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USB: remove race condition in usbfs/libusb when using reap-after-disconnect
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h> /* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <linux/uaccess.h>
53 #include <linux/dma-mapping.h>
54 #include <asm/byteorder.h>
55 #include <linux/moduleparam.h>
56
57 #include "usb.h"
58
59 #define USB_MAXBUS 64
60 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
61 #define USB_SG_SIZE 16384 /* split-size for large txs */
62
63 /* Mutual exclusion for removal, open, and release */
64 DEFINE_MUTEX(usbfs_mutex);
65
66 struct usb_dev_state {
67 struct list_head list; /* state list */
68 struct usb_device *dev;
69 struct file *file;
70 spinlock_t lock; /* protects the async urb lists */
71 struct list_head async_pending;
72 struct list_head async_completed;
73 struct list_head memory_list;
74 wait_queue_head_t wait; /* wake up if a request completed */
75 unsigned int discsignr;
76 struct pid *disc_pid;
77 const struct cred *cred;
78 void __user *disccontext;
79 unsigned long ifclaimed;
80 u32 secid;
81 u32 disabled_bulk_eps;
82 bool privileges_dropped;
83 unsigned long interface_allowed_mask;
84 };
85
86 struct usb_memory {
87 struct list_head memlist;
88 int vma_use_count;
89 int urb_use_count;
90 u32 size;
91 void *mem;
92 dma_addr_t dma_handle;
93 unsigned long vm_start;
94 struct usb_dev_state *ps;
95 };
96
97 struct async {
98 struct list_head asynclist;
99 struct usb_dev_state *ps;
100 struct pid *pid;
101 const struct cred *cred;
102 unsigned int signr;
103 unsigned int ifnum;
104 void __user *userbuffer;
105 void __user *userurb;
106 struct urb *urb;
107 struct usb_memory *usbm;
108 unsigned int mem_usage;
109 int status;
110 u32 secid;
111 u8 bulk_addr;
112 u8 bulk_status;
113 };
114
115 static bool usbfs_snoop;
116 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
118
119 static unsigned usbfs_snoop_max = 65536;
120 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
121 MODULE_PARM_DESC(usbfs_snoop_max,
122 "maximum number of bytes to print while snooping");
123
124 #define snoop(dev, format, arg...) \
125 do { \
126 if (usbfs_snoop) \
127 dev_info(dev, format, ## arg); \
128 } while (0)
129
130 enum snoop_when {
131 SUBMIT, COMPLETE
132 };
133
134 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
135
136 /* Limit on the total amount of memory we can allocate for transfers */
137 static unsigned usbfs_memory_mb = 16;
138 module_param(usbfs_memory_mb, uint, 0644);
139 MODULE_PARM_DESC(usbfs_memory_mb,
140 "maximum MB allowed for usbfs buffers (0 = no limit)");
141
142 /* Hard limit, necessary to avoid arithmetic overflow */
143 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
144
145 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
146
147 /* Check whether it's okay to allocate more memory for a transfer */
148 static int usbfs_increase_memory_usage(unsigned amount)
149 {
150 unsigned lim;
151
152 /*
153 * Convert usbfs_memory_mb to bytes, avoiding overflows.
154 * 0 means use the hard limit (effectively unlimited).
155 */
156 lim = ACCESS_ONCE(usbfs_memory_mb);
157 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
158 lim = USBFS_XFER_MAX;
159 else
160 lim <<= 20;
161
162 atomic_add(amount, &usbfs_memory_usage);
163 if (atomic_read(&usbfs_memory_usage) <= lim)
164 return 0;
165 atomic_sub(amount, &usbfs_memory_usage);
166 return -ENOMEM;
167 }
168
169 /* Memory for a transfer is being deallocated */
170 static void usbfs_decrease_memory_usage(unsigned amount)
171 {
172 atomic_sub(amount, &usbfs_memory_usage);
173 }
174
175 static int connected(struct usb_dev_state *ps)
176 {
177 return (!list_empty(&ps->list) &&
178 ps->dev->state != USB_STATE_NOTATTACHED);
179 }
180
181 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
182 {
183 struct usb_dev_state *ps = usbm->ps;
184 unsigned long flags;
185
186 spin_lock_irqsave(&ps->lock, flags);
187 --*count;
188 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
189 list_del(&usbm->memlist);
190 spin_unlock_irqrestore(&ps->lock, flags);
191
192 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
193 usbm->dma_handle);
194 usbfs_decrease_memory_usage(
195 usbm->size + sizeof(struct usb_memory));
196 kfree(usbm);
197 } else {
198 spin_unlock_irqrestore(&ps->lock, flags);
199 }
200 }
201
202 static void usbdev_vm_open(struct vm_area_struct *vma)
203 {
204 struct usb_memory *usbm = vma->vm_private_data;
205 unsigned long flags;
206
207 spin_lock_irqsave(&usbm->ps->lock, flags);
208 ++usbm->vma_use_count;
209 spin_unlock_irqrestore(&usbm->ps->lock, flags);
210 }
211
212 static void usbdev_vm_close(struct vm_area_struct *vma)
213 {
214 struct usb_memory *usbm = vma->vm_private_data;
215
216 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
217 }
218
219 static struct vm_operations_struct usbdev_vm_ops = {
220 .open = usbdev_vm_open,
221 .close = usbdev_vm_close
222 };
223
224 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
225 {
226 struct usb_memory *usbm = NULL;
227 struct usb_dev_state *ps = file->private_data;
228 size_t size = vma->vm_end - vma->vm_start;
229 void *mem;
230 unsigned long flags;
231 dma_addr_t dma_handle;
232 int ret;
233
234 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
235 if (ret)
236 goto error;
237
238 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
239 if (!usbm) {
240 ret = -ENOMEM;
241 goto error_decrease_mem;
242 }
243
244 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
245 &dma_handle);
246 if (!mem) {
247 ret = -ENOMEM;
248 goto error_free_usbm;
249 }
250
251 memset(mem, 0, size);
252
253 usbm->mem = mem;
254 usbm->dma_handle = dma_handle;
255 usbm->size = size;
256 usbm->ps = ps;
257 usbm->vm_start = vma->vm_start;
258 usbm->vma_use_count = 1;
259 INIT_LIST_HEAD(&usbm->memlist);
260
261 if (remap_pfn_range(vma, vma->vm_start,
262 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
263 size, vma->vm_page_prot) < 0) {
264 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
265 return -EAGAIN;
266 }
267
268 vma->vm_flags |= VM_IO;
269 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
270 vma->vm_ops = &usbdev_vm_ops;
271 vma->vm_private_data = usbm;
272
273 spin_lock_irqsave(&ps->lock, flags);
274 list_add_tail(&usbm->memlist, &ps->memory_list);
275 spin_unlock_irqrestore(&ps->lock, flags);
276
277 return 0;
278
279 error_free_usbm:
280 kfree(usbm);
281 error_decrease_mem:
282 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
283 error:
284 return ret;
285 }
286
287 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
288 loff_t *ppos)
289 {
290 struct usb_dev_state *ps = file->private_data;
291 struct usb_device *dev = ps->dev;
292 ssize_t ret = 0;
293 unsigned len;
294 loff_t pos;
295 int i;
296
297 pos = *ppos;
298 usb_lock_device(dev);
299 if (!connected(ps)) {
300 ret = -ENODEV;
301 goto err;
302 } else if (pos < 0) {
303 ret = -EINVAL;
304 goto err;
305 }
306
307 if (pos < sizeof(struct usb_device_descriptor)) {
308 /* 18 bytes - fits on the stack */
309 struct usb_device_descriptor temp_desc;
310
311 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
312 le16_to_cpus(&temp_desc.bcdUSB);
313 le16_to_cpus(&temp_desc.idVendor);
314 le16_to_cpus(&temp_desc.idProduct);
315 le16_to_cpus(&temp_desc.bcdDevice);
316
317 len = sizeof(struct usb_device_descriptor) - pos;
318 if (len > nbytes)
319 len = nbytes;
320 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
321 ret = -EFAULT;
322 goto err;
323 }
324
325 *ppos += len;
326 buf += len;
327 nbytes -= len;
328 ret += len;
329 }
330
331 pos = sizeof(struct usb_device_descriptor);
332 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
333 struct usb_config_descriptor *config =
334 (struct usb_config_descriptor *)dev->rawdescriptors[i];
335 unsigned int length = le16_to_cpu(config->wTotalLength);
336
337 if (*ppos < pos + length) {
338
339 /* The descriptor may claim to be longer than it
340 * really is. Here is the actual allocated length. */
341 unsigned alloclen =
342 le16_to_cpu(dev->config[i].desc.wTotalLength);
343
344 len = length - (*ppos - pos);
345 if (len > nbytes)
346 len = nbytes;
347
348 /* Simply don't write (skip over) unallocated parts */
349 if (alloclen > (*ppos - pos)) {
350 alloclen -= (*ppos - pos);
351 if (copy_to_user(buf,
352 dev->rawdescriptors[i] + (*ppos - pos),
353 min(len, alloclen))) {
354 ret = -EFAULT;
355 goto err;
356 }
357 }
358
359 *ppos += len;
360 buf += len;
361 nbytes -= len;
362 ret += len;
363 }
364
365 pos += length;
366 }
367
368 err:
369 usb_unlock_device(dev);
370 return ret;
371 }
372
373 /*
374 * async list handling
375 */
376
377 static struct async *alloc_async(unsigned int numisoframes)
378 {
379 struct async *as;
380
