drivers/usb/storage/uas.c

   1 /*
   2  * USB Attached SCSI
   3  * Note that this is not the same as the USB Mass Storage driver
   4  *
   5  * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2014
   6  * Copyright Matthew Wilcox for Intel Corp, 2010
   7  * Copyright Sarah Sharp for Intel Corp, 2010
   8  *
   9  * Distributed under the terms of the GNU GPL, version two.
  10  */
  11
  12 #include <linux/blkdev.h>
  13 #include <linux/slab.h>
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb_usual.h>
  18 #include <linux/usb/hcd.h>
  19 #include <linux/usb/storage.h>
  20 #include <linux/usb/uas.h>
  21
  22 #include <scsi/scsi.h>
  23 #include <scsi/scsi_eh.h>
  24 #include <scsi/scsi_dbg.h>
  25 #include <scsi/scsi_cmnd.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_tcq.h>
  29
  30 #include "uas-detect.h"
  31 #include "scsiglue.h"
  32
  33 #define MAX_CMNDS 256
  34
  35 struct uas_dev_info {
  36         struct usb_interface *intf;
  37         struct usb_device *udev;
  38         struct usb_anchor cmd_urbs;
  39         struct usb_anchor sense_urbs;
  40         struct usb_anchor data_urbs;
  41         unsigned long flags;
  42         int qdepth, resetting;
  43         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  44         unsigned use_streams:1;
  45         unsigned shutdown:1;
  46         struct scsi_cmnd *cmnd[MAX_CMNDS];
  47         spinlock_t lock;
  48         struct work_struct work;
  49 };
  50
  51 enum {
  52         SUBMIT_STATUS_URB       = (1 << 1),
  53         ALLOC_DATA_IN_URB       = (1 << 2),
  54         SUBMIT_DATA_IN_URB      = (1 << 3),
  55         ALLOC_DATA_OUT_URB      = (1 << 4),
  56         SUBMIT_DATA_OUT_URB     = (1 << 5),
  57         ALLOC_CMD_URB           = (1 << 6),
  58         SUBMIT_CMD_URB          = (1 << 7),
  59         COMMAND_INFLIGHT        = (1 << 8),
  60         DATA_IN_URB_INFLIGHT    = (1 << 9),
  61         DATA_OUT_URB_INFLIGHT   = (1 << 10),
  62         COMMAND_ABORTED         = (1 << 11),
  63         IS_IN_WORK_LIST         = (1 << 12),
  64 };
  65
  66 /* Overrides scsi_pointer */
  67 struct uas_cmd_info {
  68         unsigned int state;
  69         unsigned int stream;
  70         struct urb *cmd_urb;
  71         struct urb *data_in_urb;
  72         struct urb *data_out_urb;
  73 };
  74
  75 /* I hate forward declarations, but I actually have a loop */
  76 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  77                                 struct uas_dev_info *devinfo, gfp_t gfp);
  78 static void uas_do_work(struct work_struct *work);
  79 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  80 static void uas_free_streams(struct uas_dev_info *devinfo);
  81 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
  82                                 int status);
  83
  84 static void uas_do_work(struct work_struct *work)
  85 {
  86         struct uas_dev_info *devinfo =
  87                 container_of(work, struct uas_dev_info, work);
  88         struct uas_cmd_info *cmdinfo;
  89         struct scsi_cmnd *cmnd;
  90         unsigned long flags;
  91         int i, err;
  92
  93         spin_lock_irqsave(&devinfo->lock, flags);
  94
  95         if (devinfo->resetting)
  96                 goto out;
  97
  98         for (i = 0; i < devinfo->qdepth; i++) {
  99                 if (!devinfo->cmnd[i])
 100                         continue;
 101
 102                 cmnd = devinfo->cmnd[i];
 103                 cmdinfo = (void *)&cmnd->SCp;
 104
 105                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 106                         continue;
 107
 108                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 109                 if (!err)
 110                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 111                 else
 112                         schedule_work(&devinfo->work);
 113         }
 114 out:
 115         spin_unlock_irqrestore(&devinfo->lock, flags);
 116 }
 117
 118 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 119 {
 120         struct scsi_pointer *scp = (void *)cmdinfo;
 121         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 122         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 123
 124         lockdep_assert_held(&devinfo->lock);
 125         cmdinfo->state |= IS_IN_WORK_LIST;
 126         schedule_work(&devinfo->work);
 127 }
 128
 129 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
 130 {
 131         struct uas_cmd_info *cmdinfo;
 132         struct scsi_cmnd *cmnd;
 133         unsigned long flags;
 134         int i, err;
 135
 136         spin_lock_irqsave(&devinfo->lock, flags);
 137         for (i = 0; i < devinfo->qdepth; i++) {
 138                 if (!devinfo->cmnd[i])
 139                         continue;
 140
 141                 cmnd = devinfo->cmnd[i];
 142                 cmdinfo = (void *)&cmnd->SCp;
 143                 uas_log_cmd_state(cmnd, __func__, 0);
 144                 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
 145                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 146                 cmnd->result = result << 16;
 147                 err = uas_try_complete(cmnd, __func__);
 148                 WARN_ON(err != 0);
 149         }
 150         spin_unlock_irqrestore(&devinfo->lock, flags);
 151 }
 152
 153 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 154 {
