projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / net / wanrouter / wanmain.c
CommitLineData
1da177e4
LT		 1/*****************************************************************************
2* wanmain.c WAN Multiprotocol Router Module. Main code.
3*
4* This module is completely hardware-independent and provides
5* the following common services for the WAN Link Drivers:
0779bf2d 6* o WAN device management (registering, unregistering)
1da177e4
LT		 7* o Network interface management
8* o Physical connection management (dial-up, incoming calls)
9* o Logical connection management (switched virtual circuits)
10* o Protocol encapsulation/decapsulation
11*
12* Author: Gideon Hack
13*
14* Copyright: (c) 1995-1999 Sangoma Technologies Inc.
15*
16* This program is free software; you can redistribute it and/or
17* modify it under the terms of the GNU General Public License
18* as published by the Free Software Foundation; either version
19* 2 of the License, or (at your option) any later version.
20* ============================================================================
21* Nov 24, 2000 Nenad Corbic Updated for 2.4.X kernels
22* Nov 07, 2000 Nenad Corbic Fixed the Mulit-Port PPP for kernels 2.2.16 and
23* greater.
24* Aug 2, 2000 Nenad Corbic Block the Multi-Port PPP from running on
25* kernels 2.2.16 or greater. The SyncPPP
26* has changed.
27* Jul 13, 2000 Nenad Corbic Added SyncPPP support
28* Added extra debugging in device_setup().
29* Oct 01, 1999 Gideon Hack Update for s514 PCI card
30* Dec 27, 1996 Gene Kozin Initial version (based on Sangoma's WANPIPE)
31* Jan 16, 1997 Gene Kozin router_devlist made public
32* Jan 31, 1997 Alan Cox Hacked it about a bit for 2.1
33* Jun 27, 1997 Alan Cox realigned with vendor code
34* Oct 15, 1997 Farhan Thawar changed wan_encapsulate to add a pad byte of 0
35* Apr 20, 1998 Alan Cox Fixed 2.1 symbols
36* May 17, 1998 K. Baranowski Fixed SNAP encapsulation in wan_encapsulate
37* Dec 15, 1998 Arnaldo Melo support for firmwares of up to 128000 bytes
38* check wandev->setup return value
39* Dec 22, 1998 Arnaldo Melo vmalloc/vfree used in device_setup to allocate
40* kernel memory and copy configuration data to
41* kernel space (for big firmwares)
42* Jun 02, 1999 Gideon Hack Updates for Linux 2.0.X and 2.2.X kernels.
43*****************************************************************************/
44
1da177e4 45#include <linux/stddef.h> /* offsetof(), etc. */
4fc268d2 46#include <linux/capability.h>
1da177e4
LT		 47#include <linux/errno.h> /* return codes */
48#include <linux/kernel.h>
1da177e4 49#include <linux/module.h> /* support for loadable modules */
e49332bd 50#include <linux/slab.h> /* kmalloc(), kfree() */
405f5571 51#include <linux/smp_lock.h>
e49332bd 52#include <linux/mm.h>
1da177e4
LT		 53#include <linux/string.h> /* inline mem*, str* functions */
54
55#include <asm/byteorder.h> /* htons(), etc. */
56#include <linux/wanrouter.h> /* WAN router API definitions */
57
58#include <linux/vmalloc.h> /* vmalloc, vfree */
59#include <asm/uaccess.h> /* copy_to/from_user */
60#include <linux/init.h> /* __initfunc et al. */
1da177e4
LT		 61
62#define KMEM_SAFETYZONE 8
63
7be6065b
WC		 64#define DEV_TO_SLAVE(dev) (*((struct net_device **)netdev_priv(dev)))
65
1da177e4
LT		 66/*
67 * Function Prototypes
68 */
69
70/*
71 * WAN device IOCTL handlers
72 */
73
74static int wanrouter_device_setup(struct wan_device *wandev,
75 wandev_conf_t __user *u_conf);
76static int wanrouter_device_stat(struct wan_device *wandev,
77 wandev_stat_t __user *u_stat);
78static int wanrouter_device_shutdown(struct wan_device *wandev);
