linux - drivers/usb/core/devio.c

2933 lines · 71.4 KiB

1	// SPDX-License-Identifier: GPL-2.0+
2	/*****************************************************************************/
3
4	/*
5	* devio.c -- User space communication with USB devices.
6	*
7	* Copyright (C) 1999-2000 Thomas Sailer ([email protected])
8	*
9	* This file implements the usbfs/x/y files, where
10	* x is the bus number and y the device number.
11	*
12	* It allows user space programs/"drivers" to communicate directly
13	* with USB devices without intervening kernel driver.
14	*
15	* Revision history
16	* 22.12.1999 0.1 Initial release (split from proc_usb.c)
17	* 04.01.2000 0.2 Turned into its own filesystem
18	* 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19	* (CAN-2005-3055)
20	*/
21
22	/*****************************************************************************/
23
24	#include <linux/fs.h>
25	#include <linux/mm.h>
26	#include <linux/sched/signal.h>
27	#include <linux/slab.h>
28	#include <linux/signal.h>
29	#include <linux/poll.h>
30	#include <linux/module.h>
31	#include <linux/string.h>
32	#include <linux/usb.h>
33	#include <linux/usbdevice_fs.h>
34	#include <linux/usb/hcd.h> /* for usbcore internals */
35	#include <linux/usb/quirks.h>
36	#include <linux/cdev.h>
37	#include <linux/notifier.h>
38	#include <linux/security.h>
39	#include <linux/user_namespace.h>
40	#include <linux/scatterlist.h>
41	#include <linux/uaccess.h>
42	#include <linux/dma-mapping.h>
43	#include <asm/byteorder.h>
44	#include <linux/moduleparam.h>
45
46	#include "usb.h"
47
48	#ifdef CONFIG_PM
49	#define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
50	#else
51	#define MAYBE_CAP_SUSPEND 0
52	#endif
53
54	#define USB_MAXBUS 64
55	#define USB_DEVICE_MAX (USB_MAXBUS * 128)
56	#define USB_SG_SIZE 16384 /* split-size for large txs */
57
58	/* Mutual exclusion for ps->list in resume vs. release and remove */
59	static DEFINE_MUTEX(usbfs_mutex);
60
61	struct usb_dev_state {
62	struct list_head list; /* state list */
63	struct usb_device *dev;
64	struct file *file;
65	spinlock_t lock; /* protects the async urb lists */
66	struct list_head async_pending;
67	struct list_head async_completed;
68	struct list_head memory_list;
69	wait_queue_head_t wait; /* wake up if a request completed */
70	wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
71	unsigned int discsignr;
72	struct pid *disc_pid;
73	const struct cred *cred;
74	sigval_t disccontext;
75	unsigned long ifclaimed;
76	u32 disabled_bulk_eps;
77	unsigned long interface_allowed_mask;
78	int not_yet_resumed;
79	bool suspend_allowed;
80	bool privileges_dropped;
81	};
82
83	struct usb_memory {
84	struct list_head memlist;
85	int vma_use_count;
86	int urb_use_count;
87	u32 size;
88	void *mem;
89	dma_addr_t dma_handle;
90	unsigned long vm_start;
91	struct usb_dev_state *ps;
92	};
93
94	struct async {
95	struct list_head asynclist;
96	struct usb_dev_state *ps;
97	struct pid *pid;
98	const struct cred *cred;
99	unsigned int signr;
100	unsigned int ifnum;
101	void __user *userbuffer;
102	void __user *userurb;
103	sigval_t userurb_sigval;
104	struct urb *urb;
105	struct usb_memory *usbm;
106	unsigned int mem_usage;
107	int status;
108	u8 bulk_addr;
109	u8 bulk_status;
110	};
111
112	static bool usbfs_snoop;
113	module_param(usbfs_snoop, bool, S_IRUGO \| S_IWUSR);
114	MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
115
116	static unsigned usbfs_snoop_max = 65536;
117	module_param(usbfs_snoop_max, uint, S_IRUGO \| S_IWUSR);
118	MODULE_PARM_DESC(usbfs_snoop_max,
119	"maximum number of bytes to print while snooping");
120
121	#define snoop(dev, format, arg...) \
122	do { \
123	if (usbfs_snoop) \
124	dev_info(dev, format, ## arg); \
125	} while (0)
126
127	enum snoop_when {
128	SUBMIT, COMPLETE
129	};
130
131	#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
132
133	/* Limit on the total amount of memory we can allocate for transfers */
134	static u32 usbfs_memory_mb = 16;
135	module_param(usbfs_memory_mb, uint, 0644);
136	MODULE_PARM_DESC(usbfs_memory_mb,
137	"maximum MB allowed for usbfs buffers (0 = no limit)");
138
139	/* Hard limit, necessary to avoid arithmetic overflow */
140	#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
141
142	static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
143	static u64 usbfs_memory_usage; /* Total memory currently allocated */
144
145	/* Check whether it's okay to allocate more memory for a transfer */
146	static int usbfs_increase_memory_usage(u64 amount)
147	{
148	u64 lim, total_mem;
149	unsigned long flags;
150	int ret;
151
152	lim = READ_ONCE(usbfs_memory_mb);
153	lim <<= 20;
154
155	ret = 0;
156	spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
157	total_mem = usbfs_memory_usage + amount;
158	if (lim > 0 && total_mem > lim)
159	ret = -ENOMEM;
160	else
161	usbfs_memory_usage = total_mem;
162	spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
163
164	return ret;
165	}
166
167	/* Memory for a transfer is being deallocated */
168	static void usbfs_decrease_memory_usage(u64 amount)
169	{
170	unsigned long flags;
171
172	spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
173	if (amount > usbfs_memory_usage)
174	usbfs_memory_usage = 0;
175	else
176	usbfs_memory_usage -= amount;
177	spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
178	}
179
180	static int connected(struct usb_dev_state *ps)
181	{
182	return (!list_empty(&ps->list) &&
183	ps->dev->state != USB_STATE_NOTATTACHED);
184	}
185
186	static void dec_usb_memory_use_count(struct usb_memory usbm, int count)
187	{
188	struct usb_dev_state *ps = usbm->ps;
189	struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
190	unsigned long flags;
191
192	spin_lock_irqsave(&ps->lock, flags);
193	--*count;
194	if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
195	list_del(&usbm->memlist);
196	spin_unlock_irqrestore(&ps->lock, flags);
197
198	hcd_buffer_free_pages(hcd, usbm->size,
199	usbm->mem, usbm->dma_handle);
200	usbfs_decrease_memory_usage(
201	usbm->size + sizeof(struct usb_memory));
202	kfree(usbm);
203	} else {
204	spin_unlock_irqrestore(&ps->lock, flags);
205	}
206	}
207
208	static void usbdev_vm_open(struct vm_area_struct *vma)
209	{
210	struct usb_memory *usbm = vma->vm_private_data;
211	unsigned long flags;
212
213	spin_lock_irqsave(&usbm->ps->lock, flags);
214	++usbm->vma_use_count;
215	spin_unlock_irqrestore(&usbm->ps->lock, flags);
216	}
217
218	static void usbdev_vm_close(struct vm_area_struct *vma)
219	{
220	struct usb_memory *usbm = vma->vm_private_data;
221
222	dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
223	}
224
225	static const struct vm_operations_struct usbdev_vm_ops = {
226	.open = usbdev_vm_open,
227	.close = usbdev_vm_close
228	};
229
230	static int usbdev_mmap(struct file file, struct vm_area_struct vma)
231	{
232	struct usb_memory *usbm = NULL;
233	struct usb_dev_state *ps = file->private_data;
234	struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
235	size_t size = vma->vm_end - vma->vm_start;
236	void *mem;
237	unsigned long flags;
238	dma_addr_t dma_handle = DMA_MAPPING_ERROR;
239	int ret;
240
241	if (!(file->f_mode & FMODE_WRITE))
242	return -EPERM;
243
244	ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
245	if (ret)
246	goto error;
247
248	usbm = kzalloc_obj(struct usb_memory);
249	if (!usbm) {
250	ret = -ENOMEM;
251	goto error_decrease_mem;
252	}
253
254	mem = hcd_buffer_alloc_pages(hcd,
255	size, GFP_USER \| __GFP_NOWARN, &dma_handle);
256	if (!mem) {
257	ret = -ENOMEM;
258	goto error_free_usbm;
259	}
260
261	memset(mem, 0, size);
262
263	usbm->mem = mem;
264	usbm->dma_handle = dma_handle;
265	usbm->size = size;
266	usbm->ps = ps;
267	usbm->vm_start = vma->vm_start;
268	usbm->vma_use_count = 1;
269	INIT_LIST_HEAD(&usbm->memlist);
270
271	/*
272	* In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
273	* normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
274	* whether we are in such cases, and then use remap_pfn_range (or
275	* dma_mmap_coherent) to map normal (or DMA) pages into the user
276	* space, respectively.