 155         struct sense_iu *sense_iu = urb->transfer_buffer;
 156         struct scsi_device *sdev = cmnd->device;
 157
 158         if (urb->actual_length > 16) {
 159                 unsigned len = be16_to_cpup(&sense_iu->len);
 160                 if (len + 16 != urb->actual_length) {
 161                         int newlen = min(len + 16, urb->actual_length) - 16;
 162                         if (newlen < 0)
 163                                 newlen = 0;
 164                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 165                                 "disagrees with IU sense data length %d, "
 166                                 "using %d bytes of sense data\n", __func__,
 167                                         urb->actual_length, len, newlen);
 168                         len = newlen;
 169                 }
 170                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 171         }
 172
 173         cmnd->result = sense_iu->status;
 174 }
 175
 176 /*
 177  * scsi-tags go from 0 - (nr_tags - 1), uas tags need to match stream-ids,
 178  * which go from 1 - nr_streams. And we use 1 for untagged commands.
 179  */
 180 static int uas_get_tag(struct scsi_cmnd *cmnd)
 181 {
 182         int tag;
 183
 184         if (cmnd->flags & SCMD_TAGGED)
 185                 tag = cmnd->request->tag + 2;
 186         else
 187                 tag = 1;
 188
 189         return tag;
 190 }
 191
 192 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
 193                               int status)
 194 {
 195         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 196
 197         scmd_printk(KERN_INFO, cmnd,
 198                     "%s %d tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
 199                     prefix, status, uas_get_tag(cmnd),
 200                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 201                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 202                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 203                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 204                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 205                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 206                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 207                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 208                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 209                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 210                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 211                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 212         scsi_print_command(cmnd);
 213 }
 214
 215 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
 216 {
 217         struct uas_cmd_info *cmdinfo;
 218
 219         if (!cmnd)
 220                 return;
 221
 222         cmdinfo = (void *)&cmnd->SCp;
 223
 224         if (cmdinfo->state & SUBMIT_CMD_URB)
 225                 usb_free_urb(cmdinfo->cmd_urb);
 226
 227         /* data urbs may have never gotten their submit flag set */
 228         if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
 229                 usb_free_urb(cmdinfo->data_in_urb);
 230         if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
 231                 usb_free_urb(cmdinfo->data_out_urb);
 232 }
 233
 234 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 235 {
 236         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 237         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 238
 239         lockdep_assert_held(&devinfo->lock);
 240         if (cmdinfo->state & (COMMAND_INFLIGHT |
 241                               DATA_IN_URB_INFLIGHT |
 242                               DATA_OUT_URB_INFLIGHT |
 243                               COMMAND_ABORTED))
 244                 return -EBUSY;
 245         devinfo->cmnd[uas_get_tag(cmnd) - 1] = NULL;
 246         uas_free_unsubmitted_urbs(cmnd);
 247         cmnd->scsi_done(cmnd);
 248         return 0;
 249 }
 250
 251 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 252                           unsigned direction)
 253 {
 254         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 255         int err;
 256
 257         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 258         err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 259         if (err) {
 260                 uas_add_work(cmdinfo);
 261         }
 262 }
 263
 264 static void uas_stat_cmplt(struct urb *urb)
 265 {
 266         struct iu *iu = urb->transfer_buffer;
 267         struct Scsi_Host *shost = urb->context;
 268         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 269         struct urb *data_in_urb = NULL;
 270         struct urb *data_out_urb = NULL;
 271         struct scsi_cmnd *cmnd;
 272         struct uas_cmd_info *cmdinfo;
 273         unsigned long flags;
 274         unsigned int idx;
 275
 276         spin_lock_irqsave(&devinfo->lock, flags);
 277
 278         if (devinfo->resetting)
 279                 goto out;
 280
 281         if (urb->status) {
 282                 if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
 283                         dev_err(&urb->dev->dev, "stat urb: status %d\n",
 284                                 urb->status);
 285                 }
 286                 goto out;
 287         }
 288
 289         idx = be16_to_cpup(&iu->tag) - 1;
