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 */
  64DEFINE_MUTEX(usbfs_mutex);
  65
  66struct 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
  86struct 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
  97struct 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
 115static bool usbfs_snoop;
 116module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 117MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 118
 119static unsigned usbfs_snoop_max = 65536;
 120module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 121MODULE_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
 130enum 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 */
 137static unsigned usbfs_memory_mb = 16;
 138module_param(usbfs_memory_mb, uint, 0644);
 139MODULE_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
 145static atomic_t usbfs_memory_usage;	/* Total memory currently allocated */
 146
 147/* Check whether it's okay to allocate more memory for a transfer */
 148static 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 */
 170static void usbfs_decrease_memory_usage(unsigned amount)
 171{
 172	atomic_sub(amount, &usbfs_memory_usage);
 173}
 174
 175static int connected(struct usb_dev_state *ps)
 176{
 177	return (!list_empty(&ps->list) &&
 178			ps->dev->state != USB_STATE_NOTATTACHED);
 179}
 180
 181static 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
 202static 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
 212static 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
 219static struct vm_operations_struct usbdev_vm_ops = {
 220	.open = usbdev_vm_open,
 221	.close = usbdev_vm_close
 222};
 223
 224static 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
 279error_free_usbm:
 280	kfree(usbm);
 281error_decrease_mem:
 282	usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 283error:
 284	return ret;
 285}
 286
 287static 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
 368err:
 369	usb_unlock_device(dev);
 370	return ret;
 371}
 372
 373/*
 374 * async list handling
 375 */
 376
 377static 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
 392static 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
 416static 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
 426static 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
 436static 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
 451static 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
 465static 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
 510static 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
 532static 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
 561static 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
 599static 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
 643static 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
 665static 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
 680static 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
 691static int driver_probe(struct usb_interface *intf,
 692			const struct usb_device_id *id)
 693{
 694	return -ENODEV;
 695}
 696
 697static 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 */
 724static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 725{
 726	return 0;
 727}
 728
 729static int driver_resume(struct usb_interface *intf)
 730{
 731	return 0;
 732}
 733
 734struct 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
 742static 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
 768static 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
 788static 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
 803static 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
 828static 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
 887static 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
 896static 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
 964error:
 965	kfree(eps);
 966	return ret;
 967}
 968
 969static int match_devt(struct device *dev, void *data)
 970{
 971	return dev->devt == (dev_t) (unsigned long) data;
 972}
 973
 974static 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 */
 988static 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
1049static 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
1083static 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
1170static 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
1244static 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
1258static 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
1276static 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
1299static 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
1318static 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
1331static 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
1358static 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
1375static 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
1423static struct usb_memory *
1424find_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
1448static 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
1713	if (ep->desc.bInterval) {
1714		if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1715				ps->dev->speed == USB_SPEED_HIGH ||
1716				ps->dev->speed >= USB_SPEED_SUPER)
1717			as->urb->interval = 1 <<
1718					min(15, ep->desc.bInterval - 1);
1719		else
1720			as->urb->interval = ep->desc.bInterval;
1721	}
1722
1723	as->urb->context = as;
1724	as->urb->complete = async_completed;
1725	for (totlen = u = 0; u < number_of_packets; u++) {
1726		as->urb->iso_frame_desc[u].offset = totlen;
1727		as->urb->iso_frame_desc[u].length = isopkt[u].length;
1728		totlen += isopkt[u].length;
1729	}
1730	kfree(isopkt);
1731	isopkt = NULL;
1732	as->ps = ps;
1733	as->userurb = arg;
1734	if (as->usbm) {
1735		unsigned long uurb_start = (unsigned long)uurb->buffer;
1736
1737		as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1738		as->urb->transfer_dma = as->usbm->dma_handle +
1739				(uurb_start - as->usbm->vm_start);
1740	} else if (is_in && uurb->buffer_length > 0)
1741		as->userbuffer = uurb->buffer;
1742	as->signr = uurb->signr;
1743	as->ifnum = ifnum;
1744	as->pid = get_pid(task_pid(current));
1745	as->cred = get_current_cred();
1746	security_task_getsecid(current, &as->secid);
1747	snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1748			as->urb->transfer_buffer_length, 0, SUBMIT,
1749			NULL, 0);
1750	if (!is_in)
1751		snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1752
1753	async_newpending(as);
1754
1755	if (usb_endpoint_xfer_bulk(&ep->desc)) {
1756		spin_lock_irq(&ps->lock);
1757
1758		/* Not exactly the endpoint address; the direction bit is
1759		 * shifted to the 0x10 position so that the value will be
1760		 * between 0 and 31.