381 as = kzalloc(sizeof(struct async), GFP_KERNEL);
382 if (!as)
383 return NULL;
384 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
385 if (!as->urb) {
386 kfree(as);
387 return NULL;
388 }
389 return as;
390 }
391
392 static void free_async(struct async *as)
393 {
394 int i;
395
396 put_pid(as->pid);
397 if (as->cred)
398 put_cred(as->cred);
399 for (i = 0; i < as->urb->num_sgs; i++) {
400 if (sg_page(&as->urb->sg[i]))
401 kfree(sg_virt(&as->urb->sg[i]));
402 }
403
404 kfree(as->urb->sg);
405 if (as->usbm == NULL)
406 kfree(as->urb->transfer_buffer);
407 else
408 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
409
410 kfree(as->urb->setup_packet);
411 usb_free_urb(as->urb);
412 usbfs_decrease_memory_usage(as->mem_usage);
413 kfree(as);
414 }
415
416 static void async_newpending(struct async *as)
417 {
418 struct usb_dev_state *ps = as->ps;
419 unsigned long flags;
420
421 spin_lock_irqsave(&ps->lock, flags);
422 list_add_tail(&as->asynclist, &ps->async_pending);
423 spin_unlock_irqrestore(&ps->lock, flags);
424 }
425
426 static void async_removepending(struct async *as)
427 {
428 struct usb_dev_state *ps = as->ps;
429 unsigned long flags;
430
431 spin_lock_irqsave(&ps->lock, flags);
432 list_del_init(&as->asynclist);
433 spin_unlock_irqrestore(&ps->lock, flags);
434 }
435
436 static struct async *async_getcompleted(struct usb_dev_state *ps)
437 {
438 unsigned long flags;
439 struct async *as = NULL;
440
441 spin_lock_irqsave(&ps->lock, flags);
442 if (!list_empty(&ps->async_completed)) {
443 as = list_entry(ps->async_completed.next, struct async,
444 asynclist);
445 list_del_init(&as->asynclist);
446 }
447 spin_unlock_irqrestore(&ps->lock, flags);
448 return as;
449 }
450
451 static struct async *async_getpending(struct usb_dev_state *ps,
452 void __user *userurb)
453 {
454 struct async *as;
455
456 list_for_each_entry(as, &ps->async_pending, asynclist)
457 if (as->userurb == userurb) {
458 list_del_init(&as->asynclist);
459 return as;
460 }
461
462 return NULL;
463 }
464
465 static void snoop_urb(struct usb_device *udev,
466 void __user *userurb, int pipe, unsigned length,
467 int timeout_or_status, enum snoop_when when,
468 unsigned char *data, unsigned data_len)
469 {
470 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
471 static const char *dirs[] = {"out", "in"};
472 int ep;
473 const char *t, *d;
474
475 if (!usbfs_snoop)
476 return;
477
478 ep = usb_pipeendpoint(pipe);
479 t = types[usb_pipetype(pipe)];
480 d = dirs[!!usb_pipein(pipe)];
481
482 if (userurb) { /* Async */
483 if (when == SUBMIT)
484 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
485 "length %u\n",
486 userurb, ep, t, d, length);
487 else
488 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
489 "actual_length %u status %d\n",
490 userurb, ep, t, d, length,
491 timeout_or_status);
492 } else {
493 if (when == SUBMIT)
494 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
495 "timeout %d\n",
496 ep, t, d, length, timeout_or_status);
497 else
498 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
499 "status %d\n",
500 ep, t, d, length, timeout_or_status);
501 }
502
503 data_len = min(data_len, usbfs_snoop_max);
504 if (data && data_len > 0) {
505 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
506 data, data_len, 1);
507 }
508 }
509
510 static void snoop_urb_data(struct urb *urb, unsigned len)
511 {
512 int i, size;
513
514 len = min(len, usbfs_snoop_max);
515 if (!usbfs_snoop || len == 0)
516 return;
517
518 if (urb->num_sgs == 0) {
519 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
520 urb->transfer_buffer, len, 1);
521 return;
522 }
523
524 for (i = 0; i < urb->num_sgs && len; i++) {
525 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
526 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
527 sg_virt(&urb->sg[i]), size, 1);
528 len -= size;
529 }
530 }
531
532 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
533 {
534 unsigned i, len, size;
535
536 if (urb->number_of_packets > 0) /* Isochronous */
537 len = urb->transfer_buffer_length;
538 else /* Non-Isoc */
539 len = urb->actual_length;
540
541 if (urb->num_sgs == 0) {
542 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
543 return -EFAULT;
544 return 0;
545 }
546
547 for (i = 0; i < urb->num_sgs && len; i++) {
548 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
549 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
550 return -EFAULT;
551 userbuffer += size;
552 len -= size;
553 }
554
555 return 0;
556 }
557
558 #define AS_CONTINUATION 1
559 #define AS_UNLINK 2
560
561 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
562 __releases(ps->lock)
563 __acquires(ps->lock)
564 {
565 struct urb *urb;
566 struct async *as;
567
568 /* Mark all the pending URBs that match bulk_addr, up to but not
569 * including the first one without AS_CONTINUATION. If such an
570 * URB is encountered then a new transfer has already started so
571 * the endpoint doesn't need to be disabled; otherwise it does.
572 */
573 list_for_each_entry(as, &ps->async_pending, asynclist) {
574 if (as->bulk_addr == bulk_addr) {
575 if (as->bulk_status != AS_CONTINUATION)
576 goto rescan;
577 as->bulk_status = AS_UNLINK;
578 as->bulk_addr = 0;
579 }
580 }
581 ps->disabled_bulk_eps |= (1 << bulk_addr);
582
583 /* Now carefully unlink all the marked pending URBs */
584 rescan:
585 list_for_each_entry(as, &ps->async_pending, asynclist) {
586 if (as->bulk_status == AS_UNLINK) {
587 as->bulk_status = 0; /* Only once */
588 urb = as->urb;
589 usb_get_urb(urb);
590 spin_unlock(&ps->lock); /* Allow completions */
591 usb_unlink_urb(urb);
592 usb_put_urb(urb);
593 spin_lock(&ps->lock);
594 goto rescan;
595 }
596 }
597 }
598
599 static void async_completed(struct urb *urb)
600 {
601 struct async *as = urb->context;
602 struct usb_dev_state *ps = as->ps;
603 struct siginfo sinfo;
604 struct pid *pid = NULL;
605 u32 secid = 0;
606 const struct cred *cred = NULL;
607 int signr;
608
609 spin_lock(&ps->lock);
610 list_move_tail(&as->asynclist, &ps->async_completed);
611 as->status = urb->status;
612 signr = as->signr;
613 if (signr) {
614 memset(&sinfo, 0, sizeof(sinfo));
615 sinfo.si_signo = as->signr;
616 sinfo.si_errno = as->status;
617 sinfo.si_code = SI_ASYNCIO;
618 sinfo.si_addr = as->userurb;
619 pid = get_pid(as->pid);
620 cred = get_cred(as->cred);
621 secid = as->secid;
622 }
623 snoop(&urb->dev->dev, "urb complete\n");
624 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
625 as->status, COMPLETE, NULL, 0);
626 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
627 snoop_urb_data(urb, urb->actual_length);
628
629 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
630 as->status != -ENOENT)
631 cancel_bulk_urbs(ps, as->bulk_addr);
632 spin_unlock(&ps->lock);
633
634 if (signr) {
635 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
636 put_pid(pid);
637 put_cred(cred);
638 }
639
640 wake_up(&ps->wait);
641 }
642
643 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
644 {
645 struct urb *urb;
646 struct async *as;
647 unsigned long flags;
648
649 spin_lock_irqsave(&ps->lock, flags);
650 while (!list_empty(list)) {
651 as = list_entry(list->next, struct async, asynclist);
652 list_del_init(&as->asynclist);
653 urb = as->urb;
654 usb_get_urb(urb);
655
656 /* drop the spinlock so the completion handler can run */
657 spin_unlock_irqrestore(&ps->lock, flags);
658 usb_kill_urb(urb);
659 usb_put_urb(urb);
660 spin_lock_irqsave(&ps->lock, flags);
661 }
662 spin_unlock_irqrestore(&ps->lock, flags);
663 }
664
665 static void destroy_async_on_interface(struct usb_dev_state *ps,
666 unsigned int ifnum)
667 {
668 struct list_head *p, *q, hitlist;
669 unsigned long flags;
670
671 INIT_LIST_HEAD(&hitlist);
672 spin_lock_irqsave(&ps->lock, flags);
673 list_for_each_safe(p, q, &ps->async_pending)
674 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
675 list_move_tail(p, &hitlist);
676 spin_unlock_irqrestore(&ps->lock, flags);
677 destroy_async(ps, &hitlist);
678 }
679
680 static void destroy_all_async(struct usb_dev_state *ps)
681 {
682 destroy_async(ps, &ps->async_pending);
683 }
684
685 /*
686 * interface claims are made only at the request of user level code,
687 * which can also release them (explicitly or by closing files).
688 * they're also undone when devices disconnect.
689 */
690
691 static int driver_probe(struct usb_interface *intf,
692 const struct usb_device_id *id)
693 {
694 return -ENODEV;
695 }
696
697 static void driver_disconnect(struct usb_interface *intf)
698 {
699 struct usb_dev_state *ps = usb_get_intfdata(intf);
700 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
701
702 if (!ps)
703 return;
704
705 /* NOTE: this relies on usbcore having canceled and completed
706 * all pending I/O requests; 2.6 does that.