 290         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
 291                 dev_err(&urb->dev->dev,
 292                         "stat urb: no pending cmd for tag %d\n", idx + 1);
 293                 goto out;
 294         }
 295
 296         cmnd = devinfo->cmnd[idx];
 297         cmdinfo = (void *)&cmnd->SCp;
 298
 299         if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
 300                 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
 301                 goto out;
 302         }
 303
 304         switch (iu->iu_id) {
 305         case IU_ID_STATUS:
 306                 uas_sense(urb, cmnd);
 307                 if (cmnd->result != 0) {
 308                         /* cancel data transfers on error */
 309                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 310                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 311                 }
 312                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 313                 uas_try_complete(cmnd, __func__);
 314                 break;
 315         case IU_ID_READ_READY:
 316                 if (!cmdinfo->data_in_urb ||
 317                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 318                         uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
 319                         break;
 320                 }
 321                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 322                 break;
 323         case IU_ID_WRITE_READY:
 324                 if (!cmdinfo->data_out_urb ||
 325                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 326                         uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
 327                         break;
 328                 }
 329                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 330                 break;
 331         case IU_ID_RESPONSE:
 332                 uas_log_cmd_state(cmnd, "unexpected response iu",
 333                                   ((struct response_iu *)iu)->response_code);
 334                 /* Error, cancel data transfers */
 335                 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 336                 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 337                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 338                 cmnd->result = DID_ERROR << 16;
 339                 uas_try_complete(cmnd, __func__);
 340                 break;
 341         default:
 342                 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
 343         }
 344 out:
 345         usb_free_urb(urb);
 346         spin_unlock_irqrestore(&devinfo->lock, flags);
 347
 348         /* Unlinking of data urbs must be done without holding the lock */
 349         if (data_in_urb) {
 350                 usb_unlink_urb(data_in_urb);
 351                 usb_put_urb(data_in_urb);
 352         }
 353         if (data_out_urb) {
 354                 usb_unlink_urb(data_out_urb);
 355                 usb_put_urb(data_out_urb);
 356         }
 357 }
 358
 359 static void uas_data_cmplt(struct urb *urb)
 360 {
 361         struct scsi_cmnd *cmnd = urb->context;
 362         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 363         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 364         struct scsi_data_buffer *sdb = NULL;
 365         unsigned long flags;
 366
 367         spin_lock_irqsave(&devinfo->lock, flags);
 368
 369         if (cmdinfo->data_in_urb == urb) {
 370                 sdb = scsi_in(cmnd);
 371                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 372                 cmdinfo->data_in_urb = NULL;
 373         } else if (cmdinfo->data_out_urb == urb) {
 374                 sdb = scsi_out(cmnd);
 375                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 376                 cmdinfo->data_out_urb = NULL;
 377         }
 378         if (sdb == NULL) {
 379                 WARN_ON_ONCE(1);
 380                 goto out;
 381         }
 382
 383         if (devinfo->resetting)
 384                 goto out;
 385
 386         /* Data urbs should not complete before the cmd urb is submitted */
 387         if (cmdinfo->state & SUBMIT_CMD_URB) {
 388                 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
 389                 goto out;
 390         }
 391
 392         if (urb->status) {
 393                 if (urb->status != -ENOENT && urb->status != -ECONNRESET)
 394                         uas_log_cmd_state(cmnd, "data cmplt err", urb->status);
 395                 /* error: no data transfered */
 396                 sdb->resid = sdb->length;
 397         } else {
 398                 sdb->resid = sdb->length - urb->actual_length;
 399         }
 400         uas_try_complete(cmnd, __func__);
 401 out:
 402         usb_free_urb(urb);
 403         spin_unlock_irqrestore(&devinfo->lock, flags);
 404 }
 405
 406 static void uas_cmd_cmplt(struct urb *urb)
 407 {
 408         if (urb->status)
 409                 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
 410
 411         usb_free_urb(urb);
 412 }
 413
 414 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 415                                       struct scsi_cmnd *cmnd,
 416                                       enum dma_data_direction dir)
 417 {
 418         struct usb_device *udev = devinfo->udev;
