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/smp_lock.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "hcd.h"        /* for usbcore internals */
  54 #include "usb.h"
  55 #include "hub.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59
  60 /* Mutual exclusion for removal, open, and release */
  61 DEFINE_MUTEX(usbfs_mutex);
  62
  63 struct dev_state {
  64         struct list_head list;      /* state list */
  65         struct usb_device *dev;
  66         struct file *file;
  67         spinlock_t lock;            /* protects the async urb lists */
  68         struct list_head async_pending;
  69         struct list_head async_completed;
  70         wait_queue_head_t wait;     /* wake up if a request completed */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         uid_t disc_uid, disc_euid;
  74         void __user *disccontext;
  75         unsigned long ifclaimed;
  76         u32 secid;
  77         u32 disabled_bulk_eps;
  78 };
  79
  80 struct async {
  81         struct list_head asynclist;
  82         struct dev_state *ps;
  83         struct pid *pid;
  84         uid_t uid, euid;
  85         unsigned int signr;
  86         unsigned int ifnum;
  87         void __user *userbuffer;
  88         void __user *userurb;
  89         struct urb *urb;
  90         int status;
  91         u32 secid;
  92         u8 bulk_addr;
  93         u8 bulk_status;
  94 };
  95
  96 static int usbfs_snoop;
  97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  99
 100 #define snoop(dev, format, arg...)                              \
 101         do {                                                    \
 102                 if (usbfs_snoop)                                \
 103                         dev_info(dev , format , ## arg);        \
 104         } while (0)
 105
 106 enum snoop_when {
 107         SUBMIT, COMPLETE
 108 };
 109
 110 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 111
 112 #define MAX_USBFS_BUFFER_SIZE   16384
 113
 114
 115 static int connected(struct dev_state *ps)
 116 {
 117         return (!list_empty(&ps->list) &&
 118                         ps->dev->state != USB_STATE_NOTATTACHED);
 119 }
 120
 121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 122 {
 123         loff_t ret;
 124
 125         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 126
 127         switch (orig) {
 128         case 0:
 129                 file->f_pos = offset;
 130                 ret = file->f_pos;
 131                 break;
 132         case 1:
 133                 file->f_pos += offset;
 134                 ret = file->f_pos;
 135                 break;
 136         case 2:
 137         default:
 138                 ret = -EINVAL;
 139         }
 140
 141         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 142         return ret;
 143 }
 144
 145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 146                            loff_t *ppos)
 147 {
 148         struct dev_state *ps = file->private_data;
 149         struct usb_device *dev = ps->dev;
 150         ssize_t ret = 0;
 151         unsigned len;
 152         loff_t pos;
 153         int i;
 154
 155         pos = *ppos;
 156         usb_lock_device(dev);
 157         if (!connected(ps)) {
 158                 ret = -ENODEV;
 159                 goto err;
 160         } else if (pos < 0) {
 161                 ret = -EINVAL;
 162                 goto err;
 163         }
 164
 165         if (pos < sizeof(struct usb_device_descriptor)) {
 166                 /* 18 bytes - fits on the stack */
 167                 struct usb_device_descriptor temp_desc;
 168
 169                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 170                 le16_to_cpus(&temp_desc.bcdUSB);
 171                 le16_to_cpus(&temp_desc.idVendor);
 172                 le16_to_cpus(&temp_desc.idProduct);
 173                 le16_to_cpus(&temp_desc.bcdDevice);
 174
 175                 len = sizeof(struct usb_device_descriptor) - pos;
 176                 if (len > nbytes)
 177                         len = nbytes;
 178                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 179                         ret = -EFAULT;
 180                         goto err;
 181                 }
 182
 183                 *ppos += len;
 184                 buf += len;
 185                 nbytes -= len;
 186                 ret += len;
 187         }
 188
 189         pos = sizeof(struct usb_device_descriptor);
 190         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 191                 struct usb_config_descriptor *config =
 192                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 193                 unsigned int length = le16_to_cpu(config->wTotalLength);
 194
 195                 if (*ppos < pos + length) {
 196
 197                         /* The descriptor may claim to be longer than it
 198                          * really is.  Here is the actual allocated length. */
 199                         unsigned alloclen =
 200                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 201
 202                         len = length - (*ppos - pos);
 203                         if (len > nbytes)
 204                                 len = nbytes;
 205
 206                         /* Simply don't write (skip over) unallocated parts */
 207                         if (alloclen > (*ppos - pos)) {
 208                                 alloclen -= (*ppos - pos);
 209                                 if (copy_to_user(buf,
 210                                     dev->rawdescriptors[i] + (*ppos - pos),
 211                                     min(len, alloclen))) {
 212                                         ret = -EFAULT;
 213                                         goto err;
 214                                 }
 215                         }
 216
 217                         *ppos += len;
 218                         buf += len;
 219                         nbytes -= len;
 220                         ret += len;
 221                 }
 222
 223                 pos += length;
 224         }
 225
 226 err:
 227         usb_unlock_device(dev);
 228         return ret;
 229 }
 230
 231 /*
 232  * async list handling
 233  */
 234
 235 static struct async *alloc_async(unsigned int numisoframes)
 236 {
 237         struct async *as;
 238
 239         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 240         if (!as)
 241                 return NULL;
 242         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 243         if (!as->urb) {
 244                 kfree(as);
 245                 return NULL;
 246         }
 247         return as;
 248 }
 249
 250 static void free_async(struct async *as)
 251 {
 252         put_pid(as->pid);
 253         kfree(as->urb->transfer_buffer);
 254         kfree(as->urb->setup_packet);
 255         usb_free_urb(as->urb);
 256         kfree(as);
 257 }
 258
 259 static void async_newpending(struct async *as)
 260 {
 261         struct dev_state *ps = as->ps;
 262         unsigned long flags;
 263
 264         spin_lock_irqsave(&ps->lock, flags);
 265         list_add_tail(&as->asynclist, &ps->async_pending);
 266         spin_unlock_irqrestore(&ps->lock, flags);
 267 }
 268
 269 static void async_removepending(struct async *as)
 270 {
 271         struct dev_state *ps = as->ps;
 272         unsigned long flags;
 273
 274         spin_lock_irqsave(&ps->lock, flags);
 275         list_del_init(&as->asynclist);
 276         spin_unlock_irqrestore(&ps->lock, flags);
 277 }
 278
 279 static struct async *async_getcompleted(struct dev_state *ps)
 280 {
 281         unsigned long flags;
 282         struct async *as = NULL;
 283
 284         spin_lock_irqsave(&ps->lock, flags);
 285         if (!list_empty(&ps->async_completed)) {
 286                 as = list_entry(ps->async_completed.next, struct async,
 287                                 asynclist);
 288                 list_del_init(&as->asynclist);
 289         }
 290         spin_unlock_irqrestore(&ps->lock, flags);
 291         return as;
 292 }
 293
 294 static struct async *async_getpending(struct dev_state *ps,
 295                                              void __user *userurb)
 296 {
 297         unsigned long flags;
 298         struct async *as;
 299
 300         spin_lock_irqsave(&ps->lock, flags);
 301         list_for_each_entry(as, &ps->async_pending, asynclist)
 302                 if (as->userurb == userurb) {
 303                         list_del_init(&as->asynclist);
 304                         spin_unlock_irqrestore(&ps->lock, flags);
 305                         return as;
 306                 }
 307         spin_unlock_irqrestore(&ps->lock, flags);
 308         return NULL;
 309 }
 310
 311 static void snoop_urb(struct usb_device *udev,
 312                 void __user *userurb, int pipe, unsigned length,
 313                 int timeout_or_status, enum snoop_when when)
 314 {
 315         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 316         static const char *dirs[] = {"out", "in"};
 317         int ep;
 318         const char *t, *d;
 319
 320         if (!usbfs_snoop)
 321                 return;
 322
 323         ep = usb_pipeendpoint(pipe);
 324         t = types[usb_pipetype(pipe)];
 325         d = dirs[!!usb_pipein(pipe)];
 326
 327         if (userurb) {          /* Async */
 328                 if (when == SUBMIT)
 329                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 330                                         "length %u\n",
 331                                         userurb, ep, t, d, length);
 332                 else
 333                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 334                                         "actual_length %u status %d\n",
 335                                         userurb, ep, t, d, length,
 336                                         timeout_or_status);
 337         } else {
 338                 if (when == SUBMIT)
 339                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 340                                         "timeout %d\n",
 341                                         ep, t, d, length, timeout_or_status);
 342                 else
 343                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 344                                         "status %d\n",
 345                                         ep, t, d, length, timeout_or_status);
 346         }
 347 }
 348
 349 #define AS_CONTINUATION 1
 350 #define AS_UNLINK       2
 351
 352 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 353 __releases(ps->lock)
 354 __acquires(ps->lock)
 355 {
 356         struct async *as;
 357
 358         /* Mark all the pending URBs that match bulk_addr, up to but not
 359          * including the first one without AS_CONTINUATION.  If such an
 360          * URB is encountered then a new transfer has already started so
 361          * the endpoint doesn't need to be disabled; otherwise it does.