707 */
708
709 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
710 clear_bit(ifnum, &ps->ifclaimed);
711 else
712 dev_warn(&intf->dev, "interface number %u out of range\n",
713 ifnum);
714
715 usb_set_intfdata(intf, NULL);
716
717 /* force async requests to complete */
718 destroy_async_on_interface(ps, ifnum);
719 }
720
721 /* The following routines are merely placeholders. There is no way
722 * to inform a user task about suspend or resumes.
723 */
724 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
725 {
726 return 0;
727 }
728
729 static int driver_resume(struct usb_interface *intf)
730 {
731 return 0;
732 }
733
734 struct usb_driver usbfs_driver = {
735 .name = "usbfs",
736 .probe = driver_probe,
737 .disconnect = driver_disconnect,
738 .suspend = driver_suspend,
739 .resume = driver_resume,
740 };
741
742 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
743 {
744 struct usb_device *dev = ps->dev;
745 struct usb_interface *intf;
746 int err;
747
748 if (ifnum >= 8*sizeof(ps->ifclaimed))
749 return -EINVAL;
750 /* already claimed */
751 if (test_bit(ifnum, &ps->ifclaimed))
752 return 0;
753
754 if (ps->privileges_dropped &&
755 !test_bit(ifnum, &ps->interface_allowed_mask))
756 return -EACCES;
757
758 intf = usb_ifnum_to_if(dev, ifnum);
759 if (!intf)
760 err = -ENOENT;
761 else
762 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
763 if (err == 0)
764 set_bit(ifnum, &ps->ifclaimed);
765 return err;
766 }
767
768 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
769 {
770 struct usb_device *dev;
771 struct usb_interface *intf;
772 int err;
773
774 err = -EINVAL;
775 if (ifnum >= 8*sizeof(ps->ifclaimed))
776 return err;
777 dev = ps->dev;
778 intf = usb_ifnum_to_if(dev, ifnum);
779 if (!intf)
780 err = -ENOENT;
781 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
782 usb_driver_release_interface(&usbfs_driver, intf);
783 err = 0;
784 }
785 return err;
786 }
787
788 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
789 {
790 if (ps->dev->state != USB_STATE_CONFIGURED)
791 return -EHOSTUNREACH;
792 if (ifnum >= 8*sizeof(ps->ifclaimed))
793 return -EINVAL;
794 if (test_bit(ifnum, &ps->ifclaimed))
795 return 0;
796 /* if not yet claimed, claim it for the driver */
797 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
798 "interface %u before use\n", task_pid_nr(current),
799 current->comm, ifnum);
800 return claimintf(ps, ifnum);
801 }
802
803 static int findintfep(struct usb_device *dev, unsigned int ep)
804 {
805 unsigned int i, j, e;
806 struct usb_interface *intf;
807 struct usb_host_interface *alts;
808 struct usb_endpoint_descriptor *endpt;
809
810 if (ep & ~(USB_DIR_IN|0xf))
811 return -EINVAL;
812 if (!dev->actconfig)
813 return -ESRCH;
814 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
815 intf = dev->actconfig->interface[i];
816 for (j = 0; j < intf->num_altsetting; j++) {
817 alts = &intf->altsetting[j];
818 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
819 endpt = &alts->endpoint[e].desc;
820 if (endpt->bEndpointAddress == ep)
821 return alts->desc.bInterfaceNumber;
822 }
823 }
824 }
825 return -ENOENT;
826 }
827
828 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
829 unsigned int request, unsigned int index)
830 {
831 int ret = 0;
832 struct usb_host_interface *alt_setting;
833
834 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
835 && ps->dev->state != USB_STATE_ADDRESS
836 && ps->dev->state != USB_STATE_CONFIGURED)
837 return -EHOSTUNREACH;
838 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
839 return 0;
840
841 /*
842 * check for the special corner case 'get_device_id' in the printer
843 * class specification, which we always want to allow as it is used
844 * to query things like ink level, etc.
845 */
846 if (requesttype == 0xa1 && request == 0) {
847 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
848 index >> 8, index & 0xff);
849 if (alt_setting
850 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
851 return 0;
852 }
853
854 index &= 0xff;
855 switch (requesttype & USB_RECIP_MASK) {
856 case USB_RECIP_ENDPOINT:
857 if ((index & ~USB_DIR_IN) == 0)
858 return 0;
859 ret = findintfep(ps->dev, index);
860 if (ret < 0) {
861 /*
862 * Some not fully compliant Win apps seem to get
863 * index wrong and have the endpoint number here
864 * rather than the endpoint address (with the
865 * correct direction). Win does let this through,
866 * so we'll not reject it here but leave it to
867 * the device to not break KVM. But we warn.
868 */
869 ret = findintfep(ps->dev, index ^ 0x80);
870 if (ret >= 0)
871 dev_info(&ps->dev->dev,
872 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
873 __func__, task_pid_nr(current),
874 current->comm, index, index ^ 0x80);
875 }
876 if (ret >= 0)
877 ret = checkintf(ps, ret);
878 break;
879
880 case USB_RECIP_INTERFACE:
881 ret = checkintf(ps, index);
882 break;
883 }
884 return ret;
885 }
886
887 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
888 unsigned char ep)
889 {
890 if (ep & USB_ENDPOINT_DIR_MASK)
891 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
892 else
893 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
894 }
895
896 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
897 struct usbdevfs_streams __user *streams,
898 unsigned int *num_streams_ret,
899 unsigned int *num_eps_ret,
900 struct usb_host_endpoint ***eps_ret,
901 struct usb_interface **intf_ret)
902 {
903 unsigned int i, num_streams, num_eps;
904 struct usb_host_endpoint **eps;
905 struct usb_interface *intf = NULL;
906 unsigned char ep;
907 int ifnum, ret;
908
909 if (get_user(num_streams, &streams->num_streams) ||
910 get_user(num_eps, &streams->num_eps))
911 return -EFAULT;
912
913 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
914 return -EINVAL;
915
916 /* The XHCI controller allows max 2 ^ 16 streams */
917 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
918 return -EINVAL;
919
920 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
921 if (!eps)
922 return -ENOMEM;
923
924 for (i = 0; i < num_eps; i++) {
925 if (get_user(ep, &streams->eps[i])) {
926 ret = -EFAULT;
927 goto error;
928 }
929 eps[i] = ep_to_host_endpoint(ps->dev, ep);
930 if (!eps[i]) {
931 ret = -EINVAL;
932 goto error;
933 }
934
935 /* usb_alloc/free_streams operate on an usb_interface */
936 ifnum = findintfep(ps->dev, ep);
937 if (ifnum < 0) {
938 ret = ifnum;
939 goto error;
940 }
941
942 if (i == 0) {
943 ret = checkintf(ps, ifnum);
944 if (ret < 0)
945 goto error;
946 intf = usb_ifnum_to_if(ps->dev, ifnum);
947 } else {
948 /* Verify all eps belong to the same interface */
949 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
950 ret = -EINVAL;
951 goto error;
952 }
953 }
954 }
955
956 if (num_streams_ret)
957 *num_streams_ret = num_streams;
958 *num_eps_ret = num_eps;
959 *eps_ret = eps;
960 *intf_ret = intf;
961
962 return 0;
963
964 error:
965 kfree(eps);
966 return ret;
967 }
968
969 static int match_devt(struct device *dev, void *data)
970 {
971 return dev->devt == (dev_t) (unsigned long) data;
972 }
973
974 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
975 {
976 struct device *dev;
977
978 dev = bus_find_device(&usb_bus_type, NULL,
979 (void *) (unsigned long) devt, match_devt);
980 if (!dev)
981 return NULL;
982 return to_usb_device(dev);
983 }
984
985 /*
986 * file operations
987 */
988 static int usbdev_open(struct inode *inode, struct file *file)
989 {
990 struct usb_device *dev = NULL;
991 struct usb_dev_state *ps;
992 int ret;
993
994 ret = -ENOMEM;
995 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
996 if (!ps)
997 goto out_free_ps;
998
999 ret = -ENODEV;
1000
1001 /* Protect against simultaneous removal or release */
1002 mutex_lock(&usbfs_mutex);
1003
1004 /* usbdev device-node */
1005 if (imajor(inode) == USB_DEVICE_MAJOR)
1006 dev = usbdev_lookup_by_devt(inode->i_rdev);
1007
1008 mutex_unlock(&usbfs_mutex);
1009
1010 if (!dev)
1011 goto out_free_ps;
1012
1013 usb_lock_device(dev);
1014 if (dev->state == USB_STATE_NOTATTACHED)
1015 goto out_unlock_device;
1016
1017 ret = usb_autoresume_device(dev);
1018 if (ret)
1019 goto out_unlock_device;
1020
1021 ps->dev = dev;
1022 ps->file = file;
1023 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1024 spin_lock_init(&ps->lock);
1025 INIT_LIST_HEAD(&ps->list);
1026 INIT_LIST_HEAD(&ps->async_pending);
1027 INIT_LIST_HEAD(&ps->async_completed);
1028 INIT_LIST_HEAD(&ps->memory_list);
1029 init_waitqueue_head(&ps->wait);
1030 ps->disc_pid = get_pid(task_pid(current));
1031 ps->cred = get_current_cred();
1032 security_task_getsecid(current, &ps->secid);
1033 smp_wmb();
1034 list_add_tail(&ps->list, &dev->filelist);
1035 file->private_data = ps;
1036 usb_unlock_device(dev);
1037 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1038 current->comm);
1039 return ret;
1040
1041 out_unlock_device:
1042 usb_unlock_device(dev);
1043 usb_put_dev(dev);
1044 out_free_ps:
1045 kfree(ps);
1046 return ret;
1047 }
1048
1049 static int usbdev_release(struct inode *inode, struct file *file)
1050 {
1051 struct usb_dev_state *ps = file->private_data;
1052 struct usb_device *dev = ps->dev;
1053 unsigned int ifnum;
1054 struct async *as;
1055
1056 usb_lock_device(dev);
1057 usb_hub_release_all_ports(dev, ps);
1058
1059 list_del_init(&ps->list);