 419         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 420         struct urb *urb = usb_alloc_urb(0, gfp);
 421         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
 422                 ? scsi_in(cmnd) : scsi_out(cmnd);
 423         unsigned int pipe = (dir == DMA_FROM_DEVICE)
 424                 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
 425
 426         if (!urb)
 427                 goto out;
 428         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 429                           uas_data_cmplt, cmnd);
 430         urb->stream_id = cmdinfo->stream;
 431         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 432         urb->sg = sdb->table.sgl;
 433  out:
 434         return urb;
 435 }
 436
 437 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 438                                        struct scsi_cmnd *cmnd)
 439 {
 440         struct usb_device *udev = devinfo->udev;
 441         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 442         struct urb *urb = usb_alloc_urb(0, gfp);
 443         struct sense_iu *iu;
 444
 445         if (!urb)
 446                 goto out;
 447
 448         iu = kzalloc(sizeof(*iu), gfp);
 449         if (!iu)
 450                 goto free;
 451
 452         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 453                           uas_stat_cmplt, cmnd->device->host);
 454         urb->stream_id = cmdinfo->stream;
 455         urb->transfer_flags |= URB_FREE_BUFFER;
 456  out:
 457         return urb;
 458  free:
 459         usb_free_urb(urb);
 460         return NULL;
 461 }
 462
 463 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 464                                         struct scsi_cmnd *cmnd)
 465 {
 466         struct usb_device *udev = devinfo->udev;
 467         struct scsi_device *sdev = cmnd->device;
 468         struct urb *urb = usb_alloc_urb(0, gfp);
 469         struct command_iu *iu;
 470         int len;
 471
 472         if (!urb)
 473                 goto out;
 474
 475         len = cmnd->cmd_len - 16;
 476         if (len < 0)
 477                 len = 0;
 478         len = ALIGN(len, 4);
 479         iu = kzalloc(sizeof(*iu) + len, gfp);
 480         if (!iu)
 481                 goto free;
 482
 483         iu->iu_id = IU_ID_COMMAND;
 484         iu->tag = cpu_to_be16(uas_get_tag(cmnd));
 485         iu->prio_attr = UAS_SIMPLE_TAG;
 486         iu->len = len;
 487         int_to_scsilun(sdev->lun, &iu->lun);
 488         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 489
 490         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 491                                                         uas_cmd_cmplt, NULL);
 492         urb->transfer_flags |= URB_FREE_BUFFER;
 493  out:
 494         return urb;
 495  free:
 496         usb_free_urb(urb);
 497         return NULL;
 498 }
 499
 500 /*
 501  * Why should I request the Status IU before sending the Command IU?  Spec
 502  * says to, but also says the device may receive them in any order.  Seems
 503  * daft to me.
 504  */
 505
 506 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
 507 {
 508         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 509         struct urb *urb;
 510         int err;
 511
 512         urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
 513         if (!urb)
 514                 return NULL;
 515         usb_anchor_urb(urb, &devinfo->sense_urbs);
 516         err = usb_submit_urb(urb, gfp);
 517         if (err) {
 518                 usb_unanchor_urb(urb);
 519                 uas_log_cmd_state(cmnd, "sense submit err", err);
 520                 usb_free_urb(urb);
 521                 return NULL;
 522         }
 523         return urb;
 524 }
 525
 526 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 527                            struct uas_dev_info *devinfo, gfp_t gfp)
 528 {
 529         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 530         struct urb *urb;
 531         int err;
 532
 533         lockdep_assert_held(&devinfo->lock);
 534         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 535                 urb = uas_submit_sense_urb(cmnd, gfp);
 536                 if (!urb)
 537                         return SCSI_MLQUEUE_DEVICE_BUSY;
 538                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 539         }
 540
 541         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 542                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
 543                                                         cmnd, DMA_FROM_DEVICE);
 544                 if (!cmdinfo->data_in_urb)
 545                         return SCSI_MLQUEUE_DEVICE_BUSY;
 546                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 547         }
 548
 549         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 550                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 551                 err = usb_submit_urb(cmdinfo->data_in_urb, gfp);
 552                 if (err) {
 553                         usb_unanchor_urb(cmdinfo->data_in_urb);
 554                         uas_log_cmd_state(cmnd, "data in submit err", err);
 555                         return SCSI_MLQUEUE_DEVICE_BUSY;
 556                 }
 557                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 558                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 559         }
 560