 362          */
 363         list_for_each_entry(as, &ps->async_pending, asynclist) {
 364                 if (as->bulk_addr == bulk_addr) {
 365                         if (as->bulk_status != AS_CONTINUATION)
 366                                 goto rescan;
 367                         as->bulk_status = AS_UNLINK;
 368                         as->bulk_addr = 0;
 369                 }
 370         }
 371         ps->disabled_bulk_eps |= (1 << bulk_addr);
 372
 373         /* Now carefully unlink all the marked pending URBs */
 374  rescan:
 375         list_for_each_entry(as, &ps->async_pending, asynclist) {
 376                 if (as->bulk_status == AS_UNLINK) {
 377                         as->bulk_status = 0;            /* Only once */
 378                         spin_unlock(&ps->lock);         /* Allow completions */
 379                         usb_unlink_urb(as->urb);
 380                         spin_lock(&ps->lock);
 381                         goto rescan;
 382                 }
 383         }
 384 }
 385
 386 static void async_completed(struct urb *urb)
 387 {
 388         struct async *as = urb->context;
 389         struct dev_state *ps = as->ps;
 390         struct siginfo sinfo;
 391         struct pid *pid = NULL;
 392         uid_t uid = 0;
 393         uid_t euid = 0;
 394         u32 secid = 0;
 395         int signr;
 396
 397         spin_lock(&ps->lock);
 398         list_move_tail(&as->asynclist, &ps->async_completed);
 399         as->status = urb->status;
 400         signr = as->signr;
 401         if (signr) {
 402                 sinfo.si_signo = as->signr;
 403                 sinfo.si_errno = as->status;
 404                 sinfo.si_code = SI_ASYNCIO;
 405                 sinfo.si_addr = as->userurb;
 406                 pid = as->pid;
 407                 uid = as->uid;
 408                 euid = as->euid;
 409                 secid = as->secid;
 410         }
 411         snoop(&urb->dev->dev, "urb complete\n");
 412         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 413                         as->status, COMPLETE);
 414         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 415                         as->status != -ENOENT)
 416                 cancel_bulk_urbs(ps, as->bulk_addr);
 417         spin_unlock(&ps->lock);
 418
 419         if (signr)
 420                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 421                                       euid, secid);
 422
 423         wake_up(&ps->wait);
 424 }
 425
 426 static void destroy_async(struct dev_state *ps, struct list_head *list)
 427 {
 428         struct async *as;
 429         unsigned long flags;
 430
 431         spin_lock_irqsave(&ps->lock, flags);
 432         while (!list_empty(list)) {
 433                 as = list_entry(list->next, struct async, asynclist);
 434                 list_del_init(&as->asynclist);
 435
 436                 /* drop the spinlock so the completion handler can run */
 437                 spin_unlock_irqrestore(&ps->lock, flags);
 438                 usb_kill_urb(as->urb);
 439                 spin_lock_irqsave(&ps->lock, flags);
 440         }
 441         spin_unlock_irqrestore(&ps->lock, flags);
 442 }
 443
 444 static void destroy_async_on_interface(struct dev_state *ps,
 445                                        unsigned int ifnum)
 446 {
 447         struct list_head *p, *q, hitlist;
 448         unsigned long flags;
 449
 450         INIT_LIST_HEAD(&hitlist);
 451         spin_lock_irqsave(&ps->lock, flags);
 452         list_for_each_safe(p, q, &ps->async_pending)
 453                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 454                         list_move_tail(p, &hitlist);
 455         spin_unlock_irqrestore(&ps->lock, flags);
 456         destroy_async(ps, &hitlist);
 457 }
 458
 459 static void destroy_all_async(struct dev_state *ps)
 460 {
 461         destroy_async(ps, &ps->async_pending);
 462 }
 463
 464 /*
 465  * interface claims are made only at the request of user level code,
 466  * which can also release them (explicitly or by closing files).
 467  * they're also undone when devices disconnect.
 468  */
 469
 470 static int driver_probe(struct usb_interface *intf,
 471                         const struct usb_device_id *id)
 472 {
 473         return -ENODEV;
 474 }
 475
 476 static void driver_disconnect(struct usb_interface *intf)
 477 {
 478         struct dev_state *ps = usb_get_intfdata(intf);
 479         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 480
 481         if (!ps)
 482                 return;
 483
 484         /* NOTE:  this relies on usbcore having canceled and completed
 485          * all pending I/O requests; 2.6 does that.
 486          */
 487
 488         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 489                 clear_bit(ifnum, &ps->ifclaimed);
 490         else
 491                 dev_warn(&intf->dev, "interface number %u out of range\n",
 492                          ifnum);
 493
 494         usb_set_intfdata(intf, NULL);
 495
 496         /* force async requests to complete */
 497         destroy_async_on_interface(ps, ifnum);
 498 }
 499
 500 /* The following routines are merely placeholders.  There is no way
 501  * to inform a user task about suspend or resumes.
