -ENOTTY;
2168                 } else {
2169                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2170                         if (retval == -ENOIOCTLCMD)
2171                                 retval = -ENOTTY;
2172                 }
2173         }
2174
2175         /* cleanup and return */
2176         if (retval >= 0
2177                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2178                         && size > 0
2179                         && copy_to_user(ctl->data, buf, size) != 0)
2180                 retval = -EFAULT;
2181
2182         kfree(buf);
2183         return retval;
2184 }
2185
2186 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2187 {
2188         struct usbdevfs_ioctl   ctrl;
2189
2190         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2191                 return -EFAULT;
2192         return proc_ioctl(ps, &ctrl);
2193 }
2194
2195 #ifdef CONFIG_COMPAT
2196 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2197 {
2198         struct usbdevfs_ioctl32 ioc32;
2199         struct usbdevfs_ioctl ctrl;
2200
2201         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2202                 return -EFAULT;
2203         ctrl.ifno = ioc32.ifno;
2204         ctrl.ioctl_code = ioc32.ioctl_code;
2205         ctrl.data = compat_ptr(ioc32.data);
2206         return proc_ioctl(ps, &ctrl);
2207 }
2208 #endif
2209
2210 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2211 {
2212         unsigned portnum;
2213         int rc;
2214
2215         if (get_user(portnum, (unsigned __user *) arg))
2216                 return -EFAULT;
2217         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2218         if (rc == 0)
2219                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2220                         portnum, task_pid_nr(current), current->comm);
2221         return rc;
2222 }
2223
2224 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2225 {
2226         unsigned portnum;
2227
2228         if (get_user(portnum, (unsigned __user *) arg))
2229                 return -EFAULT;
2230         return usb_hub_release_port(ps->dev, portnum, ps);
2231 }
2232
2233 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2234 {
2235         __u32 caps;
2236
2237         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2238                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2239                         USBDEVFS_CAP_DROP_PRIVILEGES;
2240         if (!ps->dev->bus->no_stop_on_short)
2241                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2242         if (ps->dev->bus->sg_tablesize)
2243                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2244
2245         if (put_user(caps, (__u32 __user *)arg))
2246                 return -EFAULT;
2247
2248         return 0;
2249 }
2250
2251 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2252 {
2253         struct usbdevfs_disconnect_claim dc;
2254         struct usb_interface *intf;
2255
2256         if (copy_from_user(&dc, arg, sizeof(dc)))
2257                 return -EFAULT;
2258
2259         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2260         if (!intf)
2261                 return -EINVAL;
2262
2263         if (intf->dev.driver) {
2264                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2265
2266                 if (ps->privileges_dropped)
2267                         return -EACCES;
2268
2269                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2270                                 strncmp(dc.driver, intf->dev.driver->name,
2271                                         sizeof(dc.driver)) != 0)
2272                         return -EBUSY;
2273
2274                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2275                                 strncmp(dc.driver, intf->dev.driver->name,
2276                                         sizeof(dc.driver)) == 0)
2277                         return -EBUSY;
2278
2279                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2280                 usb_driver_release_interface(driver, intf);
2281         }
2282
2283         return claimintf(ps, dc.interface);
2284 }
2285
2286 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2287 {
2288         unsigned num_streams, num_eps;
2289         struct usb_host_endpoint **eps;
2290         struct usb_interface *intf;
2291         int r;
2292
2293         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2294                                    &eps, &intf);
2295         if (r)
2296                 return r;
2297
2298         destroy_async_on_interface(ps,
2299                                    intf->altsetting[0].desc.bInterfaceNumber);
2300
2301         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2302         kfree(eps);
2303         return r;
2304 }
2305
2306 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2307 {
2308         unsigned num_eps;
2309         struct usb_host_endpoint **eps;
2310         struct usb_interface *intf;
2311         int r;
2312
2313         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2314         if (r)
2315                 return r;
2316
2317         destroy_async_on_interface(ps,
2318                                    intf->altsetting[0].desc.bInterfaceNumber);
2319
2320         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2321         kfree(eps);
2322         return r;
2323 }
2324
2325 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2326 {
2327         u32 data;
2328
2329         if (copy_from_user(&data, arg, sizeof(data)))
2330                 return -EFAULT;
2331
2332         /* This is a one way operation. Once privileges are
2333          * dropped, you cannot regain them. You may however reissue
2334          * this ioctl to shrink the allowed interfaces mask.
2335          */
2336         ps->interface_allowed_mask &= data;
2337         ps->privileges_dropped = true;
2338
2339         return 0;
2340 }
2341
2342 /*
2343  * NOTE:  All requests here that have interface numbers as parameters
2344  * are assuming that somehow the configuration has been prevented from
2345  * changing.  But there's no mechanism to ensure that...