277	*/
278	if (dma_handle == DMA_MAPPING_ERROR) {
279	if (remap_pfn_range(vma, vma->vm_start,
280	virt_to_phys(usbm->mem) >> PAGE_SHIFT,
281	size, vma->vm_page_prot) < 0) {
282	dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
283	return -EAGAIN;
284	}
285	} else {
286	if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
287	size)) {
288	dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
289	return -EAGAIN;
290	}
291	}
292
293	vm_flags_set(vma, VM_IO \| VM_DONTEXPAND \| VM_DONTDUMP);
294	vma->vm_ops = &usbdev_vm_ops;
295	vma->vm_private_data = usbm;
296
297	spin_lock_irqsave(&ps->lock, flags);
298	list_add_tail(&usbm->memlist, &ps->memory_list);
299	spin_unlock_irqrestore(&ps->lock, flags);
300
301	return 0;
302
303	error_free_usbm:
304	kfree(usbm);
305	error_decrease_mem:
306	usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
307	error:
308	return ret;
309	}
310
311	static ssize_t usbdev_read(struct file file, char __user buf, size_t nbytes,
312	loff_t *ppos)
313	{
314	struct usb_dev_state *ps = file->private_data;
315	struct usb_device *dev = ps->dev;
316	ssize_t ret = 0;
317	unsigned len;
318	loff_t pos;
319	int i;
320
321	pos = *ppos;
322	usb_lock_device(dev);
323	if (!connected(ps)) {
324	ret = -ENODEV;
325	goto err;
326	} else if (pos < 0) {
327	ret = -EINVAL;
328	goto err;
329	}
330
331	if (pos < sizeof(struct usb_device_descriptor)) {
332	/* 18 bytes - fits on the stack */
333	struct usb_device_descriptor temp_desc;
334
335	memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
336	le16_to_cpus(&temp_desc.bcdUSB);
337	le16_to_cpus(&temp_desc.idVendor);
338	le16_to_cpus(&temp_desc.idProduct);
339	le16_to_cpus(&temp_desc.bcdDevice);
340
341	len = sizeof(struct usb_device_descriptor) - pos;
342	if (len > nbytes)
343	len = nbytes;
344	if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
345	ret = -EFAULT;
346	goto err;
347	}
348
349	*ppos += len;
350	buf += len;
351	nbytes -= len;
352	ret += len;
353	}
354
355	pos = sizeof(struct usb_device_descriptor);
356	for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
357	struct usb_config_descriptor *config =
358	(struct usb_config_descriptor *)dev->rawdescriptors[i];
359	unsigned int length = le16_to_cpu(config->wTotalLength);
360
361	if (*ppos < pos + length) {
362
363	/* The descriptor may claim to be longer than it
364	* really is. Here is the actual allocated length. */
365	unsigned alloclen =
366	le16_to_cpu(dev->config[i].desc.wTotalLength);
367
368	len = length - (*ppos - pos);
369	if (len > nbytes)
370	len = nbytes;
371
372	/* Simply don't write (skip over) unallocated parts */
373	if (alloclen > (*ppos - pos)) {
374	alloclen -= (*ppos - pos);
375	if (copy_to_user(buf,
376	dev->rawdescriptors[i] + (*ppos - pos),
377	min(len, alloclen))) {
378	ret = -EFAULT;
379	goto err;
380	}
381	}
382
383	*ppos += len;
384	buf += len;
385	nbytes -= len;
386	ret += len;
387	}
388
389	pos += length;
390	}
391
392	err:
393	usb_unlock_device(dev);
394	return ret;
395	}
396
397	/*
398	* async list handling
399	*/
400
401	static struct async *alloc_async(unsigned int numisoframes)
402	{
403	struct async *as;
404
405	as = kzalloc_obj(struct async);
406	if (!as)
407	return NULL;
408	as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
409	if (!as->urb) {
410	kfree(as);
411	return NULL;
412	}
413	return as;
414	}
415
416	static void free_async(struct async *as)
417	{
418	int i;
419
420	put_pid(as->pid);
421	if (as->cred)
422	put_cred(as->cred);
423	for (i = 0; i < as->urb->num_sgs; i++) {
424	if (sg_page(&as->urb->sg[i]))
425	kfree(sg_virt(&as->urb->sg[i]));
426	}
427
428	kfree(as->urb->sg);
429	if (as->usbm == NULL)
430	kfree(as->urb->transfer_buffer);
431	else
432	dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
433
434	kfree(as->urb->setup_packet);
435	usb_free_urb(as->urb);
436	usbfs_decrease_memory_usage(as->mem_usage);
437	kfree(as);
438	}
439
440	static void async_newpending(struct async *as)
441	{
442	struct usb_dev_state *ps = as->ps;
443	unsigned long flags;
444
445	spin_lock_irqsave(&ps->lock, flags);
446	list_add_tail(&as->asynclist, &ps->async_pending);
447	spin_unlock_irqrestore(&ps->lock, flags);
448	}
449
450	static void async_removepending(struct async *as)
451	{
452	struct usb_dev_state *ps = as->ps;
453	unsigned long flags;
454
455	spin_lock_irqsave(&ps->lock, flags);
456	list_del_init(&as->asynclist);
457	spin_unlock_irqrestore(&ps->lock, flags);
458	}
459
460	static struct async async_getcompleted(struct usb_dev_state ps)
461	{
462	unsigned long flags;
463	struct async *as = NULL;
464
465	spin_lock_irqsave(&ps->lock, flags);
466	if (!list_empty(&ps->async_completed)) {
467	as = list_entry(ps->async_completed.next, struct async,
468	asynclist);
469	list_del_init(&as->asynclist);
470	}
471	spin_unlock_irqrestore(&ps->lock, flags);
472	return as;
473	}
474
475	static struct async async_getpending(struct usb_dev_state ps,
476	void __user *userurb)
477	{
478	struct async *as;
479
480	list_for_each_entry(as, &ps->async_pending, asynclist)
481	if (as->userurb == userurb) {
482	list_del_init(&as->asynclist);
483	return as;
484	}
485
486	return NULL;
487	}
488
489	static void snoop_urb(struct usb_device *udev,
490	void __user *userurb, int pipe, unsigned length,
491	int timeout_or_status, enum snoop_when when,
492	unsigned char *data, unsigned data_len)
493	{
494	static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
495	static const char *dirs[] = {"out", "in"};
496	int ep;
497	const char t, d;
498
499	if (!usbfs_snoop)
500	return;
501
502	ep = usb_pipeendpoint(pipe);
503	t = types[usb_pipetype(pipe)];
504	d = dirs[!!usb_pipein(pipe)];
505
506	if (userurb) { /* Async */
507	if (when == SUBMIT)
508	dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
509	"length %u\n",
510	userurb, ep, t, d, length);
511	else
512	dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
513	"actual_length %u status %d\n",
514	userurb, ep, t, d, length,
515	timeout_or_status);
516	} else {
517	if (when == SUBMIT)
518	dev_info(&udev->dev, "ep%d %s-%s, length %u, "
519	"timeout %d\n",
520	ep, t, d, length, timeout_or_status);
521	else
522	dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
523	"status %d\n",
524	ep, t, d, length, timeout_or_status);
525	}
526
527	data_len = min(data_len, usbfs_snoop_max);
528	if (data && data_len > 0) {
529	print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
530	data, data_len, 1);
531	}
532	}
533
534	static void snoop_urb_data(struct urb *urb, unsigned len)
535	{
536	int i, size;
537
538	len = min(len, usbfs_snoop_max);
539	if (!usbfs_snoop \|\| len == 0)
540	return;
541
542	if (urb->num_sgs == 0) {
543	print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
544	urb->transfer_buffer, len, 1);
545	return;
546	}
547
548	for (i = 0; i < urb->num_sgs && len; i++) {
549	size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
550	print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
551	sg_virt(&urb->sg[i]), size, 1);
552	len -= size;
553	}
554	}
555
556	static int copy_urb_data_to_user(u8 __user userbuffer, struct urb urb)
557	{
558	unsigned i, len, size;
559
560	if (urb->number_of_packets > 0) /* Isochronous */
561	len = urb->transfer_buffer_length;
562	else /* Non-Isoc */
563	len = urb->actual_length;
564
565	if (urb->num_sgs == 0) {
566	if (copy_to_user(userbuffer, urb->transfer_buffer, len))
567	return -EFAULT;
568	return 0;
569	}
570
571	for (i = 0; i < urb->num_sgs && len; i++) {
572	size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
573	if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
574	return -EFAULT;
575	userbuffer += size;
576	len -= size;
577	}
578
579	return 0;
580	}
581
582	#define AS_CONTINUATION 1
583	#define AS_UNLINK 2
584
585	static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
586	__releases(ps->lock)
587	__acquires(ps->lock)
588	{
589	struct urb *urb;
590	struct async *as;
591
592	/* Mark all the pending URBs that match bulk_addr, up to but not
593	* including the first one without AS_CONTINUATION. If such an
594	* URB is encountered then a new transfer has already started so
595	* the endpoint doesn't need to be disabled; otherwise it does.