 502  */
 503 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 504 {
 505         return 0;
 506 }
 507
 508 static int driver_resume(struct usb_interface *intf)
 509 {
 510         return 0;
 511 }
 512
 513 struct usb_driver usbfs_driver = {
 514         .name =         "usbfs",
 515         .probe =        driver_probe,
 516         .disconnect =   driver_disconnect,
 517         .suspend =      driver_suspend,
 518         .resume =       driver_resume,
 519 };
 520
 521 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 522 {
 523         struct usb_device *dev = ps->dev;
 524         struct usb_interface *intf;
 525         int err;
 526
 527         if (ifnum >= 8*sizeof(ps->ifclaimed))
 528                 return -EINVAL;
 529         /* already claimed */
 530         if (test_bit(ifnum, &ps->ifclaimed))
 531                 return 0;
 532
 533         intf = usb_ifnum_to_if(dev, ifnum);
 534         if (!intf)
 535                 err = -ENOENT;
 536         else
 537                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 538         if (err == 0)
 539                 set_bit(ifnum, &ps->ifclaimed);
 540         return err;
 541 }
 542
 543 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 544 {
 545         struct usb_device *dev;
 546         struct usb_interface *intf;
 547         int err;
 548
 549         err = -EINVAL;
 550         if (ifnum >= 8*sizeof(ps->ifclaimed))
 551                 return err;
 552         dev = ps->dev;
 553         intf = usb_ifnum_to_if(dev, ifnum);
 554         if (!intf)
 555                 err = -ENOENT;
 556         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 557                 usb_driver_release_interface(&usbfs_driver, intf);
 558                 err = 0;
 559         }
 560         return err;
 561 }
 562
 563 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 564 {
 565         if (ps->dev->state != USB_STATE_CONFIGURED)
 566                 return -EHOSTUNREACH;
 567         if (ifnum >= 8*sizeof(ps->ifclaimed))
 568                 return -EINVAL;
 569         if (test_bit(ifnum, &ps->ifclaimed))
 570                 return 0;
 571         /* if not yet claimed, claim it for the driver */
 572         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 573                  "interface %u before use\n", task_pid_nr(current),
 574                  current->comm, ifnum);
 575         return claimintf(ps, ifnum);
 576 }
 577
 578 static int findintfep(struct usb_device *dev, unsigned int ep)
 579 {
 580         unsigned int i, j, e;
 581         struct usb_interface *intf;
 582         struct usb_host_interface *alts;
 583         struct usb_endpoint_descriptor *endpt;
 584
 585         if (ep & ~(USB_DIR_IN|0xf))
 586                 return -EINVAL;
 587         if (!dev->actconfig)
 588                 return -ESRCH;
 589         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 590                 intf = dev->actconfig->interface[i];
 591                 for (j = 0; j < intf->num_altsetting; j++) {
 592                         alts = &intf->altsetting[j];
 593                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 594                                 endpt = &alts->endpoint[e].desc;
 595                                 if (endpt->bEndpointAddress == ep)
 596                                         return alts->desc.bInterfaceNumber;
 597                         }
 598                 }
 599         }
 600         return -ENOENT;
 601 }
 602
 603 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 604                            unsigned int index)
 605 {
 606         int ret = 0;
 607
 608         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 609          && ps->dev->state != USB_STATE_ADDRESS
 610          && ps->dev->state != USB_STATE_CONFIGURED)
 611                 return -EHOSTUNREACH;
 612         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 613                 return 0;
 614
 615         index &= 0xff;
 616         switch (requesttype & USB_RECIP_MASK) {
 617         case USB_RECIP_ENDPOINT:
 618                 ret = findintfep(ps->dev, index);
 619                 if (ret >= 0)
 620                         ret = checkintf(ps, ret);
 621                 break;
 622
 623         case USB_RECIP_INTERFACE:
 624                 ret = checkintf(ps, index);
 625                 break;
 626         }
 627         return ret;
 628 }
 629
 630 static int match_devt(struct device *dev, void *data)
 631 {
 632         return dev->devt == (dev_t) (unsigned long) data;
 633 }
 634
 635 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 636 {
 637         struct device *dev;
 638
 639         dev = bus_find_device(&usb_bus_type, NULL,
 640                               (void *) (unsigned long) devt, match_devt);
 641         if (!dev)
 642                 return NULL;
 643         return container_of(dev, struct usb_device, dev);
 644 }
 645
 646 /*
 647  * file operations
 648  */
 649 static int usbdev_open(struct inode *inode, struct file *file)
 650 {
 651         struct usb_device *dev = NULL;
 652         struct dev_state *ps;
 653         const struct cred *cred = current_cred();
 654         int ret;
 655
 656         ret = -ENOMEM;
 657         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 658         if (!ps)
 659                 goto out_free_ps;
 660
 661         ret = -ENODEV;
 662
 663         /* Protect against simultaneous removal or release */
 664         mutex_lock(&usbfs_mutex);
 665
 666         /* usbdev device-node */
 667         if (imajor(inode) == USB_DEVICE_MAJOR)
 668                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 669
 670 #ifdef CONFIG_USB_DEVICEFS
 671         /* procfs file */
 672         if (!dev) {
 673                 dev = inode->i_private;
 674                 if (dev && dev->usbfs_dentry &&
 675                                         dev->usbfs_dentry->d_inode == inode)
 676                         usb_get_dev(dev);
 677                 else
 678                         dev = NULL;
 679         }
 680 #endif
 681         mutex_unlock(&usbfs_mutex);
 682
 683         if (!dev)
 684                 goto out_free_ps;
 685
 686         usb_lock_device(dev);
 687         if (dev->state == USB_STATE_NOTATTACHED)
 688                 goto out_unlock_device;
 689
 690         ret = usb_autoresume_device(dev);
 691         if (ret)
 692                 goto out_unlock_device;
 693
 694         ps->dev = dev;
 695         ps->file = file;
 696         spin_lock_init(&ps->lock);
 697         INIT_LIST_HEAD(&ps->list);
 698         INIT_LIST_HEAD(&ps->async_pending);
 699         INIT_LIST_HEAD(&ps->async_completed);
 700         init_waitqueue_head(&ps->wait);
 701         ps->discsignr = 0;
 702         ps->disc_pid = get_pid(task_pid(current));
 703         ps->disc_uid = cred->uid;
 704         ps->disc_euid = cred->euid;
 705         ps->disccontext = NULL;
 706         ps->ifclaimed = 0;
 707         security_task_getsecid(current, &ps->secid);
 708         smp_wmb();
 709         list_add_tail(&ps->list, &dev->filelist);
 710         file->private_data = ps;
 711         usb_unlock_device(dev);
 712         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 713                         current->comm);
 714         return ret;
 715
 716  out_unlock_device:
 717         usb_unlock_device(dev);
 718         usb_put_dev(dev);
 719  out_free_ps:
 720         kfree(ps);
 721         return ret;
 722 }
 723
 724 static int usbdev_release(struct inode *inode, struct file *file)
 725 {
 726         struct dev_state *ps = file->private_data;
 727         struct usb_device *dev = ps->dev;
 728         unsigned int ifnum;
 729         struct async *as;
 730
 731         usb_lock_device(dev);
 732         usb_hub_release_all_ports(dev, ps);
 733
 734         list_del_init(&ps->list);
 735
 736         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 737                         ifnum++) {
 738                 if (test_bit(ifnum, &ps->ifclaimed))
 739                         releaseintf(ps, ifnum);
 740         }
 741         destroy_all_async(ps);
 742         usb_autosuspend_device(dev);
 743         usb_unlock_device(dev);
 744         usb_put_dev(dev);
 745         put_pid(ps->disc_pid);
 746
 747         as = async_getcompleted(ps);
 748         while (as) {
 749                 free_async(as);
 750                 as = async_getcompleted(ps);
 751         }
 752         kfree(ps);
 753         return 0;
 754 }
 755
 756 static int proc_control(struct dev_state *ps, void __user *arg)
 757 {
 758         struct usb_device *dev = ps->dev;
 759         struct usbdevfs_ctrltransfer ctrl;
 760         unsigned int tmo;
 761         unsigned char *tbuf;
 762         unsigned wLength;
 763         int i, pipe, ret;
 764