2346  */
2347 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2348                                 void __user *p)
2349 {
2350         struct usb_dev_state *ps = file->private_data;
2351         struct inode *inode = file_inode(file);
2352         struct usb_device *dev = ps->dev;
2353         int ret = -ENOTTY;
2354
2355         if (!(file->f_mode & FMODE_WRITE))
2356                 return -EPERM;
2357
2358         usb_lock_device(dev);
2359
2360         /* Reap operations are allowed even after disconnection */
2361         switch (cmd) {
2362         case USBDEVFS_REAPURB:
2363                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2364                 ret = proc_reapurb(ps, p);
2365                 goto done;
2366
2367         case USBDEVFS_REAPURBNDELAY:
2368                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2369                 ret = proc_reapurbnonblock(ps, p);
2370                 goto done;
2371
2372 #ifdef CONFIG_COMPAT
2373         case USBDEVFS_REAPURB32:
2374                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2375                 ret = proc_reapurb_compat(ps, p);
2376                 goto done;
2377
2378         case USBDEVFS_REAPURBNDELAY32:
2379                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2380                 ret = proc_reapurbnonblock_compat(ps, p);
2381                 goto done;
2382 #endif
2383         }
2384
2385         if (!connected(ps)) {
2386                 usb_unlock_device(dev);
2387                 return -ENODEV;
2388         }
2389
2390         switch (cmd) {
2391         case USBDEVFS_CONTROL:
2392                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2393                 ret = proc_control(ps, p);
2394                 if (ret >= 0)
2395                         inode->i_mtime = current_time(inode);
2396                 break;
2397
2398         case USBDEVFS_BULK:
2399                 snoop(&dev->dev, "%s: BULK\n", __func__);
2400                 ret = proc_bulk(ps, p);
2401                 if (ret >= 0)
2402                         inode->i_mtime = current_time(inode);
2403                 break;
2404
2405         case USBDEVFS_RESETEP:
2406                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2407                 ret = proc_resetep(ps, p);
2408                 if (ret >= 0)
2409                         inode->i_mtime = current_time(inode);
2410                 break;
2411
2412         case USBDEVFS_RESET:
2413                 snoop(&dev->dev, "%s: RESET\n", __func__);
2414                 ret = proc_resetdevice(ps);
2415                 break;
2416
2417         case USBDEVFS_CLEAR_HALT:
2418                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2419                 ret = proc_clearhalt(ps, p);
2420                 if (ret >= 0)
2421                         inode->i_mtime = current_time(inode);
2422                 break;
2423
2424         case USBDEVFS_GETDRIVER:
2425                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2426                 ret = proc_getdriver(ps, p);
2427                 break;
2428
2429         case USBDEVFS_CONNECTINFO:
2430                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2431                 ret = proc_connectinfo(ps, p);
2432                 break;
2433
2434         case USBDEVFS_SETINTERFACE:
2435                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2436                 ret = proc_setintf(ps, p);
2437                 break;
2438
2439         case USBDEVFS_SETCONFIGURATION:
2440                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2441                 ret = proc_setconfig(ps, p);
2442                 break;
2443
2444         case USBDEVFS_SUBMITURB:
2445                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2446                 ret = proc_submiturb(ps, p);
2447                 if (ret >= 0)
2448                         inode->i_mtime = current_time(inode);
2449                 break;
2450
2451 #ifdef CONFIG_COMPAT
2452         case USBDEVFS_CONTROL32:
2453                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2454                 ret = proc_control_compat(ps, p);
2455                 if (ret >= 0)
2456                         inode->i_mtime = current_time(inode);
2457                 break;
2458
2459         case USBDEVFS_BULK32:
2460                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2461                 ret = proc_bulk_compat(ps, p);
2462                 if (ret >= 0)
2463                         inode->i_mtime = current_time(inode);
2464                 break;
2465
2466         case USBDEVFS_DISCSIGNAL32:
2467                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2468                 ret = proc_disconnectsignal_compat(ps, p);
2469                 break;
2470
2471         case USBDEVFS_SUBMITURB32:
2472                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2473                 ret = proc_submiturb_compat(ps, p);
2474                 if (ret >= 0)
2475                         inode->i_mtime = current_time(inode);
2476                 break;
2477
2478         case USBDEVFS_IOCTL32:
2479                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2480                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2481                 break;
2482 #endif
2483
2484         case USBDEVFS_DISCARDURB:
2485                 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2486                 ret = proc_unlinkurb(ps, p);
2487                 break;
2488
2489         case USBDEVFS_DISCSIGNAL:
2490                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2491                 ret = proc_disconnectsignal(ps, p);
2492                 break;
2493
2494         case USBDEVFS_CLAIMINTERFACE:
2495                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2496                 ret = proc_claiminterface(ps, p);
2497                 break;