1761		 */
1762		as->bulk_addr = usb_endpoint_num(&ep->desc) |
1763			((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1764				>> 3);
1765
1766		/* If this bulk URB is the start of a new transfer, re-enable
1767		 * the endpoint.  Otherwise mark it as a continuation URB.
1768		 */
1769		if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1770			as->bulk_status = AS_CONTINUATION;
1771		else
1772			ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1773
1774		/* Don't accept continuation URBs if the endpoint is
1775		 * disabled because of an earlier error.
1776		 */
1777		if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1778			ret = -EREMOTEIO;
1779		else
1780			ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1781		spin_unlock_irq(&ps->lock);
1782	} else {
1783		ret = usb_submit_urb(as->urb, GFP_KERNEL);
1784	}
1785
1786	if (ret) {
1787		dev_printk(KERN_DEBUG, &ps->dev->dev,
1788			   "usbfs: usb_submit_urb returned %d\n", ret);
1789		snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1790				0, ret, COMPLETE, NULL, 0);
1791		async_removepending(as);
1792		goto error;
1793	}
1794	return 0;
1795
1796 error:
1797	if (as && as->usbm)
1798		dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1799	kfree(isopkt);
1800	kfree(dr);
1801	if (as)
1802		free_async(as);
1803	return ret;
1804}
1805
1806static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1807{
1808	struct usbdevfs_urb uurb;
1809
1810	if (copy_from_user(&uurb, arg, sizeof(uurb)))
1811		return -EFAULT;
1812
1813	return proc_do_submiturb(ps, &uurb,
1814			(((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1815			arg);
1816}
1817
1818static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1819{
1820	struct urb *urb;
1821	struct async *as;
1822	unsigned long flags;
1823
1824	spin_lock_irqsave(&ps->lock, flags);
1825	as = async_getpending(ps, arg);
1826	if (!as) {
1827		spin_unlock_irqrestore(&ps->lock, flags);
1828		return -EINVAL;
1829	}
1830
1831	urb = as->urb;
1832	usb_get_urb(urb);
1833	spin_unlock_irqrestore(&ps->lock, flags);
1834
1835	usb_kill_urb(urb);
1836	usb_put_urb(urb);
1837
1838	return 0;
1839}
1840
1841static int processcompl(struct async *as, void __user * __user *arg)
1842{
1843	struct urb *urb = as->urb;
1844	struct usbdevfs_urb __user *userurb = as->userurb;
1845	void __user *addr = as->userurb;
1846	unsigned int i;
1847
1848	if (as->userbuffer && urb->actual_length) {
1849		if (copy_urb_data_to_user(as->userbuffer, urb))
1850			goto err_out;
1851	}
1852	if (put_user(as->status, &userurb->status))
1853		goto err_out;
1854	if (put_user(urb->actual_length, &userurb->actual_length))
1855		goto err_out;
1856	if (put_user(urb->error_count, &userurb->error_count))
1857		goto err_out;
1858
1859	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1860		for (i = 0; i < urb->number_of_packets; i++) {
1861			if (put_user(urb->iso_frame_desc[i].actual_length,
1862				     &userurb->iso_frame_desc[i].actual_length))
1863				goto err_out;
1864			if (put_user(urb->iso_frame_desc[i].status,
1865				     &userurb->iso_frame_desc[i].status))
1866				goto err_out;
1867		}
1868	}
1869
1870	if (put_user(addr, (void __user * __user *)arg))
1871		return -EFAULT;
1872	return 0;
1873
1874err_out:
1875	return -EFAULT;
1876}
1877
1878static struct async *reap_as(struct usb_dev_state *ps)
1879{
1880	DECLARE_WAITQUEUE(wait, current);
1881	struct async *as = NULL;
1882	struct usb_device *dev = ps->dev;
1883
1884	add_wait_queue(&ps->wait, &wait);
1885	for (;;) {
1886		__set_current_state(TASK_INTERRUPTIBLE);
1887		as = async_getcompleted(ps);
1888		if (as || !connected(ps))
1889			break;
1890		if (signal_pending(current))
1891			break;