 765         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 766                 return -EFAULT;
 767         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 768         if (ret)
 769                 return ret;
 770         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 771         if (wLength > PAGE_SIZE)
 772                 return -EINVAL;
 773         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 774         if (!tbuf)
 775                 return -ENOMEM;
 776         tmo = ctrl.timeout;
 777         if (ctrl.bRequestType & 0x80) {
 778                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 779                                                ctrl.wLength)) {
 780                         free_page((unsigned long)tbuf);
 781                         return -EINVAL;
 782                 }
 783                 pipe = usb_rcvctrlpipe(dev, 0);
 784                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 785
 786                 usb_unlock_device(dev);
 787                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 788                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 789                                     tbuf, ctrl.wLength, tmo);
 790                 usb_lock_device(dev);
 791                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 792
 793                 if ((i > 0) && ctrl.wLength) {
 794                         if (copy_to_user(ctrl.data, tbuf, i)) {
 795                                 free_page((unsigned long)tbuf);
 796                                 return -EFAULT;
 797                         }
 798                 }
 799         } else {
 800                 if (ctrl.wLength) {
 801                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 802                                 free_page((unsigned long)tbuf);
 803                                 return -EFAULT;
 804                         }
 805                 }
 806                 pipe = usb_sndctrlpipe(dev, 0);
 807                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
 808
 809                 usb_unlock_device(dev);
 810                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 811                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 812                                     tbuf, ctrl.wLength, tmo);
 813                 usb_lock_device(dev);
 814                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
 815         }
 816         free_page((unsigned long)tbuf);
 817         if (i < 0 && i != -EPIPE) {
 818                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 819                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 820                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 821                            ctrl.wLength, i);
 822         }
 823         return i;
 824 }
 825
 826 static int proc_bulk(struct dev_state *ps, void __user *arg)
 827 {
 828         struct usb_device *dev = ps->dev;
 829         struct usbdevfs_bulktransfer bulk;
 830         unsigned int tmo, len1, pipe;
 831         int len2;
 832         unsigned char *tbuf;
 833         int i, ret;
 834
 835         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 836                 return -EFAULT;
 837         ret = findintfep(ps->dev, bulk.ep);
 838         if (ret < 0)
 839                 return ret;
 840         ret = checkintf(ps, ret);
 841         if (ret)
 842                 return ret;
 843         if (bulk.ep & USB_DIR_IN)
 844                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 845         else
 846                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 847         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 848                 return -EINVAL;
 849         len1 = bulk.len;
 850         if (len1 > MAX_USBFS_BUFFER_SIZE)
 851                 return -EINVAL;
 852         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 853                 return -ENOMEM;
 854         tmo = bulk.timeout;
 855         if (bulk.ep & 0x80) {
 856                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 857                         kfree(tbuf);
 858                         return -EINVAL;
 859                 }
 860                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 861
 862                 usb_unlock_device(dev);
 863                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 864                 usb_lock_device(dev);
 865                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 866
 867                 if (!i && len2) {
 868                         if (copy_to_user(bulk.data, tbuf, len2)) {
 869                                 kfree(tbuf);
 870                                 return -EFAULT;
 871                         }
 872                 }
 873         } else {
 874                 if (len1) {
 875                         if (copy_from_user(tbuf, bulk.data, len1)) {
 876                                 kfree(tbuf);
 877                                 return -EFAULT;
 878                         }
 879                 }
 880                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
 881
 882                 usb_unlock_device(dev);
 883                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 884                 usb_lock_device(dev);
 885                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
 886         }
 887         kfree(tbuf);
 888         if (i < 0)
 889                 return i;
 890         return len2;
 891 }
 892
 893 static int proc_resetep(struct dev_state *ps, void __user *arg)
 894 {
 895         unsigned int ep;
 896         int ret;
 897
 898         if (get_user(ep, (unsigned int __user *)arg))
 899                 return -EFAULT;
 900         ret = findintfep(ps->dev, ep);
 901         if (ret < 0)
 902                 return ret;
 903         ret = checkintf(ps, ret);
 904         if (ret)
 905                 return ret;
 906         usb_reset_endpoint(ps->dev, ep);
 907         return 0;
 908 }
 909
 910 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 911 {
 912         unsigned int ep;
 913         int pipe;
 914         int ret;
 915
 916         if (get_user(ep, (unsigned int __user *)arg))
 917                 return -EFAULT;
 918         ret = findintfep(ps->dev, ep);
 919         if (ret < 0)
 920                 return ret;
 921         ret = checkintf(ps, ret);
 922         if (ret)
 923                 return ret;
 924         if (ep & USB_DIR_IN)
 925                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 926         else
 927                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 928
 929         return usb_clear_halt(ps->dev, pipe);
 930 }
 931
 932 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 933 {
 934         struct usbdevfs_getdriver gd;
 935         struct usb_interface *intf;
 936         int ret;
 937
 938         if (copy_from_user(&gd, arg, sizeof(gd)))
 939                 return -EFAULT;
 940         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 941         if (!intf || !intf->dev.driver)
 942                 ret = -ENODATA;
 943         else {
 944                 strncpy(gd.driver, intf->dev.driver->name,
 945                                 sizeof(gd.driver));
 946                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 947         }
 948         return ret;
 949 }
 950
 951 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 952 {
 953         struct usbdevfs_connectinfo ci;
 954
 955         ci.devnum = ps->dev->devnum;
 956         ci.slow = ps->dev->speed == USB_SPEED_LOW;
 957         if (copy_to_user(arg, &ci, sizeof(ci)))
 958                 return -EFAULT;
 959         return 0;
 960 }
 961
 962 static int proc_resetdevice(struct dev_state *ps)
 963 {
 964         return usb_reset_device(ps->dev);
 965 }
 966
 967 static int proc_setintf(struct dev_state *ps, void __user *arg)
 968 {
 969         struct usbdevfs_setinterface setintf;
 970         int ret;
 971
 972         if (copy_from_user(&setintf, arg, sizeof(setintf)))
 973                 return -EFAULT;
 974         if ((ret = checkintf(ps, setintf.interface)))
 975                 return ret;
 976         return usb_set_interface(ps->dev, setintf.interface,
 977                         setintf.altsetting);
 978 }
 979
 980 static int proc_setconfig(struct dev_state *ps, void __user *arg)
 981 {
 982         int u;
 983         int status = 0;
 984         struct usb_host_config *actconfig;
 985
 986         if (get_user(u, (int __user *)arg))
 987                 return -EFAULT;
 988
 989         actconfig = ps->dev->actconfig;
 990
 991         /* Don't touch the device if any interfaces are claimed.
 992          * It could interfere with other drivers' operations, and if
 993          * an interface is claimed by usbfs it could easily deadlock.