79static int wanrouter_device_new_if(struct wan_device *wandev,
80 wanif_conf_t __user *u_conf);
81static int wanrouter_device_del_if(struct wan_device *wandev,
82 char __user *u_name);
83
84/*
85 * Miscellaneous
86 */
87
88static struct wan_device *wanrouter_find_device(char *name);
89static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
9ee62630
HE		 90static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
91 __acquires(lock);
92static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
93 __releases(lock);
1da177e4
LT		 94
95
96
97/*
98 * Global Data
99 */
100
101static char wanrouter_fullname[] = "Sangoma WANPIPE Router";
102static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
103static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
104struct wan_device* wanrouter_router_devlist; /* list of registered devices */
105
106/*
107 * Organize Unique Identifiers for encapsulation/decapsulation
108 */
109
1da177e4 110#if 0
97353cb4 111static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
1da177e4
LT		 112static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
113#endif
114
115static int __init wanrouter_init(void)
116{
117 int err;
118
119 printk(KERN_INFO "%s v%u.%u %s\n",
120 wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
121 wanrouter_copyright);
122
123 err = wanrouter_proc_init();
124 if (err)
125 printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
126 wanrouter_modname);
127
128 return err;
129}
130
131static void __exit wanrouter_cleanup (void)
132{
133 wanrouter_proc_cleanup();
134}
135
136/*
137 * This is just plain dumb. We should move the bugger to drivers/net/wan,
138 * slap it first in directory and make it module_init(). The only reason
139 * for subsys_initcall() here is that net goes after drivers (why, BTW?)
140 */
141subsys_initcall(wanrouter_init);
142module_exit(wanrouter_cleanup);
143
144/*
145 * Kernel APIs
146 */
147
148/*
149 * Register WAN device.
150 * o verify device credentials
151 * o create an entry for the device in the /proc/net/router directory
152 * o initialize internally maintained fields of the wan_device structure
153 * o link device data space to a singly-linked list
154 * o if it's the first device, then start kernel 'thread'
155 * o increment module use count
156 *
157 * Return:
158 * 0 Ok
159 * < 0 error.
160 *
161 * Context: process
162 */
163
164
165int register_wan_device(struct wan_device *wandev)
166{
167 int err, namelen;
168
169 if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
170 (wandev->name == NULL))
171 return -EINVAL;
172
173 namelen = strlen(wandev->name);
174 if (!namelen || (namelen > WAN_DRVNAME_SZ))
175 return -EINVAL;
176
177 if (wanrouter_find_device(wandev->name))
178 return -EEXIST;
179
180#ifdef WANDEBUG
181 printk(KERN_INFO "%s: registering WAN device %s\n",
182 wanrouter_modname, wandev->name);
183#endif
184
185 /*
186 * Register /proc directory entry
187 */
188 err = wanrouter_proc_add(wandev);
189 if (err) {
190 printk(KERN_INFO
191 "%s: can't create /proc/net/router/%s entry!\n",
192 wanrouter_modname, wandev->name);
193 return err;
194 }
195
196 /*
197 * Initialize fields of the wan_device structure maintained by the
198 * router and update local data.
199 */
200
201 wandev->ndev = 0;
202 wandev->dev = NULL;
203 wandev->next = wanrouter_router_devlist;
204 wanrouter_router_devlist = wandev;
205 return 0;
206}
207
208/*
209 * Unregister WAN device.
210 * o shut down device
211 * o unlink device data space from the linked list
212 * o delete device entry in the /proc/net/router directory
213 * o decrement module use count
214 *
215 * Return: 0 Ok
216 * <0 error.