1892		usb_unlock_device(dev);
1893		schedule();
1894		usb_lock_device(dev);
1895	}
1896	remove_wait_queue(&ps->wait, &wait);
1897	set_current_state(TASK_RUNNING);
1898	return as;
1899}
1900
1901static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1902{
1903	struct async *as = reap_as(ps);
1904
1905	if (as) {
1906		int retval;
1907
1908		snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1909		retval = processcompl(as, (void __user * __user *)arg);
1910		free_async(as);
1911		return retval;
1912	}
1913	if (signal_pending(current))
1914		return -EINTR;
1915	return -ENODEV;
1916}
1917
1918static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1919{
1920	int retval;
1921	struct async *as;
1922
1923	as = async_getcompleted(ps);
1924	if (as) {
1925		snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1926		retval = processcompl(as, (void __user * __user *)arg);
1927		free_async(as);
1928	} else {
1929		retval = (connected(ps) ? -EAGAIN : -ENODEV);
1930	}
1931	return retval;
1932}
1933
1934#ifdef CONFIG_COMPAT
1935static int proc_control_compat(struct usb_dev_state *ps,
1936				struct usbdevfs_ctrltransfer32 __user *p32)
1937{
1938	struct usbdevfs_ctrltransfer __user *p;
1939	__u32 udata;
1940	p = compat_alloc_user_space(sizeof(*p));
1941	if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1942	    get_user(udata, &p32->data) ||
1943	    put_user(compat_ptr(udata), &p->data))
1944		return -EFAULT;
1945	return proc_control(ps, p);
1946}
1947
1948static int proc_bulk_compat(struct usb_dev_state *ps,
1949			struct usbdevfs_bulktransfer32 __user *p32)
1950{
1951	struct usbdevfs_bulktransfer __user *p;
1952	compat_uint_t n;
1953	compat_caddr_t addr;
1954
1955	p = compat_alloc_user_space(sizeof(*p));
1956
1957	if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1958	    get_user(n, &p32->len) || put_user(n, &p->len) ||
1959	    get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1960	    get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1961		return -EFAULT;
1962
1963	return proc_bulk(ps, p);
1964}
1965static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1966{
1967	struct usbdevfs_disconnectsignal32 ds;
1968
1969	if (copy_from_user(&ds, arg, sizeof(ds)))
1970		return -EFAULT;
1971	ps->discsignr = ds.signr;
1972	ps->disccontext = compat_ptr(ds.context);
1973	return 0;
1974}
1975
1976static int get_urb32(struct usbdevfs_urb *kurb,
1977		     struct usbdevfs_urb32 __user *uurb)
1978{
1979	__u32  uptr;
1980	if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1981	    __get_user(kurb->type, &uurb->type) ||
1982	    __get_user(kurb->endpoint, &uurb->endpoint) ||
1983	    __get_user(kurb->status, &uurb->status) ||
1984	    __get_user(kurb->flags, &uurb->flags) ||
1985	    __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1986	    __get_user(kurb->actual_length, &uurb->actual_length) ||
1987	    __get_user(kurb->start_frame, &uurb->start_frame) ||
1988	    __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1989	    __get_user(kurb->error_count, &uurb->error_count) ||
1990	    __get_user(kurb->signr, &uurb->signr))
1991		return -EFAULT;
1992
1993	if (__get_user(uptr, &uurb->buffer))
1994		return -EFAULT;
1995	kurb->buffer = compat_ptr(uptr);
1996	if (__get_user(uptr, &uurb->usercontext))
1997		return -EFAULT;
1998	kurb->usercontext = compat_ptr(uptr);
1999
2000	return 0;
2001}
2002
2003static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2004{
2005	struct usbdevfs_urb uurb;
2006
2007	if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2008		return -EFAULT;
2009
2010	return proc_do_submiturb(ps, &uurb,
2011			((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2012			arg);
2013}
2014