596	*/
597	list_for_each_entry(as, &ps->async_pending, asynclist) {
598	if (as->bulk_addr == bulk_addr) {
599	if (as->bulk_status != AS_CONTINUATION)
600	goto rescan;
601	as->bulk_status = AS_UNLINK;
602	as->bulk_addr = 0;
603	}
604	}
605	ps->disabled_bulk_eps \|= (1 << bulk_addr);
606
607	/* Now carefully unlink all the marked pending URBs */
608	rescan:
609	list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
610	if (as->bulk_status == AS_UNLINK) {
611	as->bulk_status = 0; /* Only once */
612	urb = as->urb;
613	usb_get_urb(urb);
614	spin_unlock(&ps->lock); /* Allow completions */
615	usb_unlink_urb(urb);
616	usb_put_urb(urb);
617	spin_lock(&ps->lock);
618	goto rescan;
619	}
620	}
621	}
622
623	static void async_completed(struct urb *urb)
624	{
625	struct async *as = urb->context;
626	struct usb_dev_state *ps = as->ps;
627	struct pid *pid = NULL;
628	const struct cred *cred = NULL;
629	unsigned long flags;
630	sigval_t addr;
631	int signr, errno;
632
633	spin_lock_irqsave(&ps->lock, flags);
634	list_move_tail(&as->asynclist, &ps->async_completed);
635	as->status = urb->status;
636	signr = as->signr;
637	if (signr) {
638	errno = as->status;
639	addr = as->userurb_sigval;
640	pid = get_pid(as->pid);
641	cred = get_cred(as->cred);
642	}
643	snoop(&urb->dev->dev, "urb complete\n");
644	snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
645	as->status, COMPLETE, NULL, 0);
646	if (usb_urb_dir_in(urb))
647	snoop_urb_data(urb, urb->actual_length);
648
649	if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
650	as->status != -ENOENT)
651	cancel_bulk_urbs(ps, as->bulk_addr);
652
653	wake_up(&ps->wait);
654	spin_unlock_irqrestore(&ps->lock, flags);
655
656	if (signr) {
657	kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
658	put_pid(pid);
659	put_cred(cred);
660	}
661	}
662
663	static void destroy_async(struct usb_dev_state ps, struct list_head list)
664	{
665	struct urb *urb;
666	struct async *as;
667	unsigned long flags;
668
669	spin_lock_irqsave(&ps->lock, flags);
670	while (!list_empty(list)) {
671	as = list_last_entry(list, struct async, asynclist);
672	list_del_init(&as->asynclist);
673	urb = as->urb;
674	usb_get_urb(urb);
675
676	/* drop the spinlock so the completion handler can run */
677	spin_unlock_irqrestore(&ps->lock, flags);
678	usb_kill_urb(urb);
679	usb_put_urb(urb);
680	spin_lock_irqsave(&ps->lock, flags);
681	}
682	spin_unlock_irqrestore(&ps->lock, flags);
683	}
684
685	static void destroy_async_on_interface(struct usb_dev_state *ps,
686	unsigned int ifnum)
687	{
688	struct list_head p, q, hitlist;
689	unsigned long flags;
690
691	INIT_LIST_HEAD(&hitlist);
692	spin_lock_irqsave(&ps->lock, flags);
693	list_for_each_safe(p, q, &ps->async_pending)
694	if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
695	list_move_tail(p, &hitlist);
696	spin_unlock_irqrestore(&ps->lock, flags);
697	destroy_async(ps, &hitlist);
698	}
699
700	static void destroy_all_async(struct usb_dev_state *ps)
701	{
702	destroy_async(ps, &ps->async_pending);
703	}
704
705	/*
706	* interface claims are made only at the request of user level code,
707	* which can also release them (explicitly or by closing files).
708	* they're also undone when devices disconnect.
709	*/
710
711	static int driver_probe(struct usb_interface *intf,
712	const struct usb_device_id *id)
713	{
714	return -ENODEV;
715	}
716
717	static void driver_disconnect(struct usb_interface *intf)
718	{
719	struct usb_dev_state *ps = usb_get_intfdata(intf);
720	unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
721
722	if (!ps)
723	return;
724
725	/* NOTE: this relies on usbcore having canceled and completed
726	* all pending I/O requests; 2.6 does that.
727	*/
728
729	if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
730	clear_bit(ifnum, &ps->ifclaimed);
731	else
732	dev_warn(&intf->dev, "interface number %u out of range\n",
733	ifnum);
734
735	usb_set_intfdata(intf, NULL);
736
737	/* force async requests to complete */
738	destroy_async_on_interface(ps, ifnum);
739	}
740
741	/* We don't care about suspend/resume of claimed interfaces */
742	static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
743	{
744	return 0;
745	}
746
747	static int driver_resume(struct usb_interface *intf)
748	{
749	return 0;
750	}
751
752	#ifdef CONFIG_PM
753	/* The following routines apply to the entire device, not interfaces */
754	void usbfs_notify_suspend(struct usb_device *udev)
755	{
756	/* We don't need to handle this */
757	}
758
759	void usbfs_notify_resume(struct usb_device *udev)
760	{
761	struct usb_dev_state *ps;
762
763	/* Protect against simultaneous remove or release */
764	mutex_lock(&usbfs_mutex);
765	list_for_each_entry(ps, &udev->filelist, list) {
766	WRITE_ONCE(ps->not_yet_resumed, 0);
767	wake_up_all(&ps->wait_for_resume);
768	}
769	mutex_unlock(&usbfs_mutex);
770	}
771	#endif
772
773	struct usb_driver usbfs_driver = {
774	.name = "usbfs",
775	.probe = driver_probe,
776	.disconnect = driver_disconnect,
777	.suspend = driver_suspend,
778	.resume = driver_resume,
779	.supports_autosuspend = 1,
780	};
781
782	static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
783	{
784	struct usb_device *dev = ps->dev;
785	struct usb_interface *intf;
786	int err;
787
788	if (ifnum >= 8*sizeof(ps->ifclaimed))
789	return -EINVAL;
790	/* already claimed */
791	if (test_bit(ifnum, &ps->ifclaimed))
792	return 0;
793
794	if (ps->privileges_dropped &&
795	!test_bit(ifnum, &ps->interface_allowed_mask))
796	return -EACCES;
797
798	intf = usb_ifnum_to_if(dev, ifnum);
799	if (!intf)
800	err = -ENOENT;
801	else {
802	unsigned int old_suppress;
803
804	/* suppress uevents while claiming interface */
805	old_suppress = dev_get_uevent_suppress(&intf->dev);
806	dev_set_uevent_suppress(&intf->dev, 1);
807	err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
808	dev_set_uevent_suppress(&intf->dev, old_suppress);
809	}
810	if (err == 0)
811	set_bit(ifnum, &ps->ifclaimed);
812	return err;
813	}
814
815	static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
816	{
817	struct usb_device *dev;
818	struct usb_interface *intf;
819	int err;
820
821	err = -EINVAL;
822	if (ifnum >= 8*sizeof(ps->ifclaimed))
823	return err;
824	dev = ps->dev;
825	intf = usb_ifnum_to_if(dev, ifnum);
826	if (!intf)
827	err = -ENOENT;
828	else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
829	unsigned int old_suppress;
830
831	/* suppress uevents while releasing interface */
832	old_suppress = dev_get_uevent_suppress(&intf->dev);
833	dev_set_uevent_suppress(&intf->dev, 1);
834	usb_driver_release_interface(&usbfs_driver, intf);
835	dev_set_uevent_suppress(&intf->dev, old_suppress);
836	err = 0;
837	}
838	return err;
839	}
840
841	static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
842	{
843	if (ps->dev->state != USB_STATE_CONFIGURED)
844	return -EHOSTUNREACH;
845	if (ifnum >= 8*sizeof(ps->ifclaimed))
846	return -EINVAL;
847	if (test_bit(ifnum, &ps->ifclaimed))
848	return 0;
849	/* if not yet claimed, claim it for the driver */
850	dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
851	"interface %u before use\n", task_pid_nr(current),
852	current->comm, ifnum);
853	return claimintf(ps, ifnum);
854	}
855
856	static int findintfep(struct usb_device *dev, unsigned int ep)
857	{
858	unsigned int i, j, e;
859	struct usb_interface *intf;
860	struct usb_host_interface *alts;
861	struct usb_endpoint_descriptor *endpt;
862
863	if (ep & ~(USB_DIR_IN\|0xf))
864	return -EINVAL;
865	if (!dev->actconfig)
866	return -ESRCH;
867	for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
868	intf = dev->actconfig->interface[i];
869	for (j = 0; j < intf->num_altsetting; j++) {
870	alts = &intf->altsetting[j];
871	for (e = 0; e < alts->desc.bNumEndpoints; e++) {
872	endpt = &alts->endpoint[e].desc;
873	if (endpt->bEndpointAddress == ep)
874	return alts->desc.bInterfaceNumber;
875	}
876	}
877	}
878	return -ENOENT;
879	}
880
881	static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
882	unsigned int request, unsigned int index)
883	{
884	int ret = 0;
885	struct usb_host_interface *alt_setting;
886
887	if (ps->dev->state != USB_STATE_UNAUTHENTICATED
888	&& ps->dev->state != USB_STATE_ADDRESS
889	&& ps->dev->state != USB_STATE_CONFIGURED)
890	return -EHOSTUNREACH;
891	if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
892	return 0;
893
894	/*
895	* check for the special corner case 'get_device_id' in the printer
896	* class specification, which we always want to allow as it is used
897	* to query things like ink level, etc.
898	*/
899	if (requesttype == 0xa1 && request == 0) {
900	alt_setting = usb_find_alt_setting(ps->dev->actconfig,
901	index >> 8, index & 0xff);
902	if (alt_setting
903	&& alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
904	return 0;
905	}
906
907	index &= 0xff;
908	switch (requesttype & USB_RECIP_MASK) {
909	case USB_RECIP_ENDPOINT:
910	if ((index & ~USB_DIR_IN) == 0)
911	return 0;
912	ret = findintfep(ps->dev, index);
913	if (ret < 0) {
914	/*
915	* Some not fully compliant Win apps seem to get
916	* index wrong and have the endpoint number here
917	* rather than the endpoint address (with the
918	* correct direction). Win does let this through,
919	* so we'll not reject it here but leave it to
920	* the device to not break KVM. But we warn.