 994          */
 995         if (actconfig) {
 996                 int i;
 997
 998                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
 999                         if (usb_interface_claimed(actconfig->interface[i])) {
1000                                 dev_warn(&ps->dev->dev,
1001                                         "usbfs: interface %d claimed by %s "
1002                                         "while '%s' sets config #%d\n",
1003                                         actconfig->interface[i]
1004                                                 ->cur_altsetting
1005                                                 ->desc.bInterfaceNumber,
1006                                         actconfig->interface[i]
1007                                                 ->dev.driver->name,
1008                                         current->comm, u);
1009                                 status = -EBUSY;
1010                                 break;
1011                         }
1012                 }
1013         }
1014
1015         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1016          * so avoid usb_set_configuration()'s kick to sysfs
1017          */
1018         if (status == 0) {
1019                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1020                         status = usb_reset_configuration(ps->dev);
1021                 else
1022                         status = usb_set_configuration(ps->dev, u);
1023         }
1024
1025         return status;
1026 }
1027
1028 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1029                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1030                         void __user *arg)
1031 {
1032         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1033         struct usb_host_endpoint *ep;
1034         struct async *as;
1035         struct usb_ctrlrequest *dr = NULL;
1036         const struct cred *cred = current_cred();
1037         unsigned int u, totlen, isofrmlen;
1038         int ret, ifnum = -1;
1039         int is_in;
1040
1041         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1042                                 USBDEVFS_URB_SHORT_NOT_OK |
1043                                 USBDEVFS_URB_BULK_CONTINUATION |
1044                                 USBDEVFS_URB_NO_FSBR |
1045                                 USBDEVFS_URB_ZERO_PACKET |
1046                                 USBDEVFS_URB_NO_INTERRUPT))
1047                 return -EINVAL;
1048         if (uurb->buffer_length > 0 && !uurb->buffer)
1049                 return -EINVAL;
1050         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1051             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1052                 ifnum = findintfep(ps->dev, uurb->endpoint);
1053                 if (ifnum < 0)
1054                         return ifnum;
1055                 ret = checkintf(ps, ifnum);
1056                 if (ret)
1057                         return ret;
1058         }
1059         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1060                 is_in = 1;
1061                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1062         } else {
1063                 is_in = 0;
1064                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1065         }
1066         if (!ep)
1067                 return -ENOENT;
1068         switch(uurb->type) {
1069         case USBDEVFS_URB_TYPE_CONTROL:
1070                 if (!usb_endpoint_xfer_control(&ep->desc))
1071                         return -EINVAL;
1072                 /* min 8 byte setup packet,
1073                  * max 8 byte setup plus an arbitrary data stage */
1074                 if (uurb->buffer_length < 8 ||
1075                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1076                         return -EINVAL;
1077                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1078                 if (!dr)
1079                         return -ENOMEM;
1080                 if (copy_from_user(dr, uurb->buffer, 8)) {
1081                         kfree(dr);
1082                         return -EFAULT;
1083                 }
1084                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1085                         kfree(dr);
1086                         return -EINVAL;
1087                 }
1088                 ret = check_ctrlrecip(ps, dr->bRequestType,
1089                                       le16_to_cpup(&dr->wIndex));
1090                 if (ret) {
1091                         kfree(dr);
1092                         return ret;
1093                 }
1094                 uurb->number_of_packets = 0;
1095                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1096                 uurb->buffer += 8;
1097                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1098                         is_in = 1;
1099                         uurb->endpoint |= USB_DIR_IN;
1100                 } else {
1101                         is_in = 0;
1102                         uurb->endpoint &= ~USB_DIR_IN;
1103                 }
1104                 break;
1105
1106         case USBDEVFS_URB_TYPE_BULK:
1107                 switch (usb_endpoint_type(&ep->desc)) {
1108                 case USB_ENDPOINT_XFER_CONTROL:
1109                 case USB_ENDPOINT_XFER_ISOC:
1110                         return -EINVAL;
1111                 case USB_ENDPOINT_XFER_INT:
1112                         /* allow single-shot interrupt transfers */
1113                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1114                         goto interrupt_urb;
1115                 }
1116                 uurb->number_of_packets = 0;
1117                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1118                         return -EINVAL;
1119                 break;
1120
1121         case USBDEVFS_URB_TYPE_INTERRUPT:
1122                 if (!usb_endpoint_xfer_int(&ep->desc))
1123                         return -EINVAL;
1124  interrupt_urb:
1125                 uurb->number_of_packets = 0;
1126                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1127                         return -EINVAL;
1128                 break;
1129
1130         case USBDEVFS_URB_TYPE_ISO:
1131                 /* arbitrary limit */
1132                 if (uurb->number_of_packets < 1 ||
1133                     uurb->number_of_packets > 128)
1134                         return -EINVAL;
1135                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1136                         return -EINVAL;
1137                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1138                                    uurb->number_of_packets;
1139                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1140                         return -ENOMEM;
1141                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1142                         kfree(isopkt);
1143                         return -EFAULT;
1144                 }
1145                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1146                         /* arbitrary limit,
1147                          * sufficient for USB 2.0 high-bandwidth iso */
1148                         if (isopkt[u].length > 8192) {
1149                                 kfree(isopkt);
1150                                 return -EINVAL;
1151                         }
1152                         totlen += isopkt[u].length;
1153                 }
1154                 /* 3072 * 64 microframes */
1155                 if (totlen > 196608) {
1156                         kfree(isopkt);
1157                         return -EINVAL;
1158                 }
1159                 uurb->buffer_length = totlen;
1160                 break;
1161
1162         default:
1163                 return -EINVAL;
1164         }
1165         if (uurb->buffer_length > 0 &&
1166                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1167                                 uurb->buffer, uurb->buffer_length)) {
1168                 kfree(isopkt);
1169                 kfree(dr);
1170                 return -EFAULT;
1171         }
1172         as = alloc_async(uurb->number_of_packets);
1173         if (!as) {
1174                 kfree(isopkt);
1175                 kfree(dr);
1176                 return -ENOMEM;
1177         }
1178         if (uurb->buffer_length > 0) {
1179                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1180                                 GFP_KERNEL);
1181                 if (!as->urb->transfer_buffer) {
1182                         kfree(isopkt);
1183                         kfree(dr);
1184                         free_async(as);
1185                         return -ENOMEM;
1186                 }
1187         }
1188         as->urb->dev = ps->dev;
1189         as->urb->pipe = (uurb->type << 30) |
1190                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1191                         (uurb->endpoint & USB_DIR_IN);
1192
1193         /* This tedious sequence is necessary because the URB_* flags
1194          * are internal to the kernel and subject to change, whereas
1195          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1196          */
1197         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1198         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1199                 u |= URB_ISO_ASAP;
1200         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1201                 u |= URB_SHORT_NOT_OK;
1202         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1203                 u |= URB_NO_FSBR;
1204         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1205                 u |= URB_ZERO_PACKET;
1206         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1207                 u |= URB_NO_INTERRUPT;
1208         as->urb->transfer_flags = u;
1209
1210         as->urb->transfer_buffer_length = uurb->buffer_length;
1211         as->urb->setup_packet = (unsigned char *)dr;
1212         as->urb->start_frame = uurb->start_frame;
1213         as->urb->number_of_packets = uurb->number_of_packets;
1214         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1215                         ps->dev->speed == USB_SPEED_HIGH)
1216                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1217         else
1218                 as->urb->interval = ep->desc.bInterval;
1219         as->urb->context = as;
1220         as->urb->complete = async_completed;
1221         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1222                 as->urb->iso_frame_desc[u].offset = totlen;
1223                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1224                 totlen += isopkt[u].length;
1225         }
1226         kfree(isopkt);
1227         as->ps = ps;
1228         as->userurb = arg;
1229         if (is_in && uurb->buffer_length > 0)
1230                 as->userbuffer = uurb->buffer;
1231         else
1232                 as->userbuffer = NULL;
1233         as->signr = uurb->signr;
1234         as->ifnum = ifnum;
1235         as->pid = get_pid(task_pid(current));
1236         as->uid = cred->uid;
1237         as->euid = cred->euid;
1238         security_task_getsecid(current, &as->secid);
1239         if (!is_in && uurb->buffer_length > 0) {
1240                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1241                                 uurb->buffer_length)) {
1242                         free_async(as);
1243                         return -EFAULT;
1244                 }
1245         }
1246         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1247                         as->urb->transfer_buffer_length, 0, SUBMIT);
1248         async_newpending(as);
1249
1250         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1251                 spin_lock_irq(&ps->lock);
1252
1253                 /* Not exactly the endpoint address; the direction bit is
1254                  * shifted to the 0x10 position so that the value will be
1255                  * between 0 and 31.
1256                  */
1257                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1258                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1259                                 >> 3);
1260
1261                 /* If this bulk URB is the start of a new transfer, re-enable
1262                  * the endpoint.  Otherwise mark it as a continuation URB.
1263                  */
1264                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1265                         as->bulk_status = AS_CONTINUATION;
1266                 else
1267                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1268
1269                 /* Don't accept continuation URBs if the endpoint is
1270                  * disabled because of an earlier error.