2015static int processcompl_compat(struct async *as, void __user * __user *arg)
2016{
2017	struct urb *urb = as->urb;
2018	struct usbdevfs_urb32 __user *userurb = as->userurb;
2019	void __user *addr = as->userurb;
2020	unsigned int i;
2021
2022	if (as->userbuffer && urb->actual_length) {
2023		if (copy_urb_data_to_user(as->userbuffer, urb))
2024			return -EFAULT;
2025	}
2026	if (put_user(as->status, &userurb->status))
2027		return -EFAULT;
2028	if (put_user(urb->actual_length, &userurb->actual_length))
2029		return -EFAULT;
2030	if (put_user(urb->error_count, &userurb->error_count))
2031		return -EFAULT;
2032
2033	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2034		for (i = 0; i < urb->number_of_packets; i++) {
2035			if (put_user(urb->iso_frame_desc[i].actual_length,
2036				     &userurb->iso_frame_desc[i].actual_length))
2037				return -EFAULT;
2038			if (put_user(urb->iso_frame_desc[i].status,
2039				     &userurb->iso_frame_desc[i].status))
2040				return -EFAULT;
2041		}
2042	}
2043
2044	if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2045		return -EFAULT;
2046	return 0;
2047}
2048
2049static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2050{
2051	struct async *as = reap_as(ps);
2052
2053	if (as) {
2054		int retval;
2055
2056		snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2057		retval = processcompl_compat(as, (void __user * __user *)arg);
2058		free_async(as);
2059		return retval;
2060	}
2061	if (signal_pending(current))
2062		return -EINTR;
2063	return -ENODEV;
2064}
2065
2066static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2067{
2068	int retval;
2069	struct async *as;
2070
2071	as = async_getcompleted(ps);
2072	if (as) {
2073		snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2074		retval = processcompl_compat(as, (void __user * __user *)arg);
2075		free_async(as);
2076	} else {
2077		retval = (connected(ps) ? -EAGAIN : -ENODEV);
2078	}
2079	return retval;
2080}
2081
2082
2083#endif
2084
2085static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2086{
2087	struct usbdevfs_disconnectsignal ds;
2088
2089	if (copy_from_user(&ds, arg, sizeof(ds)))
2090		return -EFAULT;
2091	ps->discsignr = ds.signr;
2092	ps->disccontext = ds.context;
2093	return 0;
2094}
2095
2096static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2097{
2098	unsigned int ifnum;
2099
2100	if (get_user(ifnum, (unsigned int __user *)arg))
2101		return -EFAULT;
2102	return claimintf(ps, ifnum);
2103}
2104
2105static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2106{
2107	unsigned int ifnum;
2108	int ret;
2109
2110	if (get_user(ifnum, (unsigned int __user *)arg))
2111		return -EFAULT;
2112	ret = releaseintf(ps, ifnum);
2113	if (ret < 0)
2114		return ret;
2115	destroy_async_on_interface(ps, ifnum);
2116	return 0;
2117}
2118
2119static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2120{
2121	int			size;
2122	void			*buf = NULL;
2123	int			retval = 0;
2124	struct usb_interface    *intf = NULL;
2125	struct usb_driver       *driver = NULL;
2126
2127	if (ps->privileges_dropped)
2128		return -EACCES;
2129
2130	/* alloc buffer */
2131	size = _IOC_SIZE(ctl->ioctl_code);
2132	if (size > 0) {
2133		buf = kmalloc(size, GFP_KERNEL);
2134		if (buf == NULL)
2135			return -ENOMEM;
2136		if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2137			if (copy_from_user(buf, ctl->data, size)) {
2138				kfree(buf);
2139				return -EFAULT;
2140			}
2141		} else {
2142			memset(buf, 0, size);
2143		}
2144	}
2145
2146	if (!connected(ps)) {
2147		kfree(buf);
2148		return -ENODEV;
2149	}
2150
2151	if (ps->dev->state != USB_STATE_CONFIGURED)
2152		retval = -EHOSTUNREACH;