 561         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 562                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
 563                                                         cmnd, DMA_TO_DEVICE);
 564                 if (!cmdinfo->data_out_urb)
 565                         return SCSI_MLQUEUE_DEVICE_BUSY;
 566                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 567         }
 568
 569         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 570                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 571                 err = usb_submit_urb(cmdinfo->data_out_urb, gfp);
 572                 if (err) {
 573                         usb_unanchor_urb(cmdinfo->data_out_urb);
 574                         uas_log_cmd_state(cmnd, "data out submit err", err);
 575                         return SCSI_MLQUEUE_DEVICE_BUSY;
 576                 }
 577                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 578                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 579         }
 580
 581         if (cmdinfo->state & ALLOC_CMD_URB) {
 582                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd);
 583                 if (!cmdinfo->cmd_urb)
 584                         return SCSI_MLQUEUE_DEVICE_BUSY;
 585                 cmdinfo->state &= ~ALLOC_CMD_URB;
 586         }
 587
 588         if (cmdinfo->state & SUBMIT_CMD_URB) {
 589                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 590                 err = usb_submit_urb(cmdinfo->cmd_urb, gfp);
 591                 if (err) {
 592                         usb_unanchor_urb(cmdinfo->cmd_urb);
 593                         uas_log_cmd_state(cmnd, "cmd submit err", err);
 594                         return SCSI_MLQUEUE_DEVICE_BUSY;
 595                 }
 596                 cmdinfo->cmd_urb = NULL;
 597                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 598                 cmdinfo->state |= COMMAND_INFLIGHT;
 599         }
 600
 601         return 0;
 602 }
 603
 604 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 605                                         void (*done)(struct scsi_cmnd *))
 606 {
 607         struct scsi_device *sdev = cmnd->device;
 608         struct uas_dev_info *devinfo = sdev->hostdata;
 609         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 610         unsigned long flags;
 611         unsigned int stream;
 612         int err;
 613
 614         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 615
 616         /* Re-check scsi_block_requests now that we've the host-lock */
 617         if (cmnd->device->host->host_self_blocked)
 618                 return SCSI_MLQUEUE_DEVICE_BUSY;
 619
 620         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 621                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 622                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 623                        sizeof(usb_stor_sense_invalidCDB));
 624                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 625                 cmnd->scsi_done(cmnd);
 626                 return 0;
 627         }
 628
 629         spin_lock_irqsave(&devinfo->lock, flags);
 630
 631         if (devinfo->resetting) {
 632                 cmnd->result = DID_ERROR << 16;
 633                 cmnd->scsi_done(cmnd);
 634                 spin_unlock_irqrestore(&devinfo->lock, flags);
 635                 return 0;
 636         }
 637
 638         stream = uas_get_tag(cmnd);
 639         if (devinfo->cmnd[stream - 1]) {
 640                 spin_unlock_irqrestore(&devinfo->lock, flags);
 641                 return SCSI_MLQUEUE_DEVICE_BUSY;
 642         }
 643
 644         cmnd->scsi_done = done;
 645
 646         memset(cmdinfo, 0, sizeof(*cmdinfo));
 647         cmdinfo->stream = stream;
 648         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 649
 650         switch (cmnd->sc_data_direction) {
 651         case DMA_FROM_DEVICE:
 652                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 653                 break;
 654         case DMA_BIDIRECTIONAL:
 655                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 656         case DMA_TO_DEVICE:
 657                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 658         case DMA_NONE:
 659                 break;
 660         }
 661
 662         if (!devinfo->use_streams) {
 663                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 664                 cmdinfo->stream = 0;
 665         }
 666
 667         err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
 668         if (err) {
 669                 /* If we did nothing, give up now */
 670                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 671                         spin_unlock_irqrestore(&devinfo->lock, flags);
 672                         return SCSI_MLQUEUE_DEVICE_BUSY;
 673                 }
 674                 uas_add_work(cmdinfo);
 675         }
 676
 677         devinfo->cmnd[stream - 1] = cmnd;
 678         spin_unlock_irqrestore(&devinfo->lock, flags);
 679         return 0;
 680 }
 681
 682 static DEF_SCSI_QCMD(uas_queuecommand)
 683
 684 /*
 685  * For now we do not support actually sending an abort to the device, so
 686  * this eh always fails. Still we must define it to make sure that we've
 687  * dropped all references to the cmnd in question once this function exits.