1271                  */
1272                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1273                         ret = -EREMOTEIO;
1274                 else
1275                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1276                 spin_unlock_irq(&ps->lock);
1277         } else {
1278                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1279         }
1280
1281         if (ret) {
1282                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1283                            "usbfs: usb_submit_urb returned %d\n", ret);
1284                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1285                                 0, ret, COMPLETE);
1286                 async_removepending(as);
1287                 free_async(as);
1288                 return ret;
1289         }
1290         return 0;
1291 }
1292
1293 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1294 {
1295         struct usbdevfs_urb uurb;
1296
1297         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1298                 return -EFAULT;
1299
1300         return proc_do_submiturb(ps, &uurb,
1301                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1302                         arg);
1303 }
1304
1305 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1306 {
1307         struct async *as;
1308
1309         as = async_getpending(ps, arg);
1310         if (!as)
1311                 return -EINVAL;
1312         usb_kill_urb(as->urb);
1313         return 0;
1314 }
1315
1316 static int processcompl(struct async *as, void __user * __user *arg)
1317 {
1318         struct urb *urb = as->urb;
1319         struct usbdevfs_urb __user *userurb = as->userurb;
1320         void __user *addr = as->userurb;
1321         unsigned int i;
1322
1323         if (as->userbuffer && urb->actual_length)
1324                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1325                                  urb->actual_length))
1326                         goto err_out;
1327         if (put_user(as->status, &userurb->status))
1328                 goto err_out;
1329         if (put_user(urb->actual_length, &userurb->actual_length))
1330                 goto err_out;
1331         if (put_user(urb->error_count, &userurb->error_count))
1332                 goto err_out;
1333
1334         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1335                 for (i = 0; i < urb->number_of_packets; i++) {
1336                         if (put_user(urb->iso_frame_desc[i].actual_length,
1337                                      &userurb->iso_frame_desc[i].actual_length))
1338                                 goto err_out;
1339                         if (put_user(urb->iso_frame_desc[i].status,
1340                                      &userurb->iso_frame_desc[i].status))
1341                                 goto err_out;
1342                 }
1343         }
1344
1345         if (put_user(addr, (void __user * __user *)arg))
1346                 return -EFAULT;
1347         return 0;
1348
1349 err_out:
1350         return -EFAULT;
1351 }
1352
1353 static struct async *reap_as(struct dev_state *ps)
1354 {
1355         DECLARE_WAITQUEUE(wait, current);
1356         struct async *as = NULL;
1357         struct usb_device *dev = ps->dev;
1358
1359         add_wait_queue(&ps->wait, &wait);
1360         for (;;) {
1361                 __set_current_state(TASK_INTERRUPTIBLE);
1362                 as = async_getcompleted(ps);
1363                 if (as)
1364                         break;
1365                 if (signal_pending(current))
1366                         break;
1367                 usb_unlock_device(dev);
1368                 schedule();
1369                 usb_lock_device(dev);
1370         }
1371         remove_wait_queue(&ps->wait, &wait);
1372         set_current_state(TASK_RUNNING);
1373         return as;
1374 }
1375
1376 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1377 {
1378         struct async *as = reap_as(ps);
1379         if (as) {
1380                 int retval = processcompl(as, (void __user * __user *)arg);
1381                 free_async(as);
1382                 return retval;
1383         }
1384         if (signal_pending(current))
1385                 return -EINTR;
1386         return -EIO;
1387 }
1388
1389 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1390 {
1391         int retval;
1392         struct async *as;
1393
1394         as = async_getcompleted(ps);
1395         retval = -EAGAIN;
1396         if (as) {
1397                 retval = processcompl(as, (void __user * __user *)arg);
1398                 free_async(as);
1399         }
1400         return retval;
1401 }
1402
1403 #ifdef CONFIG_COMPAT
1404 static int proc_control_compat(struct dev_state *ps,
1405                                 struct usbdevfs_ctrltransfer32 __user *p32)
1406 {
1407         struct usbdevfs_ctrltransfer __user *p;
1408         __u32 udata;
1409         p = compat_alloc_user_space(sizeof(*p));
1410         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1411             get_user(udata, &p32->data) ||
1412             put_user(compat_ptr(udata), &p->data))
1413                 return -EFAULT;
1414         return proc_control(ps, p);
1415 }
1416
1417 static int proc_bulk_compat(struct dev_state *ps,
1418                         struct usbdevfs_bulktransfer32 __user *p32)
1419 {
1420         struct usbdevfs_bulktransfer __user *p;
1421         compat_uint_t n;
1422         compat_caddr_t addr;
1423
1424         p = compat_alloc_user_space(sizeof(*p));
1425
1426         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1427             get_user(n, &p32->len) || put_user(n, &p->len) ||
1428             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1429             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1430                 return -EFAULT;
1431
1432         return proc_bulk(ps, p);
1433 }
1434 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1435 {
1436         struct usbdevfs_disconnectsignal32 ds;
1437
1438         if (copy_from_user(&ds, arg, sizeof(ds)))
1439                 return -EFAULT;
1440         ps->discsignr = ds.signr;
1441         ps->disccontext = compat_ptr(ds.context);
1442         return 0;
1443 }
1444
1445 static int get_urb32(struct usbdevfs_urb *kurb,
1446                      struct usbdevfs_urb32 __user *uurb)
1447 {
1448         __u32  uptr;
1449         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1450             __get_user(kurb->type, &uurb->type) ||
1451             __get_user(kurb->endpoint, &uurb->endpoint) ||
1452             __get_user(kurb->status, &uurb->status) ||
1453             __get_user(kurb->flags, &uurb->flags) ||
1454             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1455             __get_user(kurb->actual_length, &uurb->actual_length) ||
1456             __get_user(kurb->start_frame, &uurb->start_frame) ||
1457             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1458             __get_user(kurb->error_count, &uurb->error_count) ||
1459             __get_user(kurb->signr, &uurb->signr))
1460                 return -EFAULT;
1461
1462         if (__get_user(uptr, &uurb->buffer))
1463                 return -EFAULT;
1464         kurb->buffer = compat_ptr(uptr);
1465         if (__get_user(uptr, &uurb->usercontext))
1466                 return -EFAULT;
1467         kurb->usercontext = compat_ptr(uptr);
1468
1469         return 0;
1470 }
1471
1472 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1473 {
1474         struct usbdevfs_urb uurb;
1475
1476         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1477                 return -EFAULT;
1478
1479         return proc_do_submiturb(ps, &uurb,
1480                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1481                         arg);
1482 }
1483
1484 static int processcompl_compat(struct async *as, void __user * __user *arg)
1485 {
1486         struct urb *urb = as->urb;
1487         struct usbdevfs_urb32 __user *userurb = as->userurb;
1488         void __user *addr = as->userurb;
1489         unsigned int i;
1490
1491         if (as->userbuffer && urb->actual_length)
1492                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1493                                  urb->actual_length))
1494                         return -EFAULT;
1495         if (put_user(as->status, &userurb->status))
1496                 return -EFAULT;
1497         if (put_user(urb->actual_length, &userurb->actual_length))
1498                 return -EFAULT;
1499         if (put_user(urb->error_count, &userurb->error_count))
1500                 return -EFAULT;
1501
1502         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1503                 for (i = 0; i < urb->number_of_packets; i++) {
1504                         if (put_user(urb->iso_frame_desc[i].actual_length,
1505                                      &userurb->iso_frame_desc[i].actual_length))
1506                                 return -EFAULT;
1507                         if (put_user(urb->iso_frame_desc[i].status,
1508                                      &userurb->iso_frame_desc[i].status))
1509                                 return -EFAULT;
1510                 }
1511         }
1512
1513         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1514                 return -EFAULT;
1515         return 0;
1516 }
1517
1518 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1519 {
1520         struct async *as = reap_as(ps);
1521         if (as) {
1522                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1523                 free_async(as);