217 * Context: process
218 */
219
220
221int unregister_wan_device(char *name)
222{
223 struct wan_device *wandev, *prev;
224
225 if (name == NULL)
226 return -EINVAL;
227
228 for (wandev = wanrouter_router_devlist, prev = NULL;
229 wandev && strcmp(wandev->name, name);
230 prev = wandev, wandev = wandev->next)
231 ;
232 if (wandev == NULL)
233 return -ENODEV;
234
235#ifdef WANDEBUG
236 printk(KERN_INFO "%s: unregistering WAN device %s\n",
237 wanrouter_modname, name);
238#endif
239
240 if (wandev->state != WAN_UNCONFIGURED)
241 wanrouter_device_shutdown(wandev);
242
243 if (prev)
244 prev->next = wandev->next;
245 else
246 wanrouter_router_devlist = wandev->next;
247
248 wanrouter_proc_delete(wandev);
249 return 0;
250}
251
97353cb4
AB		 252#if 0
253
1da177e4
LT		 254/*
255 * Encapsulate packet.
256 *
257 * Return: encapsulation header size
258 * < 0 - unsupported Ethertype
259 *
260 * Notes:
261 * 1. This function may be called on interrupt context.
262 */
263
264
265int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
266 unsigned short type)
267{
268 int hdr_len = 0;
269
270 switch (type) {
271 case ETH_P_IP: /* IP datagram encapsulation */
272 hdr_len += 1;
273 skb_push(skb, 1);
274 skb->data[0] = NLPID_IP;
275 break;
276
277 case ETH_P_IPX: /* SNAP encapsulation */
278 case ETH_P_ARP:
279 hdr_len += 7;
280 skb_push(skb, 7);
281 skb->data[0] = 0;
282 skb->data[1] = NLPID_SNAP;
27d7ff46
ACM		 283 skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether,
284 sizeof(wanrouter_oui_ether));
1da177e4
LT		 285 *((unsigned short*)&skb->data[5]) = htons(type);
286 break;
287
288 default: /* Unknown packet type */
289 printk(KERN_INFO
290 "%s: unsupported Ethertype 0x%04X on interface %s!\n",
291 wanrouter_modname, type, dev->name);
292 hdr_len = -EINVAL;
293 }
294 return hdr_len;
295}
296
297
298/*
299 * Decapsulate packet.
300 *
301 * Return: Ethertype (in network order)
302 * 0 unknown encapsulation
303 *
304 * Notes:
305 * 1. This function may be called on interrupt context.
306 */
307
308
ab611487 309__be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
1da177e4
LT		 310{
311 int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
ab611487 312 __be16 ethertype;
1da177e4
LT		 313
314 switch (skb->data[cnt]) {
315 case NLPID_IP: /* IP datagramm */
316 ethertype = htons(ETH_P_IP);
317 cnt += 1;
318 break;
319
4ba6122b 320 case NLPID_SNAP: /* SNAP encapsulation */
1da177e4
LT		 321 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
322 sizeof(wanrouter_oui_ether))){
4ba6122b 323 printk(KERN_INFO
1da177e4
LT		 324 "%s: unsupported SNAP OUI %02X-%02X-%02X "
325 "on interface %s!\n", wanrouter_modname,
326 skb->data[cnt+1], skb->data[cnt+2],
327 skb->data[cnt+3], dev->name);
328 return 0;
329 }
ab611487 330 ethertype = *((__be16*)&skb->data[cnt+4]);
1da177e4
LT		 331 cnt += 6;
332 break;
333
334 /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
335
336 default:
337 printk(KERN_INFO
338 "%s: unsupported NLPID 0x%02X on interface %s!\n",
339 wanrouter_modname, skb->data[cnt], dev->name);
340 return 0;
341 }
342 skb->protocol = ethertype;
343 skb->pkt_type = PACKET_HOST; /* Physically point to point */
344 skb_pull(skb, cnt);
459a98ed 345 skb_reset_mac_header(skb);
1da177e4
LT		 346 return ethertype;
347}
348
97353cb4 349#endif /* 0 */
1da177e4
LT		 350
351/*
352 * WAN device IOCTL.