2153	else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2154		retval = -EINVAL;
2155	else switch (ctl->ioctl_code) {
2156
2157	/* disconnect kernel driver from interface */
2158	case USBDEVFS_DISCONNECT:
2159		if (intf->dev.driver) {
2160			driver = to_usb_driver(intf->dev.driver);
2161			dev_dbg(&intf->dev, "disconnect by usbfs\n");
2162			usb_driver_release_interface(driver, intf);
2163		} else
2164			retval = -ENODATA;
2165		break;
2166
2167	/* let kernel drivers try to (re)bind to the interface */
2168	case USBDEVFS_CONNECT:
2169		if (!intf->dev.driver)
2170			retval = device_attach(&intf->dev);
2171		else
2172			retval = -EBUSY;
2173		break;
2174
2175	/* talk directly to the interface's driver */
2176	default:
2177		if (intf->dev.driver)
2178			driver = to_usb_driver(intf->dev.driver);
2179		if (driver == NULL || driver->unlocked_ioctl == NULL) {
2180			retval = -ENOTTY;
2181		} else {
2182			retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2183			if (retval == -ENOIOCTLCMD)
2184				retval = -ENOTTY;
2185		}
2186	}
2187
2188	/* cleanup and return */
2189	if (retval >= 0
2190			&& (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2191			&& size > 0
2192			&& copy_to_user(ctl->data, buf, size) != 0)
2193		retval = -EFAULT;
2194
2195	kfree(buf);
2196	return retval;
2197}
2198
2199static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2200{
2201	struct usbdevfs_ioctl	ctrl;
2202
2203	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2204		return -EFAULT;
2205	return proc_ioctl(ps, &ctrl);
2206}
2207
2208#ifdef CONFIG_COMPAT
2209static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2210{
2211	struct usbdevfs_ioctl32 __user *uioc;
2212	struct usbdevfs_ioctl ctrl;
2213	u32 udata;
2214
2215	uioc = compat_ptr((long)arg);
2216	if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2217	    __get_user(ctrl.ifno, &uioc->ifno) ||
2218	    __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2219	    __get_user(udata, &uioc->data))
2220		return -EFAULT;
2221	ctrl.data = compat_ptr(udata);
2222
2223	return proc_ioctl(ps, &ctrl);
2224}
2225#endif
2226
2227static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2228{
2229	unsigned portnum;
2230	int rc;
2231
2232	if (get_user(portnum, (unsigned __user *) arg))
2233		return -EFAULT;
2234	rc = usb_hub_claim_port(ps->dev, portnum, ps);
2235	if (rc == 0)
2236		snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2237			portnum, task_pid_nr(current), current->comm);
2238	return rc;
2239}
2240
2241static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2242{
2243	unsigned portnum;
2244
2245	if (get_user(portnum, (unsigned __user *) arg))
2246		return -EFAULT;
2247	return usb_hub_release_port(ps->dev, portnum, ps);
2248}
2249
2250static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2251{
2252	__u32 caps;
2253
2254	caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2255			USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2256			USBDEVFS_CAP_DROP_PRIVILEGES;
2257	if (!ps->dev->bus->no_stop_on_short)
2258		caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2259	if (ps->dev->bus->sg_tablesize)
2260		caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2261
2262	if (put_user(caps, (__u32 __user *)arg))
2263		return -EFAULT;
2264
2265	return 0;
2266}
2267
2268static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2269{
2270	struct usbdevfs_disconnect_claim dc;
2271	struct usb_interface *intf;
2272
2273	if (copy_from_user(&dc, arg, sizeof(dc)))
2274		return -EFAULT;
2275
2276	intf = usb_ifnum_to_if(ps->dev, dc.interface);
2277	if (!intf)
2278		return -EINVAL;
2279
2280	if (intf->dev.driver) {
2281		struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2282