1060
1061 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1062 ifnum++) {
1063 if (test_bit(ifnum, &ps->ifclaimed))
1064 releaseintf(ps, ifnum);
1065 }
1066 destroy_all_async(ps);
1067 usb_autosuspend_device(dev);
1068 usb_unlock_device(dev);
1069 usb_put_dev(dev);
1070 put_pid(ps->disc_pid);
1071 put_cred(ps->cred);
1072
1073 as = async_getcompleted(ps);
1074 while (as) {
1075 free_async(as);
1076 as = async_getcompleted(ps);
1077 }
1078
1079 kfree(ps);
1080 return 0;
1081 }
1082
1083 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1084 {
1085 struct usb_device *dev = ps->dev;
1086 struct usbdevfs_ctrltransfer ctrl;
1087 unsigned int tmo;
1088 unsigned char *tbuf;
1089 unsigned wLength;
1090 int i, pipe, ret;
1091
1092 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1093 return -EFAULT;
1094 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1095 ctrl.wIndex);
1096 if (ret)
1097 return ret;
1098 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1099 if (wLength > PAGE_SIZE)
1100 return -EINVAL;
1101 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1102 sizeof(struct usb_ctrlrequest));
1103 if (ret)
1104 return ret;
1105 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1106 if (!tbuf) {
1107 ret = -ENOMEM;
1108 goto done;
1109 }
1110 tmo = ctrl.timeout;
1111 snoop(&dev->dev, "control urb: bRequestType=%02x "
1112 "bRequest=%02x wValue=%04x "
1113 "wIndex=%04x wLength=%04x\n",
1114 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1115 ctrl.wIndex, ctrl.wLength);
1116 if (ctrl.bRequestType & 0x80) {
1117 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1118 ctrl.wLength)) {
1119 ret = -EINVAL;
1120 goto done;
1121 }
1122 pipe = usb_rcvctrlpipe(dev, 0);
1123 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1124
1125 usb_unlock_device(dev);
1126 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1127 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1128 tbuf, ctrl.wLength, tmo);
1129 usb_lock_device(dev);
1130 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1131 tbuf, max(i, 0));
1132 if ((i > 0) && ctrl.wLength) {
1133 if (copy_to_user(ctrl.data, tbuf, i)) {
1134 ret = -EFAULT;
1135 goto done;
1136 }
1137 }
1138 } else {
1139 if (ctrl.wLength) {
1140 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1141 ret = -EFAULT;
1142 goto done;
1143 }
1144 }
1145 pipe = usb_sndctrlpipe(dev, 0);
1146 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1147 tbuf, ctrl.wLength);
1148
1149 usb_unlock_device(dev);
1150 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1151 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1152 tbuf, ctrl.wLength, tmo);
1153 usb_lock_device(dev);
1154 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1155 }
1156 if (i < 0 && i != -EPIPE) {
1157 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1158 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1159 current->comm, ctrl.bRequestType, ctrl.bRequest,
1160 ctrl.wLength, i);
1161 }
1162 ret = i;
1163 done:
1164 free_page((unsigned long) tbuf);
1165 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1166 sizeof(struct usb_ctrlrequest));
1167 return ret;
1168 }
1169
1170 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1171 {
1172 struct usb_device *dev = ps->dev;
1173 struct usbdevfs_bulktransfer bulk;
1174 unsigned int tmo, len1, pipe;
1175 int len2;
1176 unsigned char *tbuf;
1177 int i, ret;
1178
1179 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1180 return -EFAULT;
1181 ret = findintfep(ps->dev, bulk.ep);
1182 if (ret < 0)
1183 return ret;
1184 ret = checkintf(ps, ret);
1185 if (ret)
1186 return ret;
1187 if (bulk.ep & USB_DIR_IN)
1188 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1189 else
1190 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1191 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1192 return -EINVAL;
1193 len1 = bulk.len;
1194 if (len1 >= USBFS_XFER_MAX)
1195 return -EINVAL;
1196 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1197 if (ret)
1198 return ret;
1199 tbuf = kmalloc(len1, GFP_KERNEL);
1200 if (!tbuf) {
1201 ret = -ENOMEM;
1202 goto done;
1203 }
1204 tmo = bulk.timeout;
1205 if (bulk.ep & 0x80) {
1206 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1207 ret = -EINVAL;
1208 goto done;
1209 }
1210 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1211
1212 usb_unlock_device(dev);
1213 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1214 usb_lock_device(dev);
1215 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1216
1217 if (!i && len2) {
1218 if (copy_to_user(bulk.data, tbuf, len2)) {
1219 ret = -EFAULT;
1220 goto done;
1221 }
1222 }
1223 } else {
1224 if (len1) {
1225 if (copy_from_user(tbuf, bulk.data, len1)) {
1226 ret = -EFAULT;
1227 goto done;
1228 }
1229 }
1230 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1231
1232 usb_unlock_device(dev);
1233 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1234 usb_lock_device(dev);
1235 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1236 }
1237 ret = (i < 0 ? i : len2);
1238 done:
1239 kfree(tbuf);
1240 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1241 return ret;
1242 }
1243
1244 static void check_reset_of_active_ep(struct usb_device *udev,
1245 unsigned int epnum, char *ioctl_name)
1246 {
1247 struct usb_host_endpoint **eps;
1248 struct usb_host_endpoint *ep;
1249
1250 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1251 ep = eps[epnum & 0x0f];
1252 if (ep && !list_empty(&ep->urb_list))
1253 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1254 task_pid_nr(current), current->comm,
1255 ioctl_name, epnum);
1256 }
1257
1258 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1259 {
1260 unsigned int ep;
1261 int ret;
1262
1263 if (get_user(ep, (unsigned int __user *)arg))
1264 return -EFAULT;
1265 ret = findintfep(ps->dev, ep);
1266 if (ret < 0)
1267 return ret;
1268 ret = checkintf(ps, ret);
1269 if (ret)
1270 return ret;
1271 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1272 usb_reset_endpoint(ps->dev, ep);
1273 return 0;
1274 }
1275
1276 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1277 {
1278 unsigned int ep;
1279 int pipe;
1280 int ret;
1281
1282 if (get_user(ep, (unsigned int __user *)arg))
1283 return -EFAULT;
1284 ret = findintfep(ps->dev, ep);
1285 if (ret < 0)
1286 return ret;
1287 ret = checkintf(ps, ret);
1288 if (ret)
1289 return ret;
1290 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1291 if (ep & USB_DIR_IN)
1292 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1293 else
1294 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1295
1296 return usb_clear_halt(ps->dev, pipe);
1297 }
1298
1299 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1300 {
1301 struct usbdevfs_getdriver gd;
1302 struct usb_interface *intf;
1303 int ret;
1304
1305 if (copy_from_user(&gd, arg, sizeof(gd)))
1306 return -EFAULT;
1307 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1308 if (!intf || !intf->dev.driver)
1309 ret = -ENODATA;
1310 else {
1311 strlcpy(gd.driver, intf->dev.driver->name,
1312 sizeof(gd.driver));
1313 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1314 }
1315 return ret;
1316 }
1317
1318 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1319 {
1320 struct usbdevfs_connectinfo ci;
1321
1322 memset(&ci, 0, sizeof(ci));
1323 ci.devnum = ps->dev->devnum;
1324 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1325
1326 if (copy_to_user(arg, &ci, sizeof(ci)))
1327 return -EFAULT;
1328 return 0;
1329 }
1330
1331 static int proc_resetdevice(struct usb_dev_state *ps)
1332 {
1333 struct usb_host_config *actconfig = ps->dev->actconfig;
1334 struct usb_interface *interface;
1335 int i, number;
1336
1337 /* Don't allow a device reset if the process has dropped the
1338 * privilege to do such things and any of the interfaces are
1339 * currently claimed.
1340 */
1341 if (ps->privileges_dropped && actconfig) {
1342 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1343 interface = actconfig->interface[i];
1344 number = interface->cur_altsetting->desc.bInterfaceNumber;
1345 if (usb_interface_claimed(interface) &&
1346 !test_bit(number, &ps->ifclaimed)) {
1347 dev_warn(&ps->dev->dev,
1348 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1349 number, interface->dev.driver->name, current->comm);
1350 return -EACCES;
1351 }
1352 }
1353 }
1354
1355 return usb_reset_device(ps->dev);
1356 }
1357
1358 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1359 {
1360 struct usbdevfs_setinterface setintf;
1361 int ret;
1362
1363 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1364 return -EFAULT;
1365 ret = checkintf(ps, setintf.interface);
1366 if (ret)
1367 return ret;
1368
1369 destroy_async_on_interface(ps, setintf.interface);
1370
1371 return usb_set_interface(ps->dev, setintf.interface,
1372 setintf.altsetting);
1373 }
1374
1375 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1376 {
1377 int u;
1378 int status = 0;
1379 struct usb_host_config *actconfig;
1380
1381 if (get_user(u, (int __user *)arg))
1382 return -EFAULT;
1383
1384 actconfig = ps->dev->actconfig;
1385
1386 /* Don't touch the device if any interfaces are claimed.
1387 * It could interfere with other drivers' operations, and if
1388 * an interface is claimed by usbfs it could easily deadlock.