921	*/
922	ret = findintfep(ps->dev, index ^ 0x80);
923	if (ret >= 0)
924	dev_info(&ps->dev->dev,
925	"%s: process %i (%s) requesting ep %02x but needs %02x\n",
926	__func__, task_pid_nr(current),
927	current->comm, index, index ^ 0x80);
928	}
929	if (ret >= 0)
930	ret = checkintf(ps, ret);
931	break;
932
933	case USB_RECIP_INTERFACE:
934	ret = checkintf(ps, index);
935	break;
936	}
937	return ret;
938	}
939
940	static struct usb_host_endpoint ep_to_host_endpoint(struct usb_device dev,
941	unsigned char ep)
942	{
943	if (ep & USB_ENDPOINT_DIR_MASK)
944	return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
945	else
946	return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
947	}
948
949	static int parse_usbdevfs_streams(struct usb_dev_state *ps,
950	struct usbdevfs_streams __user *streams,
951	unsigned int *num_streams_ret,
952	unsigned int *num_eps_ret,
953	struct usb_host_endpoint ***eps_ret,
954	struct usb_interface **intf_ret)
955	{
956	unsigned int i, num_streams, num_eps;
957	struct usb_host_endpoint **eps;
958	struct usb_interface *intf = NULL;
959	unsigned char ep;
960	int ifnum, ret;
961
962	if (get_user(num_streams, &streams->num_streams) \|\|
963	get_user(num_eps, &streams->num_eps))
964	return -EFAULT;
965
966	if (num_eps < 1 \|\| num_eps > USB_MAXENDPOINTS)
967	return -EINVAL;
968
969	/* The XHCI controller allows max 2 ^ 16 streams */
970	if (num_streams_ret && (num_streams < 2 \|\| num_streams > 65536))
971	return -EINVAL;
972
973	eps = kmalloc_objs(*eps, num_eps);
974	if (!eps)
975	return -ENOMEM;
976
977	for (i = 0; i < num_eps; i++) {
978	if (get_user(ep, &streams->eps[i])) {
979	ret = -EFAULT;
980	goto error;
981	}
982	eps[i] = ep_to_host_endpoint(ps->dev, ep);
983	if (!eps[i]) {
984	ret = -EINVAL;
985	goto error;
986	}
987
988	/* usb_alloc/free_streams operate on an usb_interface */
989	ifnum = findintfep(ps->dev, ep);
990	if (ifnum < 0) {
991	ret = ifnum;
992	goto error;
993	}
994
995	if (i == 0) {
996	ret = checkintf(ps, ifnum);
997	if (ret < 0)
998	goto error;
999	intf = usb_ifnum_to_if(ps->dev, ifnum);
1000	} else {
1001	/* Verify all eps belong to the same interface */
1002	if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
1003	ret = -EINVAL;
1004	goto error;
1005	}
1006	}
1007	}
1008
1009	if (num_streams_ret)
1010	*num_streams_ret = num_streams;
1011	*num_eps_ret = num_eps;
1012	*eps_ret = eps;
1013	*intf_ret = intf;
1014
1015	return 0;
1016
1017	error:
1018	kfree(eps);
1019	return ret;
1020	}
1021
1022	static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1023	{
1024	struct device *dev;
1025
1026	dev = bus_find_device_by_devt(&usb_bus_type, devt);
1027	if (!dev)
1028	return NULL;
1029	return to_usb_device(dev);
1030	}
1031
1032	/*
1033	* file operations
1034	*/
1035	static int usbdev_open(struct inode inode, struct file file)
1036	{
1037	struct usb_device *dev = NULL;
1038	struct usb_dev_state *ps;
1039	int ret;
1040
1041	ret = -ENOMEM;
1042	ps = kzalloc_obj(struct usb_dev_state);
1043	if (!ps)
1044	goto out_free_ps;
1045
1046	ret = -ENODEV;
1047
1048	/* usbdev device-node */
1049	if (imajor(inode) == USB_DEVICE_MAJOR)
1050	dev = usbdev_lookup_by_devt(inode->i_rdev);
1051	if (!dev)
1052	goto out_free_ps;
1053
1054	usb_lock_device(dev);
1055	if (dev->state == USB_STATE_NOTATTACHED)
1056	goto out_unlock_device;
1057
1058	ret = usb_autoresume_device(dev);
1059	if (ret)
1060	goto out_unlock_device;
1061
1062	ps->dev = dev;
1063	ps->file = file;
1064	ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1065	spin_lock_init(&ps->lock);
1066	INIT_LIST_HEAD(&ps->list);
1067	INIT_LIST_HEAD(&ps->async_pending);
1068	INIT_LIST_HEAD(&ps->async_completed);
1069	INIT_LIST_HEAD(&ps->memory_list);
1070	init_waitqueue_head(&ps->wait);
1071	init_waitqueue_head(&ps->wait_for_resume);
1072	ps->disc_pid = get_pid(task_pid(current));
1073	ps->cred = get_current_cred();
1074	smp_wmb();
1075
1076	/* Can't race with resume; the device is already active */
1077	list_add_tail(&ps->list, &dev->filelist);
1078	file->private_data = ps;
1079	usb_unlock_device(dev);
1080	snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1081	current->comm);
1082	return ret;
1083
1084	out_unlock_device:
1085	usb_unlock_device(dev);
1086	usb_put_dev(dev);
1087	out_free_ps:
1088	kfree(ps);
1089	return ret;
1090	}
1091
1092	static int usbdev_release(struct inode inode, struct file file)
1093	{
1094	struct usb_dev_state *ps = file->private_data;
1095	struct usb_device *dev = ps->dev;
1096	unsigned int ifnum;
1097	struct async *as;
1098
1099	usb_lock_device(dev);
1100	usb_hub_release_all_ports(dev, ps);
1101
1102	/* Protect against simultaneous resume */
1103	mutex_lock(&usbfs_mutex);
1104	list_del_init(&ps->list);
1105	mutex_unlock(&usbfs_mutex);
1106
1107	for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1108	ifnum++) {
1109	if (test_bit(ifnum, &ps->ifclaimed))
1110	releaseintf(ps, ifnum);
1111	}
1112	destroy_all_async(ps);
1113	if (!ps->suspend_allowed)
1114	usb_autosuspend_device(dev);
1115	usb_unlock_device(dev);
1116	put_pid(ps->disc_pid);
1117	put_cred(ps->cred);
1118
1119	as = async_getcompleted(ps);
1120	while (as) {
1121	free_async(as);
1122	as = async_getcompleted(ps);
1123	}
1124	usb_put_dev(dev);
1125
1126	kfree(ps);
1127	return 0;
1128	}
1129
1130	static void usbfs_blocking_completion(struct urb *urb)
1131	{
1132	complete((struct completion *) urb->context);
1133	}
1134
1135	/*
1136	* Much like usb_start_wait_urb, but returns status separately from
1137	* actual_length and uses a killable wait.
1138	*/
1139	static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1140	unsigned int *actlen)
1141	{
1142	DECLARE_COMPLETION_ONSTACK(ctx);
1143	unsigned long expire;
1144	int rc;
1145
1146	urb->context = &ctx;
1147	urb->complete = usbfs_blocking_completion;
1148	*actlen = 0;
1149	rc = usb_submit_urb(urb, GFP_KERNEL);
1150	if (unlikely(rc))
1151	return rc;
1152
1153	expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1154	rc = wait_for_completion_killable_timeout(&ctx, expire);
1155	if (rc <= 0) {
1156	usb_kill_urb(urb);
1157	*actlen = urb->actual_length;
1158	if (urb->status != -ENOENT)
1159	; /* Completed before it was killed */
1160	else if (rc < 0)
1161	return -EINTR;
1162	else
1163	return -ETIMEDOUT;
1164	}
1165	*actlen = urb->actual_length;
1166	return urb->status;
1167	}
1168
1169	static int do_proc_control(struct usb_dev_state *ps,
1170	struct usbdevfs_ctrltransfer *ctrl)
1171	{
1172	struct usb_device *dev = ps->dev;
1173	unsigned int tmo;
1174	unsigned char *tbuf;
1175	unsigned int wLength, actlen;
1176	int i, pipe, ret;
1177	struct urb *urb = NULL;
1178	struct usb_ctrlrequest *dr = NULL;
1179
1180	ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1181	ctrl->wIndex);
1182	if (ret)
1183	return ret;
1184	wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1185	if (wLength > PAGE_SIZE)
1186	return -EINVAL;
1187	ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1188	sizeof(struct usb_ctrlrequest));
1189	if (ret)
1190	return ret;
1191
1192	ret = -ENOMEM;
1193	tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1194	if (!tbuf)
1195	goto done;
1196	urb = usb_alloc_urb(0, GFP_NOIO);
1197	if (!urb)
1198	goto done;
1199	dr = kmalloc_obj(struct usb_ctrlrequest, GFP_NOIO);
1200	if (!dr)
1201	goto done;
1202
1203	dr->bRequestType = ctrl->bRequestType;
1204	dr->bRequest = ctrl->bRequest;
1205	dr->wValue = cpu_to_le16(ctrl->wValue);
1206	dr->wIndex = cpu_to_le16(ctrl->wIndex);
1207	dr->wLength = cpu_to_le16(ctrl->wLength);
1208
1209	tmo = ctrl->timeout;
1210	snoop(&dev->dev, "control urb: bRequestType=%02x "
1211	"bRequest=%02x wValue=%04x "
1212	"wIndex=%04x wLength=%04x\n",
1213	ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1214	ctrl->wIndex, ctrl->wLength);
1215
1216	if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1217	pipe = usb_rcvctrlpipe(dev, 0);
1218	usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1219	wLength, NULL, NULL);
1220	snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1221
1222	usb_unlock_device(dev);
1223	i = usbfs_start_wait_urb(urb, tmo, &actlen);
1224
1225	/* Linger a bit, prior to the next control message. */
1226	if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1227	msleep(200);
1228	usb_lock_device(dev);
1229	snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1230	if (!i && actlen) {
1231	if (copy_to_user(ctrl->data, tbuf, actlen)) {
1232	ret = -EFAULT;
1233	goto done;
1234	}
1235	}
1236	} else {
1237	if (wLength) {
1238	if (copy_from_user(tbuf, ctrl->data, wLength)) {
1239	ret = -EFAULT;
1240	goto done;
1241	}
1242	}
1243	pipe = usb_sndctrlpipe(dev, 0);
1244	usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1245	wLength, NULL, NULL);
1246	snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1247
1248	usb_unlock_device(dev);
1249	i = usbfs_start_wait_urb(urb, tmo, &actlen);
1250
1251	/* Linger a bit, prior to the next control message. */
1252	if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1253	msleep(200);
1254	usb_lock_device(dev);
1255	snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1256	}
1257	if (i < 0 && i != -EPIPE) {
1258	dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1259	"failed cmd %s rqt %u rq %u len %u ret %d\n",
1260	current->comm, ctrl->bRequestType, ctrl->bRequest,
1261	ctrl->wLength, i);
1262	}
1263	ret = (i < 0 ? i : actlen);
1264
1265	done:
1266	kfree(dr);
1267	usb_free_urb(urb);
1268	free_page((unsigned long) tbuf);
1269	usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1270	sizeof(struct usb_ctrlrequest));
1271	return ret;
1272	}
1273
1274	static int proc_control(struct usb_dev_state ps, void __user arg)
1275	{
1276	struct usbdevfs_ctrltransfer ctrl;
1277
1278	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1279	return -EFAULT;
1280	return do_proc_control(ps, &ctrl);
1281	}
1282
1283	static int do_proc_bulk(struct usb_dev_state *ps,
1284	struct usbdevfs_bulktransfer *bulk)
1285	{
1286	struct usb_device *dev = ps->dev;
1287	unsigned int tmo, len1, len2, pipe;
1288	unsigned char *tbuf;
1289	int i, ret;
1290	struct urb *urb = NULL;
1291	struct usb_host_endpoint *ep;
1292
1293	ret = findintfep(ps->dev, bulk->ep);
1294	if (ret < 0)
1295	return ret;
1296	ret = checkintf(ps, ret);
1297	if (ret)
1298	return ret;
1299
1300	len1 = bulk->len;
1301	if (len1 >= (INT_MAX - sizeof(struct urb)))
1302	return -EINVAL;
1303
1304	if (bulk->ep & USB_DIR_IN)
1305	pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1306	else
1307	pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1308	ep = usb_pipe_endpoint(dev, pipe);
1309	if (!ep \|\| !usb_endpoint_maxp(&ep->desc))
1310	return -EINVAL;
1311	ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1312	if (ret)
1313	return ret;
1314
1315	/*
1316	* len1 can be almost arbitrarily large. Don't WARN if it's
1317	* too big, just fail the request.