2283		if (ps->privileges_dropped)
2284			return -EACCES;
2285
2286		if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2287				strncmp(dc.driver, intf->dev.driver->name,
2288					sizeof(dc.driver)) != 0)
2289			return -EBUSY;
2290
2291		if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2292				strncmp(dc.driver, intf->dev.driver->name,
2293					sizeof(dc.driver)) == 0)
2294			return -EBUSY;
2295
2296		dev_dbg(&intf->dev, "disconnect by usbfs\n");
2297		usb_driver_release_interface(driver, intf);
2298	}
2299
2300	return claimintf(ps, dc.interface);
2301}
2302
2303static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2304{
2305	unsigned num_streams, num_eps;
2306	struct usb_host_endpoint **eps;
2307	struct usb_interface *intf;
2308	int r;
2309
2310	r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2311				   &eps, &intf);
2312	if (r)
2313		return r;
2314
2315	destroy_async_on_interface(ps,
2316				   intf->altsetting[0].desc.bInterfaceNumber);
2317
2318	r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2319	kfree(eps);
2320	return r;
2321}
2322
2323static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2324{
2325	unsigned num_eps;
2326	struct usb_host_endpoint **eps;
2327	struct usb_interface *intf;
2328	int r;
2329
2330	r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2331	if (r)
2332		return r;
2333
2334	destroy_async_on_interface(ps,
2335				   intf->altsetting[0].desc.bInterfaceNumber);
2336
2337	r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2338	kfree(eps);
2339	return r;
2340}
2341
2342static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2343{
2344	u32 data;
2345
2346	if (copy_from_user(&data, arg, sizeof(data)))
2347		return -EFAULT;
2348
2349	/* This is an one way operation. Once privileges are
2350	 * dropped, you cannot regain them. You may however reissue
2351	 * this ioctl to shrink the allowed interfaces mask.
2352	 */
2353	ps->interface_allowed_mask &= data;
2354	ps->privileges_dropped = true;
2355
2356	return 0;
2357}
2358
2359/*
2360 * NOTE:  All requests here that have interface numbers as parameters
2361 * are assuming that somehow the configuration has been prevented from
2362 * changing.  But there's no mechanism to ensure that...
2363 */
2364static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2365				void __user *p)
2366{
2367	struct usb_dev_state *ps = file->private_data;
2368	struct inode *inode = file_inode(file);
2369	struct usb_device *dev = ps->dev;
2370	int ret = -ENOTTY;
2371
2372	if (!(file->f_mode & FMODE_WRITE))
2373		return -EPERM;
2374
2375	usb_lock_device(dev);
2376
2377	/* Reap operations are allowed even after disconnection */
2378	switch (cmd) {
2379	case USBDEVFS_REAPURB:
2380		snoop(&dev->dev, "%s: REAPURB\n", __func__);
2381		ret = proc_reapurb(ps, p);
2382		goto done;
2383
2384	case USBDEVFS_REAPURBNDELAY:
2385		snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2386		ret = proc_reapurbnonblock(ps, p);
2387		goto done;
2388
2389#ifdef CONFIG_COMPAT
2390	case USBDEVFS_REAPURB32:
2391		snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2392		ret = proc_reapurb_compat(ps, p);
2393		goto done;
2394
2395	case USBDEVFS_REAPURBNDELAY32:
2396		snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2397		ret = proc_reapurbnonblock_compat(ps, p);
2398		goto done;
2399#endif
2400	}
2401
2402	if (!connected(ps)) {
2403		usb_unlock_device(dev);
2404		return -ENODEV;
2405	}
2406
2407	switch (cmd) {
2408	case USBDEVFS_CONTROL:
2409		snoop(&dev->dev, "%s: CONTROL\n", __func__);
2410		ret = proc_control(ps, p);
2411		if (ret >= 0)
2412			inode->i_mtime = current_time(inode);
2413		break;
2414
2415	case USBDEVFS_BULK:
2416		snoop(&dev->dev, "%s: BULK\n", __func__);