1389 */
1390 if (actconfig) {
1391 int i;
1392
1393 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1394 if (usb_interface_claimed(actconfig->interface[i])) {
1395 dev_warn(&ps->dev->dev,
1396 "usbfs: interface %d claimed by %s "
1397 "while '%s' sets config #%d\n",
1398 actconfig->interface[i]
1399 ->cur_altsetting
1400 ->desc.bInterfaceNumber,
1401 actconfig->interface[i]
1402 ->dev.driver->name,
1403 current->comm, u);
1404 status = -EBUSY;
1405 break;
1406 }
1407 }
1408 }
1409
1410 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1411 * so avoid usb_set_configuration()'s kick to sysfs
1412 */
1413 if (status == 0) {
1414 if (actconfig && actconfig->desc.bConfigurationValue == u)
1415 status = usb_reset_configuration(ps->dev);
1416 else
1417 status = usb_set_configuration(ps->dev, u);
1418 }
1419
1420 return status;
1421 }
1422
1423 static struct usb_memory *
1424 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1425 {
1426 struct usb_memory *usbm = NULL, *iter;
1427 unsigned long flags;
1428 unsigned long uurb_start = (unsigned long)uurb->buffer;
1429
1430 spin_lock_irqsave(&ps->lock, flags);
1431 list_for_each_entry(iter, &ps->memory_list, memlist) {
1432 if (uurb_start >= iter->vm_start &&
1433 uurb_start < iter->vm_start + iter->size) {
1434 if (uurb->buffer_length > iter->vm_start + iter->size -
1435 uurb_start) {
1436 usbm = ERR_PTR(-EINVAL);
1437 } else {
1438 usbm = iter;
1439 usbm->urb_use_count++;
1440 }
1441 break;
1442 }
1443 }
1444 spin_unlock_irqrestore(&ps->lock, flags);
1445 return usbm;
1446 }
1447
1448 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1449 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1450 void __user *arg)
1451 {
1452 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1453 struct usb_host_endpoint *ep;
1454 struct async *as = NULL;
1455 struct usb_ctrlrequest *dr = NULL;
1456 unsigned int u, totlen, isofrmlen;
1457 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1458 int number_of_packets = 0;
1459 unsigned int stream_id = 0;
1460 void *buf;
1461
1462 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1463 USBDEVFS_URB_SHORT_NOT_OK |
1464 USBDEVFS_URB_BULK_CONTINUATION |
1465 USBDEVFS_URB_NO_FSBR |
1466 USBDEVFS_URB_ZERO_PACKET |
1467 USBDEVFS_URB_NO_INTERRUPT))
1468 return -EINVAL;
1469 if (uurb->buffer_length > 0 && !uurb->buffer)
1470 return -EINVAL;
1471 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1472 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1473 ifnum = findintfep(ps->dev, uurb->endpoint);
1474 if (ifnum < 0)
1475 return ifnum;
1476 ret = checkintf(ps, ifnum);
1477 if (ret)
1478 return ret;
1479 }
1480 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1481 if (!ep)
1482 return -ENOENT;
1483 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1484
1485 u = 0;
1486 switch (uurb->type) {
1487 case USBDEVFS_URB_TYPE_CONTROL:
1488 if (!usb_endpoint_xfer_control(&ep->desc))
1489 return -EINVAL;
1490 /* min 8 byte setup packet */
1491 if (uurb->buffer_length < 8)
1492 return -EINVAL;
1493 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1494 if (!dr)
1495 return -ENOMEM;
1496 if (copy_from_user(dr, uurb->buffer, 8)) {
1497 ret = -EFAULT;
1498 goto error;
1499 }
1500 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1501 ret = -EINVAL;
1502 goto error;
1503 }
1504 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1505 le16_to_cpup(&dr->wIndex));
1506 if (ret)
1507 goto error;
1508 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1509 uurb->buffer += 8;
1510 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1511 is_in = 1;
1512 uurb->endpoint |= USB_DIR_IN;
1513 } else {
1514 is_in = 0;
1515 uurb->endpoint &= ~USB_DIR_IN;
1516 }
1517 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1518 "bRequest=%02x wValue=%04x "
1519 "wIndex=%04x wLength=%04x\n",
1520 dr->bRequestType, dr->bRequest,
1521 __le16_to_cpup(&dr->wValue),
1522 __le16_to_cpup(&dr->wIndex),
1523 __le16_to_cpup(&dr->wLength));
1524 u = sizeof(struct usb_ctrlrequest);
1525 break;
1526
1527 case USBDEVFS_URB_TYPE_BULK:
1528 switch (usb_endpoint_type(&ep->desc)) {
1529 case USB_ENDPOINT_XFER_CONTROL:
1530 case USB_ENDPOINT_XFER_ISOC:
1531 return -EINVAL;
1532 case USB_ENDPOINT_XFER_INT:
1533 /* allow single-shot interrupt transfers */
1534 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1535 goto interrupt_urb;
1536 }
1537 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1538 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1539 num_sgs = 0;
1540 if (ep->streams)
1541 stream_id = uurb->stream_id;
1542 break;
1543
1544 case USBDEVFS_URB_TYPE_INTERRUPT:
1545 if (!usb_endpoint_xfer_int(&ep->desc))
1546 return -EINVAL;
1547 interrupt_urb:
1548 break;
1549
1550 case USBDEVFS_URB_TYPE_ISO:
1551 /* arbitrary limit */
1552 if (uurb->number_of_packets < 1 ||
1553 uurb->number_of_packets > 128)
1554 return -EINVAL;
1555 if (!usb_endpoint_xfer_isoc(&ep->desc))
1556 return -EINVAL;
1557 number_of_packets = uurb->number_of_packets;
1558 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1559 number_of_packets;
1560 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1561 if (IS_ERR(isopkt)) {
1562 ret = PTR_ERR(isopkt);
1563 isopkt = NULL;
1564 goto error;
1565 }
1566 for (totlen = u = 0; u < number_of_packets; u++) {
1567 /*
1568 * arbitrary limit need for USB 3.0
1569 * bMaxBurst (0~15 allowed, 1~16 packets)
1570 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1571 * sizemax: 1024 * 16 * 3 = 49152
1572 */
1573 if (isopkt[u].length > 49152) {
1574 ret = -EINVAL;
1575 goto error;
1576 }
1577 totlen += isopkt[u].length;
1578 }
1579 u *= sizeof(struct usb_iso_packet_descriptor);
1580 uurb->buffer_length = totlen;
1581 break;
1582
1583 default:
1584 return -EINVAL;
1585 }
1586
1587 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1588 ret = -EINVAL;
1589 goto error;
1590 }
1591 if (uurb->buffer_length > 0 &&
1592 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1593 uurb->buffer, uurb->buffer_length)) {
1594 ret = -EFAULT;
1595 goto error;
1596 }
1597 as = alloc_async(number_of_packets);
1598 if (!as) {
1599 ret = -ENOMEM;
1600 goto error;
1601 }
1602
1603 as->usbm = find_memory_area(ps, uurb);
1604 if (IS_ERR(as->usbm)) {
1605 ret = PTR_ERR(as->usbm);
1606 as->usbm = NULL;
1607 goto error;
1608 }
1609
1610 /* do not use SG buffers when memory mapped segments
1611 * are in use
1612 */
1613 if (as->usbm)
1614 num_sgs = 0;
1615
1616 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1617 num_sgs * sizeof(struct scatterlist);
1618 ret = usbfs_increase_memory_usage(u);
1619 if (ret)
1620 goto error;
1621 as->mem_usage = u;
1622
1623 if (num_sgs) {
1624 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1625 GFP_KERNEL);
1626 if (!as->urb->sg) {
1627 ret = -ENOMEM;
1628 goto error;
1629 }
1630 as->urb->num_sgs = num_sgs;
1631 sg_init_table(as->urb->sg, as->urb->num_sgs);
1632
1633 totlen = uurb->buffer_length;
1634 for (i = 0; i < as->urb->num_sgs; i++) {
1635 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1636 buf = kmalloc(u, GFP_KERNEL);
1637 if (!buf) {
1638 ret = -ENOMEM;
1639 goto error;
1640 }
1641 sg_set_buf(&as->urb->sg[i], buf, u);
1642
1643 if (!is_in) {
1644 if (copy_from_user(buf, uurb->buffer, u)) {
1645 ret = -EFAULT;
1646 goto error;
1647 }
1648 uurb->buffer += u;
1649 }
1650 totlen -= u;
1651 }
1652 } else if (uurb->buffer_length > 0) {
1653 if (as->usbm) {
1654 unsigned long uurb_start = (unsigned long)uurb->buffer;
1655
1656 as->urb->transfer_buffer = as->usbm->mem +
1657 (uurb_start - as->usbm->vm_start);
1658 } else {
1659 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1660 GFP_KERNEL);
1661 if (!as->urb->transfer_buffer) {
1662 ret = -ENOMEM;
1663 goto error;
1664 }
1665 if (!is_in) {
1666 if (copy_from_user(as->urb->transfer_buffer,
1667 uurb->buffer,
1668 uurb->buffer_length)) {
1669 ret = -EFAULT;
1670 goto error;
1671 }
1672 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1673 /*
1674 * Isochronous input data may end up being
1675 * discontiguous if some of the packets are
1676 * short. Clear the buffer so that the gaps
1677 * don't leak kernel data to userspace.