1318	*/
1319	ret = -ENOMEM;
1320	tbuf = kmalloc(len1, GFP_KERNEL \| __GFP_NOWARN);
1321	if (!tbuf)
1322	goto done;
1323	urb = usb_alloc_urb(0, GFP_KERNEL);
1324	if (!urb)
1325	goto done;
1326
1327	if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1328	USB_ENDPOINT_XFER_INT) {
1329	pipe = (pipe & ~(3 << 30)) \| (PIPE_INTERRUPT << 30);
1330	usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1331	NULL, NULL, ep->desc.bInterval);
1332	} else {
1333	usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1334	}
1335
1336	tmo = bulk->timeout;
1337	if (bulk->ep & 0x80) {
1338	snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1339
1340	usb_unlock_device(dev);
1341	i = usbfs_start_wait_urb(urb, tmo, &len2);
1342	usb_lock_device(dev);
1343	snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1344
1345	if (!i && len2) {
1346	if (copy_to_user(bulk->data, tbuf, len2)) {
1347	ret = -EFAULT;
1348	goto done;
1349	}
1350	}
1351	} else {
1352	if (len1) {
1353	if (copy_from_user(tbuf, bulk->data, len1)) {
1354	ret = -EFAULT;
1355	goto done;
1356	}
1357	}
1358	snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1359
1360	usb_unlock_device(dev);
1361	i = usbfs_start_wait_urb(urb, tmo, &len2);
1362	usb_lock_device(dev);
1363	snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1364	}
1365	ret = (i < 0 ? i : len2);
1366	done:
1367	usb_free_urb(urb);
1368	kfree(tbuf);
1369	usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1370	return ret;
1371	}
1372
1373	static int proc_bulk(struct usb_dev_state ps, void __user arg)
1374	{
1375	struct usbdevfs_bulktransfer bulk;
1376
1377	if (copy_from_user(&bulk, arg, sizeof(bulk)))
1378	return -EFAULT;
1379	return do_proc_bulk(ps, &bulk);
1380	}
1381
1382	static void check_reset_of_active_ep(struct usb_device *udev,
1383	unsigned int epnum, char *ioctl_name)
1384	{
1385	struct usb_host_endpoint **eps;
1386	struct usb_host_endpoint *ep;
1387
1388	eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1389	ep = eps[epnum & 0x0f];
1390	if (ep && !list_empty(&ep->urb_list))
1391	dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1392	task_pid_nr(current), current->comm,
1393	ioctl_name, epnum);
1394	}
1395
1396	static int proc_resetep(struct usb_dev_state ps, void __user arg)
1397	{
1398	unsigned int ep;
1399	int ret;
1400
1401	if (get_user(ep, (unsigned int __user *)arg))
1402	return -EFAULT;
1403	ret = findintfep(ps->dev, ep);
1404	if (ret < 0)
1405	return ret;
1406	ret = checkintf(ps, ret);
1407	if (ret)
1408	return ret;
1409	check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1410	usb_reset_endpoint(ps->dev, ep);
1411	return 0;
1412	}
1413
1414	static int proc_clearhalt(struct usb_dev_state ps, void __user arg)
1415	{
1416	unsigned int ep;
1417	int pipe;
1418	int ret;
1419
1420	if (get_user(ep, (unsigned int __user *)arg))
1421	return -EFAULT;
1422	ret = findintfep(ps->dev, ep);
1423	if (ret < 0)
1424	return ret;
1425	ret = checkintf(ps, ret);
1426	if (ret)
1427	return ret;
1428	check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1429	if (ep & USB_DIR_IN)
1430	pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1431	else
1432	pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1433
1434	return usb_clear_halt(ps->dev, pipe);
1435	}
1436
1437	static int proc_getdriver(struct usb_dev_state ps, void __user arg)
1438	{
1439	struct usbdevfs_getdriver gd;
1440	struct usb_interface *intf;
1441	int ret;
1442
1443	if (copy_from_user(&gd, arg, sizeof(gd)))
1444	return -EFAULT;
1445	intf = usb_ifnum_to_if(ps->dev, gd.interface);
1446	if (!intf \|\| !intf->dev.driver)
1447	ret = -ENODATA;
1448	else {
1449	strscpy(gd.driver, intf->dev.driver->name,
1450	sizeof(gd.driver));
1451	ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1452	}
1453	return ret;
1454	}
1455
1456	static int proc_connectinfo(struct usb_dev_state ps, void __user arg)
1457	{
1458	struct usbdevfs_connectinfo ci;
1459
1460	memset(&ci, 0, sizeof(ci));
1461	ci.devnum = ps->dev->devnum;
1462	ci.slow = ps->dev->speed == USB_SPEED_LOW;
1463
1464	if (copy_to_user(arg, &ci, sizeof(ci)))
1465	return -EFAULT;
1466	return 0;
1467	}
1468
1469	static int proc_conninfo_ex(struct usb_dev_state *ps,
1470	void __user *arg, size_t size)
1471	{
1472	struct usbdevfs_conninfo_ex ci;
1473	struct usb_device *udev = ps->dev;
1474
1475	if (size < sizeof(ci.size))
1476	return -EINVAL;
1477
1478	memset(&ci, 0, sizeof(ci));
1479	ci.size = sizeof(ci);
1480	ci.busnum = udev->bus->busnum;
1481	ci.devnum = udev->devnum;
1482	ci.speed = udev->speed;
1483
1484	while (udev && udev->portnum != 0) {
1485	if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1486	ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1487	udev->portnum;
1488	udev = udev->parent;
1489	}
1490
1491	if (ci.num_ports < ARRAY_SIZE(ci.ports))
1492	memmove(&ci.ports[0],
1493	&ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1494	ci.num_ports);
1495
1496	if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1497	return -EFAULT;
1498
1499	return 0;
1500	}
1501
1502	static int proc_resetdevice(struct usb_dev_state *ps)
1503	{
1504	struct usb_host_config *actconfig = ps->dev->actconfig;
1505	struct usb_interface *interface;
1506	int i, number;
1507
1508	/* Don't allow a device reset if the process has dropped the
1509	* privilege to do such things and any of the interfaces are
1510	* currently claimed.
1511	*/
1512	if (ps->privileges_dropped && actconfig) {
1513	for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1514	interface = actconfig->interface[i];
1515	number = interface->cur_altsetting->desc.bInterfaceNumber;
1516	if (usb_interface_claimed(interface) &&
1517	!test_bit(number, &ps->ifclaimed)) {
1518	dev_warn(&ps->dev->dev,
1519	"usbfs: interface %d claimed by %s while '%s' resets device\n",
1520	number, interface->dev.driver->name, current->comm);
1521	return -EACCES;
1522	}
1523	}
1524	}
1525
1526	return usb_reset_device(ps->dev);
1527	}
1528
1529	static int proc_setintf(struct usb_dev_state ps, void __user arg)
1530	{
1531	struct usbdevfs_setinterface setintf;
1532	int ret;
1533
1534	if (copy_from_user(&setintf, arg, sizeof(setintf)))
1535	return -EFAULT;
1536	ret = checkintf(ps, setintf.interface);
1537	if (ret)
1538	return ret;
1539
1540	destroy_async_on_interface(ps, setintf.interface);
1541
1542	return usb_set_interface(ps->dev, setintf.interface,
1543	setintf.altsetting);
1544	}
1545
1546	static int proc_setconfig(struct usb_dev_state ps, void __user arg)
1547	{
1548	int u;
1549	int status = 0;
1550	struct usb_host_config *actconfig;
1551
1552	if (get_user(u, (int __user *)arg))
1553	return -EFAULT;
1554
1555	actconfig = ps->dev->actconfig;
1556
1557	/* Don't touch the device if any interfaces are claimed.