353 * o find WAN device associated with this node
354 * o execute requested action or pass command to the device driver
355 */
356
866988ed 357long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4 358{
866988ed 359 struct inode *inode = file->f_path.dentry->d_inode;
1da177e4
LT		 360 int err = 0;
361 struct proc_dir_entry *dent;
362 struct wan_device *wandev;
363 void __user *data = (void __user *)arg;
364
365 if (!capable(CAP_NET_ADMIN))
366 return -EPERM;
367
368 if ((cmd >> 8) != ROUTER_IOCTL)
369 return -EINVAL;
370
371 dent = PDE(inode);
372 if ((dent == NULL) || (dent->data == NULL))
373 return -EINVAL;
374
375 wandev = dent->data;
376 if (wandev->magic != ROUTER_MAGIC)
377 return -EINVAL;
378
866988ed 379 lock_kernel();
1da177e4
LT		 380 switch (cmd) {
381 case ROUTER_SETUP:
382 err = wanrouter_device_setup(wandev, data);
383 break;
384
385 case ROUTER_DOWN:
386 err = wanrouter_device_shutdown(wandev);
387 break;
388
389 case ROUTER_STAT:
390 err = wanrouter_device_stat(wandev, data);
391 break;
392
393 case ROUTER_IFNEW:
394 err = wanrouter_device_new_if(wandev, data);
395 break;
396
397 case ROUTER_IFDEL:
398 err = wanrouter_device_del_if(wandev, data);
399 break;
400
401 case ROUTER_IFSTAT:
402 break;
403
404 default:
405 if ((cmd >= ROUTER_USER) &&
406 (cmd <= ROUTER_USER_MAX) &&
407 wandev->ioctl)
408 err = wandev->ioctl(wandev, cmd, arg);
409 else err = -EINVAL;
410 }
866988ed 411 unlock_kernel();
1da177e4
LT		 412 return err;
413}
414
415/*
416 * WAN Driver IOCTL Handlers
417 */
418
419/*
420 * Setup WAN link device.
421 * o verify user address space
422 * o allocate kernel memory and copy configuration data to kernel space
423 * o if configuration data includes extension, copy it to kernel space too
424 * o call driver's setup() entry point
425 */
426
427static int wanrouter_device_setup(struct wan_device *wandev,
428 wandev_conf_t __user *u_conf)
429{
430 void *data = NULL;
431 wandev_conf_t *conf;
432 int err = -EINVAL;
433
434 if (wandev->setup == NULL) { /* Nothing to do ? */
435 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
436 wandev->name);
437 return 0;
438 }
439
440 conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
441 if (conf == NULL){
442 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
443 wandev->name);
444 return -ENOBUFS;
445 }
446
447 if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
448 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
449 wandev->name);
450 kfree(conf);
451 return -EFAULT;
452 }
453
454 if (conf->magic != ROUTER_MAGIC) {
455 kfree(conf);
456 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
457 wandev->name);
4ba6122b 458 return -EINVAL;
1da177e4
LT		 459 }
460
461 if (conf->data_size && conf->data) {
75202e76 462 if (conf->data_size > 128000) {
1da177e4
LT		 463 printk(KERN_INFO
464 "%s: ERROR, Invalid firmware data size %i !\n",
465 wandev->name, conf->data_size);
466 kfree(conf);
4ba6122b 467 return -EINVAL;
1da177e4
LT		 468 }
469
470 data = vmalloc(conf->data_size);
471 if (!data) {
472 printk(KERN_INFO
4ba6122b 473 "%s: ERROR, Faild allocate kernel memory !\n",
1da177e4
LT		 474 wandev->name);
475 kfree(conf);
476 return -ENOBUFS;
477 }
478 if (!copy_from_user(data, conf->data, conf->data_size)) {
479 conf->data = data;
480 err = wandev->setup(wandev, conf);
481 } else {
482 printk(KERN_INFO
483 "%s: ERROR, Faild to copy from user data !\n",
484 wandev->name);
485 err = -EFAULT;
486 }
487 vfree(data);
488 } else {
489 printk(KERN_INFO
490 "%s: ERROR, No firmware found ! Firmware size = %i !\n",
491 wandev->name, conf->data_size);
492 }
493
494 kfree(conf);
495 return err;
496}
497
498/*
499 * Shutdown WAN device.