1678 */
1679 memset(as->urb->transfer_buffer, 0,
1680 uurb->buffer_length);
1681 }
1682 }
1683 }
1684 as->urb->dev = ps->dev;
1685 as->urb->pipe = (uurb->type << 30) |
1686 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1687 (uurb->endpoint & USB_DIR_IN);
1688
1689 /* This tedious sequence is necessary because the URB_* flags
1690 * are internal to the kernel and subject to change, whereas
1691 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1692 */
1693 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1694 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1695 u |= URB_ISO_ASAP;
1696 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1697 u |= URB_SHORT_NOT_OK;
1698 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1699 u |= URB_NO_FSBR;
1700 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1701 u |= URB_ZERO_PACKET;
1702 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1703 u |= URB_NO_INTERRUPT;
1704 as->urb->transfer_flags = u;
1705
1706 as->urb->transfer_buffer_length = uurb->buffer_length;
1707 as->urb->setup_packet = (unsigned char *)dr;
1708 dr = NULL;
1709 as->urb->start_frame = uurb->start_frame;
1710 as->urb->number_of_packets = number_of_packets;
1711 as->urb->stream_id = stream_id;
1712 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1713 ps->dev->speed == USB_SPEED_HIGH)
1714 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1715 else
1716 as->urb->interval = ep->desc.bInterval;
1717 as->urb->context = as;
1718 as->urb->complete = async_completed;
1719 for (totlen = u = 0; u < number_of_packets; u++) {
1720 as->urb->iso_frame_desc[u].offset = totlen;
1721 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1722 totlen += isopkt[u].length;
1723 }
1724 kfree(isopkt);
1725 isopkt = NULL;
1726 as->ps = ps;
1727 as->userurb = arg;
1728 if (as->usbm) {
1729 unsigned long uurb_start = (unsigned long)uurb->buffer;
1730
1731 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1732 as->urb->transfer_dma = as->usbm->dma_handle +
1733 (uurb_start - as->usbm->vm_start);
1734 } else if (is_in && uurb->buffer_length > 0)
1735 as->userbuffer = uurb->buffer;
1736 as->signr = uurb->signr;
1737 as->ifnum = ifnum;
1738 as->pid = get_pid(task_pid(current));
1739 as->cred = get_current_cred();
1740 security_task_getsecid(current, &as->secid);
1741 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1742 as->urb->transfer_buffer_length, 0, SUBMIT,
1743 NULL, 0);
1744 if (!is_in)
1745 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1746
1747 async_newpending(as);
1748
1749 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1750 spin_lock_irq(&ps->lock);
1751
1752 /* Not exactly the endpoint address; the direction bit is
1753 * shifted to the 0x10 position so that the value will be
1754 * between 0 and 31.
1755 */
1756 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1757 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1758 >> 3);
1759
1760 /* If this bulk URB is the start of a new transfer, re-enable
1761 * the endpoint. Otherwise mark it as a continuation URB.
1762 */
1763 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1764 as->bulk_status = AS_CONTINUATION;
1765 else
1766 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1767
1768 /* Don't accept continuation URBs if the endpoint is
1769 * disabled because of an earlier error.
1770 */
1771 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1772 ret = -EREMOTEIO;
1773 else
1774 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1775 spin_unlock_irq(&ps->lock);
1776 } else {
1777 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1778 }
1779
1780 if (ret) {
1781 dev_printk(KERN_DEBUG, &ps->dev->dev,
1782 "usbfs: usb_submit_urb returned %d\n", ret);
1783 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1784 0, ret, COMPLETE, NULL, 0);
1785 async_removepending(as);
1786 goto error;
1787 }
1788 return 0;
1789
1790 error:
1791 if (as && as->usbm)
1792 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1793 kfree(isopkt);
1794 kfree(dr);
1795 if (as)
1796 free_async(as);
1797 return ret;
1798 }
1799
1800 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1801 {
1802 struct usbdevfs_urb uurb;
1803
1804 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1805 return -EFAULT;
1806
1807 return proc_do_submiturb(ps, &uurb,
1808 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1809 arg);
1810 }
1811
1812 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1813 {
1814 struct urb *urb;
1815 struct async *as;
1816 unsigned long flags;
1817
1818 spin_lock_irqsave(&ps->lock, flags);
1819 as = async_getpending(ps, arg);
1820 if (!as) {
1821 spin_unlock_irqrestore(&ps->lock, flags);
1822 return -EINVAL;
1823 }
1824
1825 urb = as->urb;
1826 usb_get_urb(urb);
1827 spin_unlock_irqrestore(&ps->lock, flags);
1828
1829 usb_kill_urb(urb);
1830 usb_put_urb(urb);
1831
1832 return 0;
1833 }
1834
1835 static int processcompl(struct async *as, void __user * __user *arg)
1836 {
1837 struct urb *urb = as->urb;
1838 struct usbdevfs_urb __user *userurb = as->userurb;
1839 void __user *addr = as->userurb;
1840 unsigned int i;
1841
1842 if (as->userbuffer && urb->actual_length) {
1843 if (copy_urb_data_to_user(as->userbuffer, urb))
1844 goto err_out;
1845 }
1846 if (put_user(as->status, &userurb->status))
1847 goto err_out;
1848 if (put_user(urb->actual_length, &userurb->actual_length))
1849 goto err_out;
1850 if (put_user(urb->error_count, &userurb->error_count))
1851 goto err_out;
1852
1853 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1854 for (i = 0; i < urb->number_of_packets; i++) {
1855 if (put_user(urb->iso_frame_desc[i].actual_length,
1856 &userurb->iso_frame_desc[i].actual_length))
1857 goto err_out;
1858 if (put_user(urb->iso_frame_desc[i].status,
1859 &userurb->iso_frame_desc[i].status))
1860 goto err_out;
1861 }
1862 }
1863
1864 if (put_user(addr, (void __user * __user *)arg))
1865 return -EFAULT;
1866 return 0;
1867
1868 err_out:
1869 return -EFAULT;
1870 }
1871
1872 static struct async *reap_as(struct usb_dev_state *ps)
1873 {
1874 DECLARE_WAITQUEUE(wait, current);
1875 struct async *as = NULL;
1876 struct usb_device *dev = ps->dev;
1877
1878 add_wait_queue(&ps->wait, &wait);
1879 for (;;) {
1880 __set_current_state(TASK_INTERRUPTIBLE);
1881 as = async_getcompleted(ps);
1882 if (as || !connected(ps))
1883 break;
1884 if (signal_pending(current))
1885 break;
1886 usb_unlock_device(dev);
1887 schedule();
1888 usb_lock_device(dev);
1889 }
1890 remove_wait_queue(&ps->wait, &wait);
1891 set_current_state(TASK_RUNNING);
1892 return as;
1893 }
1894
1895 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1896 {
1897 struct async *as = reap_as(ps);
1898
1899 if (as) {
1900 int retval;
1901
1902 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1903 retval = processcompl(as, (void __user * __user *)arg);
1904 free_async(as);
1905 return retval;
1906 }
1907 if (signal_pending(current))
1908 return -EINTR;
1909 return -ENODEV;
1910 }
1911
1912 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1913 {
1914 int retval;
1915 struct async *as;
1916
1917 as = async_getcompleted(ps);
1918 if (as) {
1919 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1920 retval = processcompl(as, (void __user * __user *)arg);
1921 free_async(as);
1922 } else {
1923 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1924 }
1925 return retval;
1926 }
1927
1928 #ifdef CONFIG_COMPAT
1929 static int proc_control_compat(struct usb_dev_state *ps,
1930 struct usbdevfs_ctrltransfer32 __user *p32)
1931 {
1932 struct usbdevfs_ctrltransfer __user *p;
1933 __u32 udata;
1934 p = compat_alloc_user_space(sizeof(*p));
1935 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1936 get_user(udata, &p32->data) ||
1937 put_user(compat_ptr(udata), &p->data))
1938 return -EFAULT;
1939 return proc_control(ps, p);
1940 }
1941
1942 static int proc_bulk_compat(struct usb_dev_state *ps,
1943 struct usbdevfs_bulktransfer32 __user *p32)
1944 {
1945 struct usbdevfs_bulktransfer __user *p;
1946 compat_uint_t n;
1947 compat_caddr_t addr;
1948
1949 p = compat_alloc_user_space(sizeof(*p));
1950
1951 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1952 get_user(n, &p32->len) || put_user(n, &p->len) ||
1953 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1954 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1955 return -EFAULT;
1956
1957 return proc_bulk(ps, p);
1958 }
1959 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1960 {
1961 struct usbdevfs_disconnectsignal32 ds;
1962
1963 if (copy_from_user(&ds, arg, sizeof(ds)))
1964 return -EFAULT;
1965 ps->discsignr = ds.signr;
1966 ps->disccontext = compat_ptr(ds.context);
1967 return 0;
1968 }
1969
1970 static int get_urb32(struct usbdevfs_urb *kurb,
1971 struct usbdevfs_urb32 __user *uurb)
1972 {
1973 __u32 uptr;
1974 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1975 __get_user(kurb->type, &uurb->type) ||
1976 __get_user(kurb->endpoint, &uurb->endpoint) ||
1977 __get_user(kurb->status, &uurb->status) ||
1978 __get_user(kurb->flags, &uurb->flags) ||
1979 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1980 __get_user(kurb->actual_length, &uurb->actual_length) ||
1981 __get_user(kurb->start_frame, &uurb->start_frame) ||
1982 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1983 __get_user(kurb->error_count, &uurb->error_count) ||
1984 __get_user(kurb->signr, &uurb->signr))
1985 return -EFAULT;
1986
1987 if (__get_user(uptr, &uurb->buffer))
1988 return -EFAULT;
1989 kurb->buffer = compat_ptr(uptr);
1990 if (__get_user(uptr, &uurb->usercontext))
1991 return -EFAULT;
1992 kurb->usercontext = compat_ptr(uptr);
1993
1994 return 0;