 688  */
 689 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 690 {
 691         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 692         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 693         struct urb *data_in_urb = NULL;
 694         struct urb *data_out_urb = NULL;
 695         unsigned long flags;
 696
 697         spin_lock_irqsave(&devinfo->lock, flags);
 698
 699         uas_log_cmd_state(cmnd, __func__, 0);
 700
 701         /* Ensure that try_complete does not call scsi_done */
 702         cmdinfo->state |= COMMAND_ABORTED;
 703
 704         /* Drop all refs to this cmnd, kill data urbs to break their ref */
 705         devinfo->cmnd[uas_get_tag(cmnd) - 1] = NULL;
 706         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 707                 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 708         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 709                 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 710
 711         uas_free_unsubmitted_urbs(cmnd);
 712
 713         spin_unlock_irqrestore(&devinfo->lock, flags);
 714
 715         if (data_in_urb) {
 716                 usb_kill_urb(data_in_urb);
 717                 usb_put_urb(data_in_urb);
 718         }
 719         if (data_out_urb) {
 720                 usb_kill_urb(data_out_urb);
 721                 usb_put_urb(data_out_urb);
 722         }
 723
 724         return FAILED;
 725 }
 726
 727 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
 728 {
 729         struct scsi_device *sdev = cmnd->device;
 730         struct uas_dev_info *devinfo = sdev->hostdata;
 731         struct usb_device *udev = devinfo->udev;
 732         unsigned long flags;
 733         int err;
 734
 735         err = usb_lock_device_for_reset(udev, devinfo->intf);
 736         if (err) {
 737                 shost_printk(KERN_ERR, sdev->host,
 738                              "%s FAILED to get lock err %d\n", __func__, err);
 739                 return FAILED;
 740         }
 741
 742         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 743
 744         spin_lock_irqsave(&devinfo->lock, flags);
 745         devinfo->resetting = 1;
 746         spin_unlock_irqrestore(&devinfo->lock, flags);
 747
 748         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 749         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 750         usb_kill_anchored_urbs(&devinfo->data_urbs);
 751         uas_zap_pending(devinfo, DID_RESET);
 752
 753         err = usb_reset_device(udev);
 754
 755         spin_lock_irqsave(&devinfo->lock, flags);
 756         devinfo->resetting = 0;
 757         spin_unlock_irqrestore(&devinfo->lock, flags);
 758
 759         usb_unlock_device(udev);
 760
 761         if (err) {
 762                 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
 763                              __func__, err);
 764                 return FAILED;
 765         }
 766
 767         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 768         return SUCCESS;
 769 }
 770
 771 static int uas_slave_alloc(struct scsi_device *sdev)
 772 {
 773         sdev->hostdata = (void *)sdev->host->hostdata;
 774
 775         /* USB has unusual DMA-alignment requirements: Although the
 776          * starting address of each scatter-gather element doesn't matter,
 777          * the length of each element except the last must be divisible
 778          * by the Bulk maxpacket value.  There's currently no way to
 779          * express this by block-layer constraints, so we'll cop out
 780          * and simply require addresses to be aligned at 512-byte
 781          * boundaries.  This is okay since most block I/O involves
 782          * hardware sectors that are multiples of 512 bytes in length,
 783          * and since host controllers up through USB 2.0 have maxpacket
 784          * values no larger than 512.
 785          *
 786          * But it doesn't suffice for Wireless USB, where Bulk maxpacket
 787          * values can be as large as 2048.  To make that work properly
 788          * will require changes to the block layer.
 789          */
 790         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
 791
 792         return 0;
 793 }
 794
 795 static int uas_slave_configure(struct scsi_device *sdev)
 796 {
 797         struct uas_dev_info *devinfo = sdev->hostdata;
 798
 799         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 800                 sdev->no_report_opcodes = 1;
 801
 802         scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
 803         return 0;
 804 }
 805
 806 static struct scsi_host_template uas_host_template = {
 807         .module = THIS_MODULE,
 808         .name = "uas",
 809         .queuecommand = uas_queuecommand,
 810         .slave_alloc = uas_slave_alloc,
 811         .slave_configure = uas_slave_configure,
 812         .eh_abort_handler = uas_eh_abort_handler,
 813         .eh_bus_reset_handler = uas_eh_bus_reset_handler,
 814         .can_queue = 65536,     /* Is there a limit on the _host_ ? */
 815         .this_id = -1,
 816         .sg_tablesize = SG_NONE,
 817         .cmd_per_lun = 1,       /* until we override it */
 818         .skip_settle_delay = 1,
 819
 820         /*
 821          * The uas drivers expects tags not to be bigger than the maximum
 822          * per-device queue depth, which is not true with the blk-mq tag
 823          * allocator.