2417		ret = proc_bulk(ps, p);
2418		if (ret >= 0)
2419			inode->i_mtime = current_time(inode);
2420		break;
2421
2422	case USBDEVFS_RESETEP:
2423		snoop(&dev->dev, "%s: RESETEP\n", __func__);
2424		ret = proc_resetep(ps, p);
2425		if (ret >= 0)
2426			inode->i_mtime = current_time(inode);
2427		break;
2428
2429	case USBDEVFS_RESET:
2430		snoop(&dev->dev, "%s: RESET\n", __func__);
2431		ret = proc_resetdevice(ps);
2432		break;
2433
2434	case USBDEVFS_CLEAR_HALT:
2435		snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2436		ret = proc_clearhalt(ps, p);
2437		if (ret >= 0)
2438			inode->i_mtime = current_time(inode);
2439		break;
2440
2441	case USBDEVFS_GETDRIVER:
2442		snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2443		ret = proc_getdriver(ps, p);
2444		break;
2445
2446	case USBDEVFS_CONNECTINFO:
2447		snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2448		ret = proc_connectinfo(ps, p);
2449		break;
2450
2451	case USBDEVFS_SETINTERFACE:
2452		snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2453		ret = proc_setintf(ps, p);
2454		break;
2455
2456	case USBDEVFS_SETCONFIGURATION:
2457		snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2458		ret = proc_setconfig(ps, p);
2459		break;
2460
2461	case USBDEVFS_SUBMITURB:
2462		snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2463		ret = proc_submiturb(ps, p);
2464		if (ret >= 0)
2465			inode->i_mtime = current_time(inode);
2466		break;
2467
2468#ifdef CONFIG_COMPAT
2469	case USBDEVFS_CONTROL32:
2470		snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2471		ret = proc_control_compat(ps, p);
2472		if (ret >= 0)
2473			inode->i_mtime = current_time(inode);
2474		break;
2475
2476	case USBDEVFS_BULK32:
2477		snoop(&dev->dev, "%s: BULK32\n", __func__);
2478		ret = proc_bulk_compat(ps, p);
2479		if (ret >= 0)
2480			inode->i_mtime = current_time(inode);
2481		break;
2482
2483	case USBDEVFS_DISCSIGNAL32:
2484		snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2485		ret = proc_disconnectsignal_compat(ps, p);
2486		break;
2487
2488	case USBDEVFS_SUBMITURB32:
2489		snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2490		ret = proc_submiturb_compat(ps, p);
2491		if (ret >= 0)
2492			inode->i_mtime = current_time(inode);
2493		break;
2494
2495	case USBDEVFS_IOCTL32:
2496		snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2497		ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2498		break;
2499#endif
2500
2501	case USBDEVFS_DISCARDURB:
2502		snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2503		ret = proc_unlinkurb(ps, p);
2504		break;
2505
2506	case USBDEVFS_DISCSIGNAL:
2507		snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2508		ret = proc_disconnectsignal(ps, p);
2509		break;
2510
2511	case USBDEVFS_CLAIMINTERFACE:
2512		snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2513		ret = proc_claiminterface(ps, p);
2514		break;
2515
2516	case USBDEVFS_RELEASEINTERFACE:
2517		snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2518		ret = proc_releaseinterface(ps, p);
2519		break;
2520
2521	case USBDEVFS_IOCTL:
2522		snoop(&dev->dev, "%s: IOCTL\n", __func__);
2523		ret = proc_ioctl_default(ps, p);
2524		break;
2525
2526	case USBDEVFS_CLAIM_PORT:
2527		snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2528		ret = proc_claim_port(ps, p);
2529		break;
2530
2531	case USBDEVFS_RELEASE_PORT:
2532		snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2533		ret = proc_release_port(ps, p);
2534		break;
2535	case USBDEVFS_GET_CAPABILITIES:
2536		ret = proc_get_capabilities(ps, p);
2537		break;
2538	case USBDEVFS_DISCONNECT_CLAIM:
2539		ret = proc_disconnect_claim(ps, p);
2540		break;