1995 }
1996
1997 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1998 {
1999 struct usbdevfs_urb uurb;
2000
2001 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2002 return -EFAULT;
2003
2004 return proc_do_submiturb(ps, &uurb,
2005 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2006 arg);
2007 }
2008
2009 static int processcompl_compat(struct async *as, void __user * __user *arg)
2010 {
2011 struct urb *urb = as->urb;
2012 struct usbdevfs_urb32 __user *userurb = as->userurb;
2013 void __user *addr = as->userurb;
2014 unsigned int i;
2015
2016 if (as->userbuffer && urb->actual_length) {
2017 if (copy_urb_data_to_user(as->userbuffer, urb))
2018 return -EFAULT;
2019 }
2020 if (put_user(as->status, &userurb->status))
2021 return -EFAULT;
2022 if (put_user(urb->actual_length, &userurb->actual_length))
2023 return -EFAULT;
2024 if (put_user(urb->error_count, &userurb->error_count))
2025 return -EFAULT;
2026
2027 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2028 for (i = 0; i < urb->number_of_packets; i++) {
2029 if (put_user(urb->iso_frame_desc[i].actual_length,
2030 &userurb->iso_frame_desc[i].actual_length))
2031 return -EFAULT;
2032 if (put_user(urb->iso_frame_desc[i].status,
2033 &userurb->iso_frame_desc[i].status))
2034 return -EFAULT;
2035 }
2036 }
2037
2038 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2039 return -EFAULT;
2040 return 0;
2041 }
2042
2043 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2044 {
2045 struct async *as = reap_as(ps);
2046
2047 if (as) {
2048 int retval;
2049
2050 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2051 retval = processcompl_compat(as, (void __user * __user *)arg);
2052 free_async(as);
2053 return retval;
2054 }
2055 if (signal_pending(current))
2056 return -EINTR;
2057 return -ENODEV;
2058 }
2059
2060 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2061 {
2062 int retval;
2063 struct async *as;
2064
2065 as = async_getcompleted(ps);
2066 if (as) {
2067 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2068 retval = processcompl_compat(as, (void __user * __user *)arg);
2069 free_async(as);
2070 } else {
2071 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2072 }
2073 return retval;
2074 }
2075
2076
2077 #endif
2078
2079 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2080 {
2081 struct usbdevfs_disconnectsignal ds;
2082
2083 if (copy_from_user(&ds, arg, sizeof(ds)))
2084 return -EFAULT;
2085 ps->discsignr = ds.signr;
2086 ps->disccontext = ds.context;
2087 return 0;
2088 }
2089
2090 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2091 {
2092 unsigned int ifnum;
2093
2094 if (get_user(ifnum, (unsigned int __user *)arg))
2095 return -EFAULT;
2096 return claimintf(ps, ifnum);
2097 }
2098
2099 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2100 {
2101 unsigned int ifnum;
2102 int ret;
2103
2104 if (get_user(ifnum, (unsigned int __user *)arg))
2105 return -EFAULT;
2106 ret = releaseintf(ps, ifnum);
2107 if (ret < 0)
2108 return ret;
2109 destroy_async_on_interface(ps, ifnum);
2110 return 0;
2111 }
2112
2113 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2114 {
2115 int size;
2116 void *buf = NULL;
2117 int retval = 0;
2118 struct usb_interface *intf = NULL;
2119 struct usb_driver *driver = NULL;
2120
2121 if (ps->privileges_dropped)
2122 return -EACCES;
2123
2124 /* alloc buffer */
2125 size = _IOC_SIZE(ctl->ioctl_code);
2126 if (size > 0) {
2127 buf = kmalloc(size, GFP_KERNEL);
2128 if (buf == NULL)
2129 return -ENOMEM;
2130 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2131 if (copy_from_user(buf, ctl->data, size)) {
2132 kfree(buf);
2133 return -EFAULT;
2134 }
2135 } else {
2136 memset(buf, 0, size);
2137 }
2138 }
2139
2140 if (!connected(ps)) {
2141 kfree(buf);
2142 return -ENODEV;
2143 }
2144
2145 if (ps->dev->state != USB_STATE_CONFIGURED)
2146 retval = -EHOSTUNREACH;
2147 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2148 retval = -EINVAL;
2149 else switch (ctl->ioctl_code) {
2150
2151 /* disconnect kernel driver from interface */
2152 case USBDEVFS_DISCONNECT:
2153 if (intf->dev.driver) {
2154 driver = to_usb_driver(intf->dev.driver);
2155 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2156 usb_driver_release_interface(driver, intf);
2157 } else
2158 retval = -ENODATA;
2159 break;
2160
2161 /* let kernel drivers try to (re)bind to the interface */
2162 case USBDEVFS_CONNECT:
2163 if (!intf->dev.driver)
2164 retval = device_attach(&intf->dev);
2165 else
2166 retval = -EBUSY;
2167 break;
2168
2169 /* talk directly to the interface's driver */
2170 default:
2171 if (intf->dev.driver)
2172 driver = to_usb_driver(intf->dev.driver);
2173 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2174 retval = -ENOTTY;
2175 } else {
2176 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2177 if (retval == -ENOIOCTLCMD)
2178 retval = -ENOTTY;
2179 }
2180 }
2181
2182 /* cleanup and return */
2183 if (retval >= 0
2184 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2185 && size > 0
2186 && copy_to_user(ctl->data, buf, size) != 0)
2187 retval = -EFAULT;
2188
2189 kfree(buf);
2190 return retval;
2191 }
2192
2193 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2194 {
2195 struct usbdevfs_ioctl ctrl;
2196
2197 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2198 return -EFAULT;
2199 return proc_ioctl(ps, &ctrl);
2200 }
2201
2202 #ifdef CONFIG_COMPAT
2203 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2204 {
2205 struct usbdevfs_ioctl32 __user *uioc;
2206 struct usbdevfs_ioctl ctrl;
2207 u32 udata;
2208
2209 uioc = compat_ptr((long)arg);
2210 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2211 __get_user(ctrl.ifno, &uioc->ifno) ||
2212 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2213 __get_user(udata, &uioc->data))
2214 return -EFAULT;
2215 ctrl.data = compat_ptr(udata);
2216
2217 return proc_ioctl(ps, &ctrl);
2218 }
2219 #endif
2220
2221 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2222 {
2223 unsigned portnum;
2224 int rc;
2225
2226 if (get_user(portnum, (unsigned __user *) arg))
2227 return -EFAULT;
2228 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2229 if (rc == 0)
2230 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2231 portnum, task_pid_nr(current), current->comm);
2232 return rc;
2233 }
2234
2235 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2236 {
2237 unsigned portnum;
2238
2239 if (get_user(portnum, (unsigned __user *) arg))
2240 return -EFAULT;
2241 return usb_hub_release_port(ps->dev, portnum, ps);
2242 }
2243
2244 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2245 {
2246 __u32 caps;
2247
2248 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2249 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2250 USBDEVFS_CAP_DROP_PRIVILEGES;
2251 if (!ps->dev->bus->no_stop_on_short)
2252 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2253 if (ps->dev->bus->sg_tablesize)
2254 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2255
2256 if (put_user(caps, (__u32 __user *)arg))
2257 return -EFAULT;
2258
2259 return 0;
2260 }
2261
2262 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2263 {
2264 struct usbdevfs_disconnect_claim dc;
2265 struct usb_interface *intf;
2266
2267 if (copy_from_user(&dc, arg, sizeof(dc)))
2268 return -EFAULT;
2269
2270 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2271 if (!intf)
2272 return -EINVAL;
2273
2274 if (intf->dev.driver) {
2275 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2276
2277 if (ps->privileges_dropped)
2278 return -EACCES;
2279
2280 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2281 strncmp(dc.driver, intf->dev.driver->name,
2282 sizeof(dc.driver)) != 0)
2283 return -EBUSY;
2284
2285 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2286 strncmp(dc.driver, intf->dev.driver->name,
2287 sizeof(dc.driver)) == 0)
2288 return -EBUSY;
2289
2290 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2291 usb_driver_release_interface(driver, intf);
2292 }
2293
2294 return claimintf(ps, dc.interface);
2295 }
2296
2297 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2298 {
2299 unsigned num_streams, num_eps;
2300 struct usb_host_endpoint **eps;
2301 struct usb_interface *intf;
2302 int r;
2303
2304 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2305 &eps, &intf);
2306 if (r)
2307 return r;
2308
2309 destroy_async_on_interface(ps,
2310 intf->altsetting[0].desc.bInterfaceNumber);
2311
2312 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2313 kfree(eps);
2314 return r;
2315 }
2316
2317 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2318 {
2319 unsigned num_eps;
2320 struct usb_host_endpoint **eps;
2321 struct usb_interface *intf;
2322 int r;
2323
2324 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2325 if (r)
2326 return r;
2327
2328 destroy_async_on_interface(ps,
2329 intf->altsetting[0].desc.bInterfaceNumber);
2330
2331 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2332 kfree(eps);
2333 return r;
2334 }
2335
2336 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2337 {
2338 u32 data;
2339
2340 if (copy_from_user(&data, arg, sizeof(data)))
2341 return -EFAULT;
2342
2343 /* This is an one way operation. Once privileges are
2344 * dropped, you cannot regain them. You may however reissue
2345 * this ioctl to shrink the allowed interfaces mask.
2346 */
2347 ps->interface_allowed_mask &= data;
2348 ps->privileges_dropped = true;
2349
2350 return 0;
2351 }
2352
2353 /*
2354 * NOTE: All requests here that have interface numbers as parameters
2355 * are assuming that somehow the configuration has been prevented from
2356 * changing. But there's no mechanism to ensure that...