 824          */
 825         .disable_blk_mq = true,
 826         .use_blk_tags = 1,
 827 };
 828
 829 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 830                     vendorName, productName, useProtocol, useTransport, \
 831                     initFunction, flags) \
 832 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 833         .driver_info = (flags) }
 834
 835 static struct usb_device_id uas_usb_ids[] = {
 836 #       include "unusual_uas.h"
 837         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 838         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 839         { }
 840 };
 841 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 842
 843 #undef UNUSUAL_DEV
 844
 845 static int uas_switch_interface(struct usb_device *udev,
 846                                 struct usb_interface *intf)
 847 {
 848         int alt;
 849
 850         alt = uas_find_uas_alt_setting(intf);
 851         if (alt < 0)
 852                 return alt;
 853
 854         return usb_set_interface(udev,
 855                         intf->altsetting[0].desc.bInterfaceNumber, alt);
 856 }
 857
 858 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
 859 {
 860         struct usb_host_endpoint *eps[4] = { };
 861         struct usb_device *udev = devinfo->udev;
 862         int r;
 863
 864         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 865         if (r)
 866                 return r;
 867
 868         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 869                                             usb_endpoint_num(&eps[0]->desc));
 870         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 871                                             usb_endpoint_num(&eps[1]->desc));
 872         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 873                                             usb_endpoint_num(&eps[2]->desc));
 874         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 875                                             usb_endpoint_num(&eps[3]->desc));
 876
 877         if (udev->speed < USB_SPEED_SUPER) {
 878                 devinfo->qdepth = 32;
 879                 devinfo->use_streams = 0;
 880         } else {
 881                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 882                                                     3, MAX_CMNDS, GFP_NOIO);
 883                 if (devinfo->qdepth < 0)
 884                         return devinfo->qdepth;
 885                 devinfo->use_streams = 1;
 886         }
 887
 888         return 0;
 889 }
 890
 891 static void uas_free_streams(struct uas_dev_info *devinfo)
 892 {
 893         struct usb_device *udev = devinfo->udev;
 894         struct usb_host_endpoint *eps[3];
 895
 896         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 897         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 898         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 899         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 900 }
 901
 902 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 903 {
 904         int result = -ENOMEM;
 905         struct Scsi_Host *shost = NULL;
 906         struct uas_dev_info *devinfo;
 907         struct usb_device *udev = interface_to_usbdev(intf);
 908
 909         if (!uas_use_uas_driver(intf, id))
 910                 return -ENODEV;
 911
 912         if (uas_switch_interface(udev, intf))
 913                 return -ENODEV;
 914
 915         shost = scsi_host_alloc(&uas_host_template,
 916                                 sizeof(struct uas_dev_info));
 917         if (!shost)
 918                 goto set_alt0;
 919
 920         shost->max_cmd_len = 16 + 252;
 921         shost->max_id = 1;
 922         shost->max_lun = 256;
 923         shost->max_channel = 0;
 924         shost->sg_tablesize = udev->bus->sg_tablesize;
 925
 926         devinfo = (struct uas_dev_info *)shost->hostdata;
 927         devinfo->intf = intf;
 928         devinfo->udev = udev;
 929         devinfo->resetting = 0;
 930         devinfo->shutdown = 0;
 931         devinfo->flags = id->driver_info;
 932         usb_stor_adjust_quirks(udev, &devinfo->flags);
 933         init_usb_anchor(&devinfo->cmd_urbs);
 934         init_usb_anchor(&devinfo->sense_urbs);
 935         init_usb_anchor(&devinfo->data_urbs);
 936         spin_lock_init(&devinfo->lock);
 937         INIT_WORK(&devinfo->work, uas_do_work);
 938
 939         result = uas_configure_endpoints(devinfo);
 940         if (result)
 941                 goto set_alt0;
 942
 943         result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
 944         if (result)
 945                 goto free_streams;
 946
 947         usb_set_intfdata(intf, shost);
 948         result = scsi_add_host(shost, &intf->dev);
 949         if (result)
 950                 goto free_streams;
 951
 952         scsi_scan_host(shost);
 953         return result;
 954
 955 free_streams:
 956         uas_free_streams(devinfo);
 957         usb_set_intfdata(intf, NULL);
 958 set_alt0:
 959         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
 960         if (shost)
 961                 scsi_host_put(shost);
 962         return result;
 963 }
 964
 965 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
 966 {
 967         unsigned long flags;
 968         int i, r = 1;
 969
 970         spin_lock_irqsave(&devinfo->lock, flags);
 971
 972         for (i = 0; i < devinfo->qdepth; i++) {
 973                 if (devinfo->cmnd[i]) {
 974                         r = 0; /* Not empty */
 975                         break;
 976                 }
 977         }
 978
 979         spin_unlock_irqrestore(&devinfo->lock, flags);
 980
 981         return r;
 982 }
 983
 984 /*
 985  * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
 986  * get empty while there still is more work to do due to sense-urbs completing
 987  * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
 988  */