2541	case USBDEVFS_ALLOC_STREAMS:
2542		ret = proc_alloc_streams(ps, p);
2543		break;
2544	case USBDEVFS_FREE_STREAMS:
2545		ret = proc_free_streams(ps, p);
2546		break;
2547	case USBDEVFS_DROP_PRIVILEGES:
2548		ret = proc_drop_privileges(ps, p);
2549		break;
2550	}
2551
2552 done:
2553	usb_unlock_device(dev);
2554	if (ret >= 0)
2555		inode->i_atime = current_time(inode);
2556	return ret;
2557}
2558
2559static long usbdev_ioctl(struct file *file, unsigned int cmd,
2560			unsigned long arg)
2561{
2562	int ret;
2563
2564	ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2565
2566	return ret;
2567}
2568
2569#ifdef CONFIG_COMPAT
2570static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2571			unsigned long arg)
2572{
2573	int ret;
2574
2575	ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2576
2577	return ret;
2578}
2579#endif
2580
2581/* No kernel lock - fine */
2582static unsigned int usbdev_poll(struct file *file,
2583				struct poll_table_struct *wait)
2584{
2585	struct usb_dev_state *ps = file->private_data;
2586	unsigned int mask = 0;
2587
2588	poll_wait(file, &ps->wait, wait);
2589	if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2590		mask |= POLLOUT | POLLWRNORM;
2591	if (!connected(ps))
2592		mask |= POLLHUP;
2593	if (list_empty(&ps->list))
2594		mask |= POLLERR;
2595	return mask;
2596}
2597
2598const struct file_operations usbdev_file_operations = {
2599	.owner =	  THIS_MODULE,
2600	.llseek =	  no_seek_end_llseek,
2601	.read =		  usbdev_read,
2602	.poll =		  usbdev_poll,
2603	.unlocked_ioctl = usbdev_ioctl,
2604#ifdef CONFIG_COMPAT
2605	.compat_ioctl =   usbdev_compat_ioctl,
2606#endif
2607	.mmap =           usbdev_mmap,
2608	.open =		  usbdev_open,
2609	.release =	  usbdev_release,
2610};
2611
2612static void usbdev_remove(struct usb_device *udev)
2613{
2614	struct usb_dev_state *ps;
2615	struct siginfo sinfo;
2616
2617	while (!list_empty(&udev->filelist)) {
2618		ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2619		destroy_all_async(ps);
2620		wake_up_all(&ps->wait);
2621		list_del_init(&ps->list);
2622		if (ps->discsignr) {
2623			memset(&sinfo, 0, sizeof(sinfo));
2624			sinfo.si_signo = ps->discsignr;
2625			sinfo.si_errno = EPIPE;
2626			sinfo.si_code = SI_ASYNCIO;
2627			sinfo.si_addr = ps->disccontext;
2628			kill_pid_info_as_cred(ps->discsignr, &sinfo,
2629					ps->disc_pid, ps->cred, ps->secid);
2630		}
2631	}
2632}
2633
2634static int usbdev_notify(struct notifier_block *self,
2635			       unsigned long action, void *dev)
2636{
2637	switch (action) {
2638	case USB_DEVICE_ADD:
2639		break;
2640	case USB_DEVICE_REMOVE:
2641		usbdev_remove(dev);
2642		break;
2643	}
2644	return NOTIFY_OK;
2645}
2646
2647static struct notifier_block usbdev_nb = {
2648	.notifier_call =	usbdev_notify,
2649};
2650
2651static struct cdev usb_device_cdev;
2652
2653int __init usb_devio_init(void)
2654{
2655	int retval;
2656
2657	retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2658					"usb_device");
2659	if (retval) {
2660		printk(KERN_ERR "Unable to register minors for usb_device\n");
2661		goto out;
2662	}
2663	cdev_init(&usb_device_cdev, &usbdev_file_operations);
2664	retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2665	if (retval) {
2666		printk(KERN_ERR "Unable to get usb_device major %d\n",
2667		       USB_DEVICE_MAJOR);
2668		goto error_cdev;
2669	}
2670	usb_register_notify(&usbdev_nb);
2671out:
2672	return retval;
2673
2674error_cdev:
2675	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2676	goto out;
2677}
2678
2679void usb_devio_cleanup(void)
2680{
2681	usb_unregister_notify(&usbdev_nb);
2682	cdev_del(&usb_device_cdev);
2683	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2684}