2357 */
2358 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2359 void __user *p)
2360 {
2361 struct usb_dev_state *ps = file->private_data;
2362 struct inode *inode = file_inode(file);
2363 struct usb_device *dev = ps->dev;
2364 int ret = -ENOTTY;
2365
2366 if (!(file->f_mode & FMODE_WRITE))
2367 return -EPERM;
2368
2369 usb_lock_device(dev);
2370
2371 /* Reap operations are allowed even after disconnection */
2372 switch (cmd) {
2373 case USBDEVFS_REAPURB:
2374 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2375 ret = proc_reapurb(ps, p);
2376 goto done;
2377
2378 case USBDEVFS_REAPURBNDELAY:
2379 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2380 ret = proc_reapurbnonblock(ps, p);
2381 goto done;
2382
2383 #ifdef CONFIG_COMPAT
2384 case USBDEVFS_REAPURB32:
2385 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2386 ret = proc_reapurb_compat(ps, p);
2387 goto done;
2388
2389 case USBDEVFS_REAPURBNDELAY32:
2390 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2391 ret = proc_reapurbnonblock_compat(ps, p);
2392 goto done;
2393 #endif
2394 }
2395
2396 if (!connected(ps)) {
2397 usb_unlock_device(dev);
2398 return -ENODEV;
2399 }
2400
2401 switch (cmd) {
2402 case USBDEVFS_CONTROL:
2403 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2404 ret = proc_control(ps, p);
2405 if (ret >= 0)
2406 inode->i_mtime = CURRENT_TIME;
2407 break;
2408
2409 case USBDEVFS_BULK:
2410 snoop(&dev->dev, "%s: BULK\n", __func__);
2411 ret = proc_bulk(ps, p);
2412 if (ret >= 0)
2413 inode->i_mtime = CURRENT_TIME;
2414 break;
2415
2416 case USBDEVFS_RESETEP:
2417 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2418 ret = proc_resetep(ps, p);
2419 if (ret >= 0)
2420 inode->i_mtime = CURRENT_TIME;
2421 break;
2422
2423 case USBDEVFS_RESET:
2424 snoop(&dev->dev, "%s: RESET\n", __func__);
2425 ret = proc_resetdevice(ps);
2426 break;
2427
2428 case USBDEVFS_CLEAR_HALT:
2429 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2430 ret = proc_clearhalt(ps, p);
2431 if (ret >= 0)
2432 inode->i_mtime = CURRENT_TIME;
2433 break;
2434
2435 case USBDEVFS_GETDRIVER:
2436 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2437 ret = proc_getdriver(ps, p);
2438 break;
2439
2440 case USBDEVFS_CONNECTINFO:
2441 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2442 ret = proc_connectinfo(ps, p);
2443 break;
2444
2445 case USBDEVFS_SETINTERFACE:
2446 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2447 ret = proc_setintf(ps, p);
2448 break;
2449
2450 case USBDEVFS_SETCONFIGURATION:
2451 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2452 ret = proc_setconfig(ps, p);
2453 break;
2454
2455 case USBDEVFS_SUBMITURB:
2456 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2457 ret = proc_submiturb(ps, p);
2458 if (ret >= 0)
2459 inode->i_mtime = CURRENT_TIME;
2460 break;
2461
2462 #ifdef CONFIG_COMPAT
2463 case USBDEVFS_CONTROL32:
2464 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2465 ret = proc_control_compat(ps, p);
2466 if (ret >= 0)
2467 inode->i_mtime = CURRENT_TIME;
2468 break;
2469
2470 case USBDEVFS_BULK32:
2471 snoop(&dev->dev, "%s: BULK32\n", __func__);
2472 ret = proc_bulk_compat(ps, p);
2473 if (ret >= 0)
2474 inode->i_mtime = CURRENT_TIME;
2475 break;
2476
2477 case USBDEVFS_DISCSIGNAL32:
2478 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2479 ret = proc_disconnectsignal_compat(ps, p);
2480 break;
2481
2482 case USBDEVFS_SUBMITURB32:
2483 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2484 ret = proc_submiturb_compat(ps, p);
2485 if (ret >= 0)
2486 inode->i_mtime = CURRENT_TIME;
2487 break;
2488
2489 case USBDEVFS_IOCTL32:
2490 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2491 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2492 break;
2493 #endif
2494
2495 case USBDEVFS_DISCARDURB:
2496 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2497 ret = proc_unlinkurb(ps, p);
2498 break;
2499
2500 case USBDEVFS_DISCSIGNAL:
2501 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2502 ret = proc_disconnectsignal(ps, p);
2503 break;
2504
2505 case USBDEVFS_CLAIMINTERFACE:
2506 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2507 ret = proc_claiminterface(ps, p);
2508 break;
2509
2510 case USBDEVFS_RELEASEINTERFACE:
2511 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2512 ret = proc_releaseinterface(ps, p);
2513 break;
2514
2515 case USBDEVFS_IOCTL:
2516 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2517 ret = proc_ioctl_default(ps, p);
2518 break;
2519
2520 case USBDEVFS_CLAIM_PORT:
2521 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2522 ret = proc_claim_port(ps, p);
2523 break;
2524
2525 case USBDEVFS_RELEASE_PORT:
2526 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2527 ret = proc_release_port(ps, p);
2528 break;
2529 case USBDEVFS_GET_CAPABILITIES:
2530 ret = proc_get_capabilities(ps, p);
2531 break;
2532 case USBDEVFS_DISCONNECT_CLAIM:
2533 ret = proc_disconnect_claim(ps, p);
2534 break;
2535 case USBDEVFS_ALLOC_STREAMS:
2536 ret = proc_alloc_streams(ps, p);
2537 break;
2538 case USBDEVFS_FREE_STREAMS:
2539 ret = proc_free_streams(ps, p);
2540 break;
2541 case USBDEVFS_DROP_PRIVILEGES:
2542 ret = proc_drop_privileges(ps, p);
2543 break;
2544 }
2545
2546 done:
2547 usb_unlock_device(dev);
2548 if (ret >= 0)
2549 inode->i_atime = CURRENT_TIME;
2550 return ret;
2551 }
2552
2553 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2554 unsigned long arg)
2555 {
2556 int ret;
2557
2558 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2559
2560 return ret;
2561 }
2562
2563 #ifdef CONFIG_COMPAT
2564 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2565 unsigned long arg)
2566 {
2567 int ret;
2568
2569 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2570
2571 return ret;
2572 }
2573 #endif
2574
2575 /* No kernel lock - fine */
2576 static unsigned int usbdev_poll(struct file *file,
2577 struct poll_table_struct *wait)
2578 {
2579 struct usb_dev_state *ps = file->private_data;
2580 unsigned int mask = 0;
2581
2582 poll_wait(file, &ps->wait, wait);
2583 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2584 mask |= POLLOUT | POLLWRNORM;
2585 if (!connected(ps))
2586 mask |= POLLHUP;
2587 if (list_empty(&ps->list))
2588 mask |= POLLERR;
2589 return mask;
2590 }
2591
2592 const struct file_operations usbdev_file_operations = {
2593 .owner = THIS_MODULE,
2594 .llseek = no_seek_end_llseek,
2595 .read = usbdev_read,
2596 .poll = usbdev_poll,
2597 .unlocked_ioctl = usbdev_ioctl,
2598 #ifdef CONFIG_COMPAT
2599 .compat_ioctl = usbdev_compat_ioctl,
2600 #endif
2601 .mmap = usbdev_mmap,
2602 .open = usbdev_open,
2603 .release = usbdev_release,
2604 };
2605
2606 static void usbdev_remove(struct usb_device *udev)
2607 {
2608 struct usb_dev_state *ps;
2609 struct siginfo sinfo;
2610
2611 while (!list_empty(&udev->filelist)) {
2612 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2613 destroy_all_async(ps);
2614 wake_up_all(&ps->wait);
2615 list_del_init(&ps->list);
2616 if (ps->discsignr) {
2617 memset(&sinfo, 0, sizeof(sinfo));
2618 sinfo.si_signo = ps->discsignr;
2619 sinfo.si_errno = EPIPE;
2620 sinfo.si_code = SI_ASYNCIO;
2621 sinfo.si_addr = ps->disccontext;
2622 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2623 ps->disc_pid, ps->cred, ps->secid);
2624 }
2625 }
2626 }
2627
2628 static int usbdev_notify(struct notifier_block *self,
2629 unsigned long action, void *dev)
2630 {
2631 switch (action) {
2632 case USB_DEVICE_ADD:
2633 break;
2634 case USB_DEVICE_REMOVE:
2635 usbdev_remove(dev);
2636 break;
2637 }
2638 return NOTIFY_OK;
2639 }
2640
2641 static struct notifier_block usbdev_nb = {
2642 .notifier_call = usbdev_notify,
2643 };
2644
2645 static struct cdev usb_device_cdev;
2646
2647 int __init usb_devio_init(void)
2648 {
2649 int retval;
2650
2651 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2652 "usb_device");
2653 if (retval) {
2654 printk(KERN_ERR "Unable to register minors for usb_device\n");
2655 goto out;
2656 }
2657 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2658 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2659 if (retval) {
2660 printk(KERN_ERR "Unable to get usb_device major %d\n",
2661 USB_DEVICE_MAJOR);
2662 goto error_cdev;
2663 }
2664 usb_register_notify(&usbdev_nb);
2665 out:
2666 return retval;
2667
2668 error_cdev:
2669 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2670 goto out;
2671 }
2672
2673 void usb_devio_cleanup(void)
2674 {
2675 usb_unregister_notify(&usbdev_nb);
2676 cdev_del(&usb_device_cdev);
2677 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2678 }