1558	* It could interfere with other drivers' operations, and if
1559	* an interface is claimed by usbfs it could easily deadlock.
1560	*/
1561	if (actconfig) {
1562	int i;
1563
1564	for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1565	if (usb_interface_claimed(actconfig->interface[i])) {
1566	dev_warn(&ps->dev->dev,
1567	"usbfs: interface %d claimed by %s "
1568	"while '%s' sets config #%d\n",
1569	actconfig->interface[i]
1570	->cur_altsetting
1571	->desc.bInterfaceNumber,
1572	actconfig->interface[i]
1573	->dev.driver->name,
1574	current->comm, u);
1575	status = -EBUSY;
1576	break;
1577	}
1578	}
1579	}
1580
1581	/* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1582	* so avoid usb_set_configuration()'s kick to sysfs
1583	*/
1584	if (status == 0) {
1585	if (actconfig && actconfig->desc.bConfigurationValue == u)
1586	status = usb_reset_configuration(ps->dev);
1587	else
1588	status = usb_set_configuration(ps->dev, u);
1589	}
1590
1591	return status;
1592	}
1593
1594	static struct usb_memory *
1595	find_memory_area(struct usb_dev_state ps, const struct usbdevfs_urb uurb)
1596	{
1597	struct usb_memory usbm = NULL, iter;
1598	unsigned long flags;
1599	unsigned long uurb_start = (unsigned long)uurb->buffer;
1600
1601	spin_lock_irqsave(&ps->lock, flags);
1602	list_for_each_entry(iter, &ps->memory_list, memlist) {
1603	if (uurb_start >= iter->vm_start &&
1604	uurb_start < iter->vm_start + iter->size) {
1605	if (uurb->buffer_length > iter->vm_start + iter->size -
1606	uurb_start) {
1607	usbm = ERR_PTR(-EINVAL);
1608	} else {
1609	usbm = iter;
1610	usbm->urb_use_count++;
1611	}
1612	break;
1613	}
1614	}
1615	spin_unlock_irqrestore(&ps->lock, flags);
1616	return usbm;
1617	}
1618
1619	static int proc_do_submiturb(struct usb_dev_state ps, struct usbdevfs_urb uurb,
1620	struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1621	void __user *arg, sigval_t userurb_sigval)
1622	{
1623	struct usbdevfs_iso_packet_desc *isopkt = NULL;
1624	struct usb_host_endpoint *ep;
1625	struct async *as = NULL;
1626	struct usb_ctrlrequest *dr = NULL;
1627	unsigned int u, totlen, isofrmlen;
1628	int i, ret, num_sgs = 0, ifnum = -1;
1629	int number_of_packets = 0;
1630	unsigned int stream_id = 0;
1631	void *buf;
1632	bool is_in;
1633	bool allow_short = false;
1634	bool allow_zero = false;
1635	unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK \|
1636	USBDEVFS_URB_BULK_CONTINUATION \|
1637	USBDEVFS_URB_NO_FSBR \|
1638	USBDEVFS_URB_ZERO_PACKET \|
1639	USBDEVFS_URB_NO_INTERRUPT;
1640	/* USBDEVFS_URB_ISO_ASAP is a special case */
1641	if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1642	mask \|= USBDEVFS_URB_ISO_ASAP;
1643
1644	if (uurb->flags & ~mask)
1645	return -EINVAL;
1646
1647	if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1648	return -EINVAL;
1649	if (uurb->buffer_length > 0 && !uurb->buffer)
1650	return -EINVAL;
1651	if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1652	(uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1653	ifnum = findintfep(ps->dev, uurb->endpoint);
1654	if (ifnum < 0)
1655	return ifnum;
1656	ret = checkintf(ps, ifnum);
1657	if (ret)
1658	return ret;
1659	}
1660	ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1661	if (!ep)
1662	return -ENOENT;
1663	is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1664
1665	u = 0;
1666	switch (uurb->type) {
1667	case USBDEVFS_URB_TYPE_CONTROL:
1668	if (!usb_endpoint_xfer_control(&ep->desc))
1669	return -EINVAL;
1670	/* min 8 byte setup packet */
1671	if (uurb->buffer_length < 8)
1672	return -EINVAL;
1673	dr = kmalloc_obj(struct usb_ctrlrequest);
1674	if (!dr)
1675	return -ENOMEM;
1676	if (copy_from_user(dr, uurb->buffer, 8)) {
1677	ret = -EFAULT;
1678	goto error;
1679	}
1680	if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1681	ret = -EINVAL;
1682	goto error;
1683	}
1684	ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1685	le16_to_cpu(dr->wIndex));
1686	if (ret)
1687	goto error;
1688	uurb->buffer_length = le16_to_cpu(dr->wLength);
1689	uurb->buffer += 8;
1690	if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1691	is_in = true;
1692	uurb->endpoint \|= USB_DIR_IN;
1693	} else {
1694	is_in = false;
1695	uurb->endpoint &= ~USB_DIR_IN;
1696	}
1697	if (is_in)
1698	allow_short = true;
1699	snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1700	"bRequest=%02x wValue=%04x "
1701	"wIndex=%04x wLength=%04x\n",
1702	dr->bRequestType, dr->bRequest,
1703	__le16_to_cpu(dr->wValue),
1704	__le16_to_cpu(dr->wIndex),
1705	__le16_to_cpu(dr->wLength));
1706	u = sizeof(struct usb_ctrlrequest);
1707	break;
1708
1709	case USBDEVFS_URB_TYPE_BULK:
1710	if (!is_in)
1711	allow_zero = true;
1712	else
1713	allow_short = true;
1714	switch (usb_endpoint_type(&ep->desc)) {
1715	case USB_ENDPOINT_XFER_CONTROL:
1716	case USB_ENDPOINT_XFER_ISOC:
1717	return -EINVAL;
1718	case USB_ENDPOINT_XFER_INT:
1719	/* allow single-shot interrupt transfers */
1720	uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1721	goto interrupt_urb;
1722	}
1723	num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1724	if (num_sgs == 1 \|\| num_sgs > ps->dev->bus->sg_tablesize)
1725	num_sgs = 0;
1726	if (ep->streams)
1727	stream_id = uurb->stream_id;
1728	break;
1729
1730	case USBDEVFS_URB_TYPE_INTERRUPT:
1731	if (!usb_endpoint_xfer_int(&ep->desc))
1732	return -EINVAL;
1733	interrupt_urb:
1734	if (!is_in)
1735	allow_zero = true;
1736	else
1737	allow_short = true;
1738	break;
1739
1740	case USBDEVFS_URB_TYPE_ISO:
1741	/* arbitrary limit */
1742	if (uurb->number_of_packets < 1 \|\|
1743	uurb->number_of_packets > 128)
1744	return -EINVAL;
1745	if (!usb_endpoint_xfer_isoc(&ep->desc))
1746	return -EINVAL;
1747	number_of_packets = uurb->number_of_packets;
1748	isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1749	number_of_packets;
1750	isopkt = memdup_user(iso_frame_desc, isofrmlen);
1751	if (IS_ERR(isopkt)) {
1752	ret = PTR_ERR(isopkt);
1753	isopkt = NULL;
1754	goto error;
1755	}
1756	for (totlen = u = 0; u < number_of_packets; u++) {
1757	/*
1758	* arbitrary limit need for USB 3.1 Gen2
1759	* sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1760	*/
1761	if (isopkt[u].length > 98304) {
1762	ret = -EINVAL;
1763	goto error;
1764	}
1765	totlen += isopkt[u].length;
1766	}
1767	u *= sizeof(struct usb_iso_packet_descriptor);
1768	uurb->buffer_length = totlen;
1769	break;
1770
1771	default:
1772	return -EINVAL;
1773	}
1774
1775	if (uurb->buffer_length > 0 &&
1776	!access_ok(uurb->buffer, uurb->buffer_length)) {
1777	ret = -EFAULT;
1778	goto error;
1779	}
1780	as = alloc_async(number_of_packets);
1781	if (!as) {
1782	ret = -ENOMEM;
1783	goto error;
1784	}
1785
1786	as->usbm = find_memory_area(ps, uurb);
1787	if (IS_ERR(as->usbm)) {
1788	ret = PTR_ERR(as->usbm);
1789	as->usbm = NULL;
1790	goto error;
1791	}
1792
1793	/* do not use SG buffers when memory mapped segments
1794	* are in use
1795	*/
1796	if (as->usbm)
1797	num_sgs = 0;
1798
1799	u += sizeof(struct async) + sizeof(struct urb) +
1800	(as->usbm ? 0 : uurb->buffer_length) +
1801	num_sgs * sizeof(struct scatterlist);
1802	ret = usbfs_increase_memory_usage(u);
1803	if (ret)
1804	goto error;
1805	as->mem_usage = u;
1806
1807	if (num_sgs) {
1808	as->urb->sg = kmalloc_objs(struct scatterlist, num_sgs,
1809	GFP_KERNEL \| __GFP_NOWARN);
1810	if (!as->urb->sg) {
1811	ret = -ENOMEM;
1812	goto error;
1813	}
1814	as->urb->num_sgs = num_sgs;
1815	sg_init_table(as->urb->sg, as->urb->num_sgs);
1816
1817	totlen = uurb->buffer_length;
1818	for (i = 0; i < as->urb->num_sgs; i++) {
1819	u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1820	buf = kmalloc(u, GFP_KERNEL);
1821	if (!buf) {
1822	ret = -ENOMEM;
1823	goto error;
1824	}
1825	sg_set_buf(&as->urb->sg[i], buf, u);
1826
1827	if (!is_in) {
1828	if (copy_from_user(buf, uurb->buffer, u)) {
1829	ret = -EFAULT;
1830	goto error;
1831	}
1832	uurb->buffer += u;
1833	}
1834	totlen -= u;
1835	}
1836	} else if (uurb->buffer_length > 0) {
1837	if (as->usbm) {
1838	unsigned long uurb_start = (unsigned long)uurb->buffer;
1839
1840	as->urb->transfer_buffer = as->usbm->mem +
1841	(uurb_start - as->usbm->vm_start);
1842	} else {
1843	as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1844	GFP_KERNEL \| __GFP_NOWARN);
1845	if (!as->urb->transfer_buffer) {
1846	ret = -ENOMEM;
1847	goto error;
1848	}
1849	if (!is_in) {
1850	if (copy_from_user(as->urb->transfer_buffer,
1851	uurb->buffer,
1852	uurb->buffer_length)) {
1853	ret = -EFAULT;
1854	goto error;
1855	}
1856	} else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1857	/*
1858	* Isochronous input data may end up being
1859	* discontiguous if some of the packets are
1860	* short. Clear the buffer so that the gaps
1861	* don't leak kernel data to userspace.