2498
2499         case USBDEVFS_RELEASEINTERFACE:
2500                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2501                 ret = proc_releaseinterface(ps, p);
2502                 break;
2503
2504         case USBDEVFS_IOCTL:
2505                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2506                 ret = proc_ioctl_default(ps, p);
2507                 break;
2508
2509         case USBDEVFS_CLAIM_PORT:
2510                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2511                 ret = proc_claim_port(ps, p);
2512                 break;
2513
2514         case USBDEVFS_RELEASE_PORT:
2515                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2516                 ret = proc_release_port(ps, p);
2517                 break;
2518         case USBDEVFS_GET_CAPABILITIES:
2519                 ret = proc_get_capabilities(ps, p);
2520                 break;
2521         case USBDEVFS_DISCONNECT_CLAIM:
2522                 ret = proc_disconnect_claim(ps, p);
2523                 break;
2524         case USBDEVFS_ALLOC_STREAMS:
2525                 ret = proc_alloc_streams(ps, p);
2526                 break;
2527         case USBDEVFS_FREE_STREAMS:
2528                 ret = proc_free_streams(ps, p);
2529                 break;
2530         case USBDEVFS_DROP_PRIVILEGES:
2531                 ret = proc_drop_privileges(ps, p);
2532                 break;
2533         case USBDEVFS_GET_SPEED:
2534                 ret = ps->dev->speed;
2535                 break;
2536         }
2537
2538  done:
2539         usb_unlock_device(dev);
2540         if (ret >= 0)
2541                 inode->i_atime = current_time(inode);
2542         return ret;
2543 }
2544
2545 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2546                         unsigned long arg)
2547 {
2548         int ret;
2549
2550         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2551
2552         return ret;
2553 }
2554
2555 #ifdef CONFIG_COMPAT
2556 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2557                         unsigned long arg)
2558 {
2559         int ret;
2560
2561         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2562
2563         return ret;
2564 }
2565 #endif
2566
2567 /* No kernel lock - fine */
2568 static __poll_t usbdev_poll(struct file *file,
2569                                 struct poll_table_struct *wait)
2570 {
2571         struct usb_dev_state *ps = file->private_data;
2572         __poll_t mask = 0;
2573
2574         poll_wait(file, &ps->wait, wait);
2575         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2576                 mask |= EPOLLOUT | EPOLLWRNORM;
2577         if (!connected(ps))
2578                 mask |= EPOLLHUP;
2579         if (list_empty(&ps->list))
2580                 mask |= EPOLLERR;
2581         return mask;
2582 }
2583
2584 const struct file_operations usbdev_file_operations = {
2585         .owner =          THIS_MODULE,
2586         .llseek =         no_seek_end_llseek,
2587         .read =           usbdev_read,
2588         .poll =           usbdev_poll,
2589         .unlocked_ioctl = usbdev_ioctl,
2590 #ifdef CONFIG_COMPAT
2591         .compat_ioctl =   usbdev_compat_ioctl,
2592 #endif
2593         .mmap =           usbdev_mmap,
2594         .open =           usbdev_open,
2595         .release =        usbdev_release,
2596 };
2597
2598 static void usbdev_remove(struct usb_device *udev)
2599 {
2600         struct usb_dev_state *ps;
2601         struct siginfo sinfo;
2602
2603         while (!list_empty(&udev->filelist)) {
2604                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2605                 destroy_all_async(ps);
2606                 wake_up_all(&ps->wait);
2607                 list_del_init(&ps->list);
2608                 if (ps->discsignr) {
2609                         clear_siginfo(&sinfo);
2610                         sinfo.si_signo = ps->discsignr;
2611                         sinfo.si_errno = EPIPE;
2612                         sinfo.si_code = SI_ASYNCIO;
2613                         sinfo.si_addr = ps->disccontext;
2614                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2615                                         ps->disc_pid, ps->cred);
2616                 }
2617         }
2618 }
2619
2620 static int usbdev_notify(struct notifier_block *self,
2621                                unsigned long action, void *dev)
2622 {
2623         switch (action) {
2624         case USB_DEVICE_ADD:
2625                 break;
2626         case USB_DEVICE_REMOVE:
2627                 usbdev_remove(dev);
2628                 break;
2629         }
2630         return NOTIFY_OK;
2631 }
2632
2633 static struct notifier_block usbdev_nb = {
2634         .notifier_call =        usbdev_notify,
2635 };
2636
2637 static struct cdev usb_device_cdev;
2638
2639 int __init usb_devio_init(void)
2640 {
2641         int retval;
2642
2643         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2644                                         "usb_device");
2645         if (retval) {
2646                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2647                 goto out;
2648         }
2649         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2650         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2651         if (retval) {
2652                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2653                        USB_DEVICE_MAJOR);
2654                 goto error_cdev;
2655         }
2656         usb_register_notify(&usbdev_nb);
2657 out:
2658         return retval;
2659
2660 error_cdev:
2661         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2662         goto out;
2663 }
2664
2665 void usb_devio_cleanup(void)
2666 {
2667         usb_unregister_notify(&usbdev_nb);
2668         cdev_del(&usb_device_cdev);
2669         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2670 }