500 * o delete all not opened logical channels for this device
501 * o call driver's shutdown() entry point
502 */
503
504static int wanrouter_device_shutdown(struct wan_device *wandev)
505{
506 struct net_device *dev;
507 int err=0;
508
509 if (wandev->state == WAN_UNCONFIGURED)
510 return 0;
511
512 printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
513
514 for (dev = wandev->dev; dev;) {
515 err = wanrouter_delete_interface(wandev, dev->name);
516 if (err)
517 return err;
518 /* The above function deallocates the current dev
7be6065b 519 * structure. Therefore, we cannot use netdev_priv(dev)
1da177e4
LT		 520 * as the next element: wandev->dev points to the
521 * next element */
522 dev = wandev->dev;
523 }
524
525 if (wandev->ndev)
526 return -EBUSY; /* there are opened interfaces */
527
528 if (wandev->shutdown)
529 err=wandev->shutdown(wandev);
530
531 return err;
532}
533
534/*
535 * Get WAN device status & statistics.
536 */
537
538static int wanrouter_device_stat(struct wan_device *wandev,
539 wandev_stat_t __user *u_stat)
540{
541 wandev_stat_t stat;
542
543 memset(&stat, 0, sizeof(stat));
544
545 /* Ask device driver to update device statistics */
546 if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
547 wandev->update(wandev);
548
549 /* Fill out structure */
550 stat.ndev = wandev->ndev;
551 stat.state = wandev->state;
552
553 if (copy_to_user(u_stat, &stat, sizeof(stat)))
554 return -EFAULT;
555
556 return 0;
557}
558
559/*
560 * Create new WAN interface.
561 * o verify user address space
562 * o copy configuration data to kernel address space
563 * o allocate network interface data space
564 * o call driver's new_if() entry point
565 * o make sure there is no interface name conflict
566 * o register network interface
567 */
568
569static int wanrouter_device_new_if(struct wan_device *wandev,
570 wanif_conf_t __user *u_conf)
571{
572 wanif_conf_t *cnf;
573 struct net_device *dev = NULL;
1da177e4
LT		 574 int err;
575
576 if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
577 return -ENODEV;
578
579 cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
580 if (!cnf)
581 return -ENOBUFS;
582
583 err = -EFAULT;
584 if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
585 goto out;
586
587 err = -EINVAL;
588 if (cnf->magic != ROUTER_MAGIC)
589 goto out;
590
591 if (cnf->config_id == WANCONFIG_MPPP) {
1da177e4
LT		 592 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
593 wandev->name);
594 err = -EPROTONOSUPPORT;
595 goto out;
1da177e4 596 } else {
1da177e4
LT		 597 err = wandev->new_if(wandev, dev, cnf);
598 }
599
600 if (!err) {
601 /* Register network interface. This will invoke init()
602 * function supplied by the driver. If device registered
603 * successfully, add it to the interface list.
604 */
605
606 if (dev->name == NULL) {
607 err = -EINVAL;
608 } else {
609
610 #ifdef WANDEBUG
611 printk(KERN_INFO "%s: registering interface %s...\n",
612 wanrouter_modname, dev->name);
613 #endif
614
615 err = register_netdev(dev);
616 if (!err) {
617 struct net_device *slave = NULL;
618 unsigned long smp_flags=0;
619
620 lock_adapter_irq(&wandev->lock, &smp_flags);
621
622 if (wandev->dev == NULL) {
623 wandev->dev = dev;
624 } else {
625 for (slave=wandev->dev;
7be6065b
WC		 626 DEV_TO_SLAVE(slave);
627 slave = DEV_TO_SLAVE(slave))
628 DEV_TO_SLAVE(slave) = dev;
1da177e4
LT		 629 }
630 ++wandev->ndev;
631
632 unlock_adapter_irq(&wandev->lock, &smp_flags);
633 err = 0; /* done !!! */
634 goto out;
635 }
636 }
637 if (wandev->del_if)
638 wandev->del_if(wandev, dev);
7be6065b 639 free_netdev(dev);
1da177e4
LT		 640 }
641
1da177e4
LT		 642out:
643 kfree(cnf);
644 return err;
645}
646
647
648/*
649 * Delete WAN logical channel.