1862	*/
1863	memset(as->urb->transfer_buffer, 0,
1864	uurb->buffer_length);
1865	}
1866	}
1867	}
1868	as->urb->dev = ps->dev;
1869	as->urb->pipe = (uurb->type << 30) \|
1870	__create_pipe(ps->dev, uurb->endpoint & 0xf) \|
1871	(uurb->endpoint & USB_DIR_IN);
1872
1873	/* This tedious sequence is necessary because the URB_* flags
1874	* are internal to the kernel and subject to change, whereas
1875	* the USBDEVFS_URB_* flags are a user API and must not be changed.
1876	*/
1877	u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1878	if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1879	u \|= URB_ISO_ASAP;
1880	if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1881	u \|= URB_SHORT_NOT_OK;
1882	if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1883	u \|= URB_ZERO_PACKET;
1884	if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1885	u \|= URB_NO_INTERRUPT;
1886	as->urb->transfer_flags = u;
1887
1888	if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1889	dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1890	if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1891	dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1892
1893	as->urb->transfer_buffer_length = uurb->buffer_length;
1894	as->urb->setup_packet = (unsigned char *)dr;
1895	dr = NULL;
1896	as->urb->start_frame = uurb->start_frame;
1897	as->urb->number_of_packets = number_of_packets;
1898	as->urb->stream_id = stream_id;
1899
1900	if (ep->desc.bInterval) {
1901	if (uurb->type == USBDEVFS_URB_TYPE_ISO \|\|
1902	ps->dev->speed == USB_SPEED_HIGH \|\|
1903	ps->dev->speed >= USB_SPEED_SUPER)
1904	as->urb->interval = 1 <<
1905	min(15, ep->desc.bInterval - 1);
1906	else
1907	as->urb->interval = ep->desc.bInterval;
1908	}
1909
1910	as->urb->context = as;
1911	as->urb->complete = async_completed;
1912	for (totlen = u = 0; u < number_of_packets; u++) {
1913	as->urb->iso_frame_desc[u].offset = totlen;
1914	as->urb->iso_frame_desc[u].length = isopkt[u].length;
1915	totlen += isopkt[u].length;
1916	}
1917	kfree(isopkt);
1918	isopkt = NULL;
1919	as->ps = ps;
1920	as->userurb = arg;
1921	as->userurb_sigval = userurb_sigval;
1922	if (as->usbm) {
1923	unsigned long uurb_start = (unsigned long)uurb->buffer;
1924
1925	as->urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
1926	as->urb->transfer_dma = as->usbm->dma_handle +
1927	(uurb_start - as->usbm->vm_start);
1928	} else if (is_in && uurb->buffer_length > 0)
1929	as->userbuffer = uurb->buffer;
1930	as->signr = uurb->signr;
1931	as->ifnum = ifnum;
1932	as->pid = get_pid(task_pid(current));
1933	as->cred = get_current_cred();
1934	snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1935	as->urb->transfer_buffer_length, 0, SUBMIT,
1936	NULL, 0);
1937	if (!is_in)
1938	snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1939
1940	async_newpending(as);
1941
1942	if (usb_endpoint_xfer_bulk(&ep->desc)) {
1943	spin_lock_irq(&ps->lock);
1944
1945	/* Not exactly the endpoint address; the direction bit is
1946	* shifted to the 0x10 position so that the value will be
1947	* between 0 and 31.
1948	*/
1949	as->bulk_addr = usb_endpoint_num(&ep->desc) \|
1950	((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1951	>> 3);
1952
1953	/* If this bulk URB is the start of a new transfer, re-enable
1954	* the endpoint. Otherwise mark it as a continuation URB.
1955	*/
1956	if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1957	as->bulk_status = AS_CONTINUATION;
1958	else
1959	ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1960
1961	/* Don't accept continuation URBs if the endpoint is
1962	* disabled because of an earlier error.
1963	*/
1964	if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1965	ret = -EREMOTEIO;
1966	else
1967	ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1968	spin_unlock_irq(&ps->lock);
1969	} else {
1970	ret = usb_submit_urb(as->urb, GFP_KERNEL);
1971	}
1972
1973	if (ret) {
1974	dev_printk(KERN_DEBUG, &ps->dev->dev,
1975	"usbfs: usb_submit_urb returned %d\n", ret);
1976	snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1977	0, ret, COMPLETE, NULL, 0);
1978	async_removepending(as);
1979	goto error;
1980	}
1981	return 0;
1982
1983	error:
1984	kfree(isopkt);
1985	kfree(dr);
1986	if (as)
1987	free_async(as);
1988	return ret;
1989	}
1990
1991	static int proc_submiturb(struct usb_dev_state ps, void __user arg)
1992	{
1993	struct usbdevfs_urb uurb;
1994	sigval_t userurb_sigval;
1995
1996	if (copy_from_user(&uurb, arg, sizeof(uurb)))
1997	return -EFAULT;
1998
1999	memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2000	userurb_sigval.sival_ptr = arg;
2001
2002	return proc_do_submiturb(ps, &uurb,
2003	(((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
2004	arg, userurb_sigval);
2005	}
2006
2007	static int proc_unlinkurb(struct usb_dev_state ps, void __user arg)
2008	{
2009	struct urb *urb;
2010	struct async *as;
2011	unsigned long flags;
2012
2013	spin_lock_irqsave(&ps->lock, flags);
2014	as = async_getpending(ps, arg);
2015	if (!as) {
2016	spin_unlock_irqrestore(&ps->lock, flags);
2017	return -EINVAL;
2018	}
2019
2020	urb = as->urb;
2021	usb_get_urb(urb);
2022	spin_unlock_irqrestore(&ps->lock, flags);
2023
2024	usb_kill_urb(urb);
2025	usb_put_urb(urb);
2026
2027	return 0;
2028	}
2029
2030	static void compute_isochronous_actual_length(struct urb *urb)
2031	{
2032	unsigned int i;
2033
2034	if (urb->number_of_packets > 0) {
2035	urb->actual_length = 0;
2036	for (i = 0; i < urb->number_of_packets; i++)
2037	urb->actual_length +=
2038	urb->iso_frame_desc[i].actual_length;
2039	}
2040	}
2041
2042	static int processcompl(struct async as, void __user __user *arg)
2043	{
2044	struct urb *urb = as->urb;
2045	struct usbdevfs_urb __user *userurb = as->userurb;
2046	void __user *addr = as->userurb;
2047	unsigned int i;
2048
2049	compute_isochronous_actual_length(urb);
2050	if (as->userbuffer && urb->actual_length) {
2051	if (copy_urb_data_to_user(as->userbuffer, urb))
2052	goto err_out;
2053	}
2054	if (put_user(as->status, &userurb->status))
2055	goto err_out;
2056	if (put_user(urb->actual_length, &userurb->actual_length))
2057	goto err_out;
2058	if (put_user(urb->error_count, &userurb->error_count))
2059	goto err_out;
2060
2061	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2062	for (i = 0; i < urb->number_of_packets; i++) {
2063	if (put_user(urb->iso_frame_desc[i].actual_length,
2064	&userurb->iso_frame_desc[i].actual_length))
2065	goto err_out;
2066	if (put_user(urb->iso_frame_desc[i].status,
2067	&userurb->iso_frame_desc[i].status))
2068	goto err_out;
2069	}
2070	}
2071
2072	if (put_user(addr, (void __user * __user *)arg))
2073	return -EFAULT;
2074	return 0;
2075
2076	err_out:
2077	return -EFAULT;
2078	}
2079
2080	static struct async reap_as(struct usb_dev_state ps)
2081	{
2082	DECLARE_WAITQUEUE(wait, current);
2083	struct async *as = NULL;
2084	struct usb_device *dev = ps->dev;
2085
2086	add_wait_queue(&ps->wait, &wait);
2087	for (;;) {
2088	__set_current_state(TASK_INTERRUPTIBLE);
2089	as = async_getcompleted(ps);
2090	if (as \|\| !connected(ps))
2091	break;
2092	if (signal_pending(current))
2093	break;
2094	usb_unlock_device(dev);
2095	schedule();
2096	usb_lock_device(dev);
2097	}
2098	remove_wait_queue(&ps->wait, &wait);
2099	set_current_state(TASK_RUNNING);
2100	return as;
2101	}
2102
2103	static int proc_reapurb(struct usb_dev_state ps, void __user arg)
2104	{
2105	struct async *as = reap_as(ps);
2106