 989 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
 990 {
 991         unsigned long start_time;
 992         int r;
 993
 994         start_time = jiffies;
 995         do {
 996                 flush_work(&devinfo->work);
 997
 998                 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
 999                 if (r == 0)
1000                         return -ETIME;
1001
1002                 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1003                 if (r == 0)
1004                         return -ETIME;
1005
1006                 if (time_after(jiffies, start_time + 5 * HZ))
1007                         return -ETIME;
1008         } while (!uas_cmnd_list_empty(devinfo));
1009
1010         return 0;
1011 }
1012
1013 static int uas_pre_reset(struct usb_interface *intf)
1014 {
1015         struct Scsi_Host *shost = usb_get_intfdata(intf);
1016         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1017         unsigned long flags;
1018
1019         if (devinfo->shutdown)
1020                 return 0;
1021
1022         /* Block new requests */
1023         spin_lock_irqsave(shost->host_lock, flags);
1024         scsi_block_requests(shost);
1025         spin_unlock_irqrestore(shost->host_lock, flags);
1026
1027         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1028                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1029                 scsi_unblock_requests(shost);
1030                 return 1;
1031         }
1032
1033         uas_free_streams(devinfo);
1034
1035         return 0;
1036 }
1037
1038 static int uas_post_reset(struct usb_interface *intf)
1039 {
1040         struct Scsi_Host *shost = usb_get_intfdata(intf);
1041         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1042         unsigned long flags;
1043         int err;
1044
1045         if (devinfo->shutdown)
1046                 return 0;
1047
1048         err = uas_configure_endpoints(devinfo);
1049         if (err) {
1050                 shost_printk(KERN_ERR, shost,
1051                              "%s: alloc streams error %d after reset",
1052                              __func__, err);
1053                 return 1;
1054         }
1055
1056         spin_lock_irqsave(shost->host_lock, flags);
1057         scsi_report_bus_reset(shost, 0);
1058         spin_unlock_irqrestore(shost->host_lock, flags);
1059
1060         scsi_unblock_requests(shost);
1061
1062         return 0;
1063 }
1064
1065 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1066 {
1067         struct Scsi_Host *shost = usb_get_intfdata(intf);
1068         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1069
1070         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1071                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1072                 return -ETIME;
1073         }
1074
1075         return 0;
1076 }
1077
1078 static int uas_resume(struct usb_interface *intf)
1079 {
1080         return 0;
1081 }
1082
1083 static int uas_reset_resume(struct usb_interface *intf)
1084 {
1085         struct Scsi_Host *shost = usb_get_intfdata(intf);
1086         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1087         unsigned long flags;
1088         int err;
1089
1090         err = uas_configure_endpoints(devinfo);
1091         if (err) {
1092                 shost_printk(KERN_ERR, shost,
1093                              "%s: alloc streams error %d after reset",
1094                              __func__, err);
1095                 return -EIO;
1096         }
1097
1098         spin_lock_irqsave(shost->host_lock, flags);
1099         scsi_report_bus_reset(shost, 0);
1100         spin_unlock_irqrestore(shost->host_lock, flags);
1101
1102         return 0;
1103 }
1104
1105 static void uas_disconnect(struct usb_interface *intf)
1106 {
1107         struct Scsi_Host *shost = usb_get_intfdata(intf);
1108         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1109         unsigned long flags;
1110
1111         spin_lock_irqsave(&devinfo->lock, flags);
1112         devinfo->resetting = 1;
1113         spin_unlock_irqrestore(&devinfo->lock, flags);
1114
1115         cancel_work_sync(&devinfo->work);
1116         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1117         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1118         usb_kill_anchored_urbs(&devinfo->data_urbs);
1119         uas_zap_pending(devinfo, DID_NO_CONNECT);
1120
1121         scsi_remove_host(shost);
1122         uas_free_streams(devinfo);
1123         scsi_host_put(shost);
1124 }
1125
1126 /*
1127  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1128  * hang on reboot when the device is still in uas mode. Note the reset is
1129  * necessary as some devices won't revert to usb-storage mode without it.
1130  */
1131 static void uas_shutdown(struct device *dev)
1132 {
1133         struct usb_interface *intf = to_usb_interface(dev);
1134         struct usb_device *udev = interface_to_usbdev(intf);
1135         struct Scsi_Host *shost = usb_get_intfdata(intf);
1136         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1137
1138         if (system_state != SYSTEM_RESTART)
1139                 return;
1140
1141         devinfo->shutdown = 1;
1142         uas_free_streams(devinfo);
1143         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1144         usb_reset_device(udev);
1145 }
1146
1147 static struct usb_driver uas_driver = {
1148         .name = "uas",
1149         .probe = uas_probe,
1150         .disconnect = uas_disconnect,
1151         .pre_reset = uas_pre_reset,
1152         .post_reset = uas_post_reset,
1153         .suspend = uas_suspend,
1154         .resume = uas_resume,
1155         .reset_resume = uas_reset_resume,
1156         .drvwrap.driver.shutdown = uas_shutdown,
1157         .id_table = uas_usb_ids,
1158 };
1159
1160 module_usb_driver(uas_driver);
1161
1162 MODULE_LICENSE("GPL");
1163 MODULE_AUTHOR(
1164         "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");