1524                 return retval;
1525         }
1526         if (signal_pending(current))
1527                 return -EINTR;
1528         return -EIO;
1529 }
1530
1531 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1532 {
1533         int retval;
1534         struct async *as;
1535
1536         retval = -EAGAIN;
1537         as = async_getcompleted(ps);
1538         if (as) {
1539                 retval = processcompl_compat(as, (void __user * __user *)arg);
1540                 free_async(as);
1541         }
1542         return retval;
1543 }
1544
1545
1546 #endif
1547
1548 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1549 {
1550         struct usbdevfs_disconnectsignal ds;
1551
1552         if (copy_from_user(&ds, arg, sizeof(ds)))
1553                 return -EFAULT;
1554         ps->discsignr = ds.signr;
1555         ps->disccontext = ds.context;
1556         return 0;
1557 }
1558
1559 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1560 {
1561         unsigned int ifnum;
1562
1563         if (get_user(ifnum, (unsigned int __user *)arg))
1564                 return -EFAULT;
1565         return claimintf(ps, ifnum);
1566 }
1567
1568 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1569 {
1570         unsigned int ifnum;
1571         int ret;
1572
1573         if (get_user(ifnum, (unsigned int __user *)arg))
1574                 return -EFAULT;
1575         if ((ret = releaseintf(ps, ifnum)) < 0)
1576                 return ret;
1577         destroy_async_on_interface (ps, ifnum);
1578         return 0;
1579 }
1580
1581 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1582 {
1583         int                     size;
1584         void                    *buf = NULL;
1585         int                     retval = 0;
1586         struct usb_interface    *intf = NULL;
1587         struct usb_driver       *driver = NULL;
1588
1589         /* alloc buffer */
1590         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1591                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1592                         return -ENOMEM;
1593                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1594                         if (copy_from_user(buf, ctl->data, size)) {
1595                                 kfree(buf);
1596                                 return -EFAULT;
1597                         }
1598                 } else {
1599                         memset(buf, 0, size);
1600                 }
1601         }
1602
1603         if (!connected(ps)) {
1604                 kfree(buf);
1605                 return -ENODEV;
1606         }
1607
1608         if (ps->dev->state != USB_STATE_CONFIGURED)
1609                 retval = -EHOSTUNREACH;
1610         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1611                 retval = -EINVAL;
1612         else switch (ctl->ioctl_code) {
1613
1614         /* disconnect kernel driver from interface */
1615         case USBDEVFS_DISCONNECT:
1616                 if (intf->dev.driver) {
1617                         driver = to_usb_driver(intf->dev.driver);
1618                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1619                         usb_driver_release_interface(driver, intf);
1620                 } else
1621                         retval = -ENODATA;
1622                 break;
1623
1624         /* let kernel drivers try to (re)bind to the interface */
1625         case USBDEVFS_CONNECT:
1626                 if (!intf->dev.driver)
1627                         retval = device_attach(&intf->dev);
1628                 else
1629                         retval = -EBUSY;
1630                 break;
1631
1632         /* talk directly to the interface's driver */
1633         default:
1634                 if (intf->dev.driver)
1635                         driver = to_usb_driver(intf->dev.driver);
1636                 if (driver == NULL || driver->ioctl == NULL) {
1637                         retval = -ENOTTY;
1638                 } else {
1639                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1640                         if (retval == -ENOIOCTLCMD)
1641                                 retval = -ENOTTY;
1642                 }
1643         }
1644
1645         /* cleanup and return */
1646         if (retval >= 0
1647                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1648                         && size > 0
1649                         && copy_to_user(ctl->data, buf, size) != 0)
1650                 retval = -EFAULT;
1651
1652         kfree(buf);
1653         return retval;
1654 }
1655
1656 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1657 {
1658         struct usbdevfs_ioctl   ctrl;
1659
1660         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1661                 return -EFAULT;
1662         return proc_ioctl(ps, &ctrl);
1663 }
1664
1665 #ifdef CONFIG_COMPAT
1666 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1667 {
1668         struct usbdevfs_ioctl32 __user *uioc;
1669         struct usbdevfs_ioctl ctrl;
1670         u32 udata;
1671
1672         uioc = compat_ptr((long)arg);
1673         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1674             __get_user(ctrl.ifno, &uioc->ifno) ||
1675             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1676             __get_user(udata, &uioc->data))
1677                 return -EFAULT;
1678         ctrl.data = compat_ptr(udata);
1679
1680         return proc_ioctl(ps, &ctrl);
1681 }
1682 #endif
1683
1684 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1685 {
1686         unsigned portnum;
1687         int rc;
1688
1689         if (get_user(portnum, (unsigned __user *) arg))
1690                 return -EFAULT;
1691         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1692         if (rc == 0)
1693                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1694                         portnum, task_pid_nr(current), current->comm);
1695         return rc;
1696 }
1697
1698 static int proc_release_port(struct dev_state *ps, void __user *arg)
1699 {
1700         unsigned portnum;
1701
1702         if (get_user(portnum, (unsigned __user *) arg))
1703                 return -EFAULT;
1704         return usb_hub_release_port(ps->dev, portnum, ps);
1705 }
1706
1707 /*
1708  * NOTE:  All requests here that have interface numbers as parameters
1709  * are assuming that somehow the configuration has been prevented from
1710  * changing.  But there's no mechanism to ensure that...
1711  */
1712 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1713                                 void __user *p)
1714 {
1715         struct dev_state *ps = file->private_data;
1716         struct inode *inode = file->f_path.dentry->d_inode;
1717         struct usb_device *dev = ps->dev;
1718         int ret = -ENOTTY;
1719
1720         if (!(file->f_mode & FMODE_WRITE))
1721                 return -EPERM;
1722         usb_lock_device(dev);
1723         if (!connected(ps)) {
1724                 usb_unlock_device(dev);
1725                 return -ENODEV;
1726         }
1727
1728         switch (cmd) {
1729         case USBDEVFS_CONTROL:
1730                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1731                 ret = proc_control(ps, p);
1732                 if (ret >= 0)
1733                         inode->i_mtime = CURRENT_TIME;
1734                 break;
1735
1736         case USBDEVFS_BULK:
1737                 snoop(&dev->dev, "%s: BULK\n", __func__);
1738                 ret = proc_bulk(ps, p);
1739                 if (ret >= 0)
1740                         inode->i_mtime = CURRENT_TIME;
1741                 break;
1742
1743         case USBDEVFS_RESETEP:
1744                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1745                 ret = proc_resetep(ps, p);
1746                 if (ret >= 0)
1747                         inode->i_mtime = CURRENT_TIME;
1748                 break;
1749
1750         case USBDEVFS_RESET:
1751                 snoop(&dev->dev, "%s: RESET\n", __func__);
1752                 ret = proc_resetdevice(ps);
1753                 break;
1754
1755         case USBDEVFS_CLEAR_HALT:
1756                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1757                 ret = proc_clearhalt(ps, p);
1758                 if (ret >= 0)
1759                         inode->i_mtime = CURRENT_TIME;
1760                 break;
1761
1762         case USBDEVFS_GETDRIVER:
1763                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1764                 ret = proc_getdriver(ps, p);
1765                 break;
1766
1767         case USBDEVFS_CONNECTINFO:
1768                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1769                 ret = proc_connectinfo(ps, p);
1770                 break;
1771
1772         case USBDEVFS_SETINTERFACE:
1773                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1774                 ret = proc_setintf(ps, p);
1775                 break;
1776
1777         case USBDEVFS_SETCONFIGURATION:
1778                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1779                 ret = proc_setconfig(ps, p);
1780                 break;
1781
1782         case USBDEVFS_SUBMITURB:
1783                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1784                 ret = proc_submiturb(ps, p);
1785                 if (ret >= 0)
1786                         inode->i_mtime = CURRENT_TIME;
1787                 break;
1788
1789 #ifdef CONFIG_COMPAT
1790         case USBDEVFS_CONTROL32:
1791                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1792                 ret = proc_control_compat(ps, p);
1793                 if (ret >= 0)
1794                         inode->i_mtime = CURRENT_TIME;
1795                 break;
1796
1797         case USBDEVFS_BULK32:
1798                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1799                 ret = proc_bulk_compat(ps, p);
1800                 if (ret >= 0)
1801                         inode->i_mtime = CURRENT_TIME;
1802                 break;
1803
1804         case USBDEVFS_DISCSIGNAL32:
1805                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1806                 ret = proc_disconnectsignal_compat(ps, p);
1807                 break;
1808
1809         case USBDEVFS_SUBMITURB32:
1810                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1811                 ret = proc_submiturb_compat(ps, p);
1812                 if (ret >= 0)
1813                         inode->i_mtime = CURRENT_TIME;
1814                 break;
1815
1816         case USBDEVFS_REAPURB32:
1817                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1818                 ret = proc_reapurb_compat(ps, p);
1819                 break;
1820
1821         case USBDEVFS_REAPURBNDELAY32:
1822                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1823                 ret = proc_reapurbnonblock_compat(ps, p);
1824                 break;
1825
1826         case USBDEVFS_IOCTL32:
1827                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1828                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1829                 break;
1830 #endif
1831
1832         case USBDEVFS_DISCARDURB:
1833                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1834                 ret = proc_unlinkurb(ps, p);
1835                 break;
1836
1837         case USBDEVFS_REAPURB:
1838                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1839                 ret = proc_reapurb(ps, p);
1840                 break;
1841
1842         case USBDEVFS_REAPURBNDELAY:
1843                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1844                 ret = proc_reapurbnonblock(ps, p);
1845                 break;
1846
1847         case USBDEVFS_DISCSIGNAL:
1848                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1849                 ret = proc_disconnectsignal(ps, p);
1850                 break;
1851
1852         case USBDEVFS_CLAIMINTERFACE:
1853                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1854                 ret = proc_claiminterface(ps, p);
1855                 break;
1856
1857         case USBDEVFS_RELEASEINTERFACE:
1858                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1859                 ret = proc_releaseinterface(ps, p);
1860                 break;
1861
1862         case USBDEVFS_IOCTL:
1863                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1864                 ret = proc_ioctl_default(ps, p);
1865                 break;
1866
1867         case USBDEVFS_CLAIM_PORT:
1868                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1869                 ret = proc_claim_port(ps, p);
1870                 break;
1871
1872         case USBDEVFS_RELEASE_PORT:
1873                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1874                 ret = proc_release_port(ps, p);
1875                 break;
1876         }
1877         usb_unlock_device(dev);
1878         if (ret >= 0)
1879                 inode->i_atime = CURRENT_TIME;
1880         return ret;
1881 }
1882
1883 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1884                         unsigned long arg)
1885 {
1886         int ret;
1887
1888         lock_kernel();
1889         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1890         unlock_kernel();
1891
1892         return ret;
1893 }
1894
1895 #ifdef CONFIG_COMPAT
1896 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1897                         unsigned long arg)
1898 {
1899         int ret;
1900
1901         lock_kernel();
1902         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1903         unlock_kernel();
1904
1905         return ret;
1906 }
1907 #endif
1908
1909 /* No kernel lock - fine */
1910 static unsigned int usbdev_poll(struct file *file,
1911                                 struct poll_table_struct *wait)
1912 {
1913         struct dev_state *ps = file->private_data;
1914         unsigned int mask = 0;
1915
1916         poll_wait(file, &ps->wait, wait);
1917         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1918                 mask |= POLLOUT | POLLWRNORM;
1919         if (!connected(ps))
1920                 mask |= POLLERR | POLLHUP;
1921         return mask;
1922 }
1923
1924 const struct file_operations usbdev_file_operations = {
1925         .owner =          THIS_MODULE,
1926         .llseek =         usbdev_lseek,
1927         .read =           usbdev_read,
1928         .poll =           usbdev_poll,
1929         .unlocked_ioctl = usbdev_ioctl,
1930 #ifdef CONFIG_COMPAT
1931         .compat_ioctl =   usbdev_compat_ioctl,
1932 #endif
1933         .open =           usbdev_open,
1934         .release =        usbdev_release,
1935 };
1936
1937 static void usbdev_remove(struct usb_device *udev)
1938 {
1939         struct dev_state *ps;
1940         struct siginfo sinfo;
1941
1942         while (!list_empty(&udev->filelist)) {
1943                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1944                 destroy_all_async(ps);
1945                 wake_up_all(&ps->wait);
1946                 list_del_init(&ps->list);
1947                 if (ps->discsignr) {
1948                         sinfo.si_signo = ps->discsignr;
1949                         sinfo.si_errno = EPIPE;
1950                         sinfo.si_code = SI_ASYNCIO;
1951                         sinfo.si_addr = ps->disccontext;
1952                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1953                                         ps->disc_pid, ps->disc_uid,
1954                                         ps->disc_euid, ps->secid);
1955                 }
1956         }
1957 }
1958
1959 #ifdef CONFIG_USB_DEVICE_CLASS
1960 static struct class *usb_classdev_class;
1961
1962 static int usb_classdev_add(struct usb_device *dev)
1963 {
1964         struct device *cldev;
1965
1966         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1967                               NULL, "usbdev%d.%d", dev->bus->busnum,
1968                               dev->devnum);
1969         if (IS_ERR(cldev))
1970                 return PTR_ERR(cldev);
1971         dev->usb_classdev = cldev;
1972         return 0;
1973 }
1974
1975 static void usb_classdev_remove(struct usb_device *dev)
1976 {
1977         if (dev->usb_classdev)
1978                 device_unregister(dev->usb_classdev);
1979 }
1980
1981 #else
1982 #define usb_classdev_add(dev)           0
1983 #define usb_classdev_remove(dev)        do {} while (0)
1984
1985 #endif
1986
1987 static int usbdev_notify(struct notifier_block *self,
1988                                unsigned long action, void *dev)
1989 {
1990         switch (action) {
1991         case USB_DEVICE_ADD:
1992                 if (usb_classdev_add(dev))
1993                         return NOTIFY_BAD;
1994                 break;
1995         case USB_DEVICE_REMOVE:
1996                 usb_classdev_remove(dev);
1997                 usbdev_remove(dev);
1998                 break;
1999         }
2000         return NOTIFY_OK;
2001 }
2002
2003 static struct notifier_block usbdev_nb = {
2004         .notifier_call =        usbdev_notify,
2005 };
2006
2007 static struct cdev usb_device_cdev;
2008
2009 int __init usb_devio_init(void)
2010 {
2011         int retval;
2012
2013         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2014                                         "usb_device");
2015         if (retval) {
2016                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2017                 goto out;
2018         }
2019         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2020         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2021         if (retval) {
2022                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2023                        USB_DEVICE_MAJOR);
2024                 goto error_cdev;
2025         }
2026 #ifdef CONFIG_USB_DEVICE_CLASS
2027         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2028         if (IS_ERR(usb_classdev_class)) {
2029                 printk(KERN_ERR "Unable to register usb_device class\n");
2030                 retval = PTR_ERR(usb_classdev_class);
2031                 cdev_del(&usb_device_cdev);
2032                 usb_classdev_class = NULL;
2033                 goto out;
2034         }
2035         /* devices of this class shadow the major:minor of their parent
2036          * device, so clear ->dev_kobj to prevent adding duplicate entries
2037          * to /sys/dev
2038          */
2039         usb_classdev_class->dev_kobj = NULL;
2040 #endif
2041         usb_register_notify(&usbdev_nb);
2042 out:
2043         return retval;
2044
2045 error_cdev:
2046         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2047         goto out;
2048 }
2049
2050 void usb_devio_cleanup(void)
2051 {
2052         usb_unregister_notify(&usbdev_nb);
2053 #ifdef CONFIG_USB_DEVICE_CLASS
2054         class_destroy(usb_classdev_class);
2055 #endif
2056         cdev_del(&usb_device_cdev);
2057         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2058 }