650 * o verify user address space
651 * o copy configuration data to kernel address space
652 */
653
654static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
655{
656 char name[WAN_IFNAME_SZ + 1];
4ba6122b 657 int err = 0;
1da177e4
LT		 658
659 if (wandev->state == WAN_UNCONFIGURED)
660 return -ENODEV;
661
662 memset(name, 0, sizeof(name));
663
664 if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
665 return -EFAULT;
666
667 err = wanrouter_delete_interface(wandev, name);
668 if (err)
669 return err;
670
671 /* If last interface being deleted, shutdown card
672 * This helps with administration at leaf nodes
673 * (You can tell if the person at the other end of the phone
674 * has an interface configured) and avoids DoS vulnerabilities
675 * in binary driver files - this fixes a problem with the current
676 * Sangoma driver going into strange states when all the network
677 * interfaces are deleted and the link irrecoverably disconnected.
678 */
679
4ba6122b
YH		 680 if (!wandev->ndev && wandev->shutdown)
681 err = wandev->shutdown(wandev);
1da177e4
LT		 682
683 return err;
684}
685
686/*
687 * Miscellaneous Functions
688 */
689
690/*
691 * Find WAN device by name.
692 * Return pointer to the WAN device data space or NULL if device not found.
693 */
694
695static struct wan_device *wanrouter_find_device(char *name)
696{
697 struct wan_device *wandev;
698
699 for (wandev = wanrouter_router_devlist;
700 wandev && strcmp(wandev->name, name);
701 wandev = wandev->next);
702 return wandev;
703}
704
705/*
706 * Delete WAN logical channel identified by its name.
707 * o find logical channel by its name
708 * o call driver's del_if() entry point
709 * o unregister network interface
710 * o unlink channel data space from linked list of channels
711 * o release channel data space
712 *
713 * Return: 0 success
714 * -ENODEV channel not found.
715 * -EBUSY interface is open
716 *
717 * Note: If (force != 0), then device will be destroyed even if interface
718 * associated with it is open. It's caller's responsibility to make
719 * sure that opened interfaces are not removed!
720 */
721
722static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
723{
724 struct net_device *dev = NULL, *prev = NULL;
725 unsigned long smp_flags=0;
726
727 lock_adapter_irq(&wandev->lock, &smp_flags);
728 dev = wandev->dev;
729 prev = NULL;
730 while (dev && strcmp(name, dev->name)) {
7be6065b 731 struct net_device **slave = netdev_priv(dev);
1da177e4
LT		 732 prev = dev;
733 dev = *slave;
734 }
735 unlock_adapter_irq(&wandev->lock, &smp_flags);
736
737 if (dev == NULL)
738 return -ENODEV; /* interface not found */
739
740 if (netif_running(dev))
741 return -EBUSY; /* interface in use */
742
743 if (wandev->del_if)
744 wandev->del_if(wandev, dev);
745
746 lock_adapter_irq(&wandev->lock, &smp_flags);
747 if (prev) {
7be6065b
WC		 748 struct net_device **prev_slave = netdev_priv(prev);
749 struct net_device **slave = netdev_priv(dev);
1da177e4
LT		 750
751 *prev_slave = *slave;
752 } else {
7be6065b 753 struct net_device **slave = netdev_priv(dev);
1da177e4
LT		 754 wandev->dev = *slave;
755 }
756 --wandev->ndev;
757 unlock_adapter_irq(&wandev->lock, &smp_flags);
758
759 printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
760
1da177e4
LT		 761 unregister_netdev(dev);
762
763 free_netdev(dev);
764
765 return 0;
766}
767
97353cb4 768static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
9ee62630 769 __acquires(lock)
1da177e4 770{
4ba6122b 771 spin_lock_irqsave(lock, *smp_flags);
1da177e4
LT		 772}
773
774
97353cb4 775static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
9ee62630 776 __releases(lock)
1da177e4
LT		 777{
778 spin_unlock_irqrestore(lock, *smp_flags);
779}
780
781EXPORT_SYMBOL(register_wan_device);
782EXPORT_SYMBOL(unregister_wan_device);
1da177e4
LT		 783
784MODULE_LICENSE("GPL");
785
786/*
787 * End
788 */
Linux 6.x block layer and io_uring tree(s)