2107	if (as) {
2108	int retval;
2109
2110	snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2111	retval = processcompl(as, (void __user * __user *)arg);
2112	free_async(as);
2113	return retval;
2114	}
2115	if (signal_pending(current))
2116	return -EINTR;
2117	return -ENODEV;
2118	}
2119
2120	static int proc_reapurbnonblock(struct usb_dev_state ps, void __user arg)
2121	{
2122	int retval;
2123	struct async *as;
2124
2125	as = async_getcompleted(ps);
2126	if (as) {
2127	snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2128	retval = processcompl(as, (void __user * __user *)arg);
2129	free_async(as);
2130	} else {
2131	retval = (connected(ps) ? -EAGAIN : -ENODEV);
2132	}
2133	return retval;
2134	}
2135
2136	#ifdef CONFIG_COMPAT
2137	static int proc_control_compat(struct usb_dev_state *ps,
2138	struct usbdevfs_ctrltransfer32 __user *p32)
2139	{
2140	struct usbdevfs_ctrltransfer ctrl;
2141	u32 udata;
2142
2143	if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) \|\|
2144	get_user(udata, &p32->data))
2145	return -EFAULT;
2146	ctrl.data = compat_ptr(udata);
2147	return do_proc_control(ps, &ctrl);
2148	}
2149
2150	static int proc_bulk_compat(struct usb_dev_state *ps,
2151	struct usbdevfs_bulktransfer32 __user *p32)
2152	{
2153	struct usbdevfs_bulktransfer bulk;
2154	compat_caddr_t addr;
2155
2156	if (get_user(bulk.ep, &p32->ep) \|\|
2157	get_user(bulk.len, &p32->len) \|\|
2158	get_user(bulk.timeout, &p32->timeout) \|\|
2159	get_user(addr, &p32->data))
2160	return -EFAULT;
2161	bulk.data = compat_ptr(addr);
2162	return do_proc_bulk(ps, &bulk);
2163	}
2164
2165	static int proc_disconnectsignal_compat(struct usb_dev_state ps, void __user arg)
2166	{
2167	struct usbdevfs_disconnectsignal32 ds;
2168
2169	if (copy_from_user(&ds, arg, sizeof(ds)))
2170	return -EFAULT;
2171	ps->discsignr = ds.signr;
2172	ps->disccontext.sival_int = ds.context;
2173	return 0;
2174	}
2175
2176	static int get_urb32(struct usbdevfs_urb *kurb,
2177	struct usbdevfs_urb32 __user *uurb)
2178	{
2179	struct usbdevfs_urb32 urb32;
2180	if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2181	return -EFAULT;
2182	kurb->type = urb32.type;
2183	kurb->endpoint = urb32.endpoint;
2184	kurb->status = urb32.status;
2185	kurb->flags = urb32.flags;
2186	kurb->buffer = compat_ptr(urb32.buffer);
2187	kurb->buffer_length = urb32.buffer_length;
2188	kurb->actual_length = urb32.actual_length;
2189	kurb->start_frame = urb32.start_frame;
2190	kurb->number_of_packets = urb32.number_of_packets;
2191	kurb->error_count = urb32.error_count;
2192	kurb->signr = urb32.signr;
2193	kurb->usercontext = compat_ptr(urb32.usercontext);
2194	return 0;
2195	}
2196
2197	static int proc_submiturb_compat(struct usb_dev_state ps, void __user arg)
2198	{
2199	struct usbdevfs_urb uurb;
2200	sigval_t userurb_sigval;
2201
2202	if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2203	return -EFAULT;
2204
2205	memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2206	userurb_sigval.sival_int = ptr_to_compat(arg);
2207
2208	return proc_do_submiturb(ps, &uurb,
2209	((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2210	arg, userurb_sigval);
2211	}
2212
2213	static int processcompl_compat(struct async as, void __user __user *arg)
2214	{
2215	struct urb *urb = as->urb;
2216	struct usbdevfs_urb32 __user *userurb = as->userurb;
2217	void __user *addr = as->userurb;
2218	unsigned int i;
2219
2220	compute_isochronous_actual_length(urb);
2221	if (as->userbuffer && urb->actual_length) {
2222	if (copy_urb_data_to_user(as->userbuffer, urb))
2223	return -EFAULT;
2224	}
2225	if (put_user(as->status, &userurb->status))
2226	return -EFAULT;
2227	if (put_user(urb->actual_length, &userurb->actual_length))
2228	return -EFAULT;
2229	if (put_user(urb->error_count, &userurb->error_count))
2230	return -EFAULT;
2231
2232	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2233	for (i = 0; i < urb->number_of_packets; i++) {
2234	if (put_user(urb->iso_frame_desc[i].actual_length,
2235	&userurb->iso_frame_desc[i].actual_length))
2236	return -EFAULT;
2237	if (put_user(urb->iso_frame_desc[i].status,
2238	&userurb->iso_frame_desc[i].status))
2239	return -EFAULT;
2240	}
2241	}
2242
2243	if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2244	return -EFAULT;
2245	return 0;
2246	}
2247
2248	static int proc_reapurb_compat(struct usb_dev_state ps, void __user arg)
2249	{
2250	struct async *as = reap_as(ps);
2251
2252	if (as) {
2253	int retval;
2254
2255	snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2256	retval = processcompl_compat(as, (void __user * __user *)arg);
2257	free_async(as);
2258	return retval;
2259	}
2260	if (signal_pending(current))
2261	return -EINTR;
2262	return -ENODEV;
2263	}
2264
2265	static int proc_reapurbnonblock_compat(struct usb_dev_state ps, void __user arg)
2266	{
2267	int retval;
2268	struct async *as;
2269
2270	as = async_getcompleted(ps);
2271	if (as) {
2272	snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2273	retval = processcompl_compat(as, (void __user * __user *)arg);
2274	free_async(as);
2275	} else {
2276	retval = (connected(ps) ? -EAGAIN : -ENODEV);
2277	}
2278	return retval;
2279	}
2280
2281
2282	#endif
2283
2284	static int proc_disconnectsignal(struct usb_dev_state ps, void __user arg)
2285	{
2286	struct usbdevfs_disconnectsignal ds;
2287
2288	if (copy_from_user(&ds, arg, sizeof(ds)))
2289	return -EFAULT;
2290	ps->discsignr = ds.signr;
2291	ps->disccontext.sival_ptr = ds.context;
2292	return 0;
2293	}
2294
2295	static int proc_claiminterface(struct usb_dev_state ps, void __user arg)
2296	{
2297	unsigned int ifnum;
2298
2299	if (get_user(ifnum, (unsigned int __user *)arg))
2300	return -EFAULT;
2301	return claimintf(ps, ifnum);
2302	}
2303
2304	static int proc_releaseinterface(struct usb_dev_state ps, void __user arg)
2305	{
2306	unsigned int ifnum;
2307	int ret;
2308
2309	if (get_user(ifnum, (unsigned int __user *)arg))
2310	return -EFAULT;
2311	ret = releaseintf(ps, ifnum);
2312	if (ret < 0)
2313	return ret;
2314	destroy_async_on_interface(ps, ifnum);
2315	return 0;
2316	}
2317
2318	static int proc_ioctl(struct usb_dev_state ps, struct usbdevfs_ioctl ctl)
2319	{
2320	int size;
2321	void *buf = NULL;
2322	int retval = 0;
2323	struct usb_interface *intf = NULL;
2324	struct usb_driver *driver = NULL;
2325
2326	if (ps->privileges_dropped)
2327	return -EACCES;
2328
2329	if (!connected(ps))
2330	return -ENODEV;
2331
2332	if (ps->dev->state != USB_STATE_CONFIGURED)
2333	return -EHOSTUNREACH;
2334
2335	intf = usb_ifnum_to_if(ps->dev, ctl->ifno);
2336	if (!intf)
2337	return -EINVAL;
2338
2339	/* alloc buffer */
2340	size = _IOC_SIZE(ctl->ioctl_code);
2341	if (size > 0) {
2342	buf = kmalloc(size, GFP_KERNEL);
2343	if (buf == NULL)
2344	return -ENOMEM;
2345	if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2346	if (copy_from_user(buf, ctl->data, size)) {
2347	kfree(buf);
2348	return -EFAULT;
2349	}
2350	} else {
2351	memset(buf, 0, size);
2352	}
2353	}
2354
2355	switch (ctl->ioctl_code) {
2356
2357	/* disconnect kernel driver from interface */
2358	case USBDEVFS_DISCONNECT:
2359	if (intf->dev.driver) {
2360	driver = to_usb_driver(intf->dev.driver);
2361	dev_dbg(&intf->dev, "disconnect by usbfs\n");
2362	usb_driver_release_interface(driver, intf);
2363	} else
2364	retval = -ENODATA;
2365	break;
2366
2367	/* let kernel drivers try to (re)bind to the interface */
2368	case USBDEVFS_CONNECT:
2369	if (!intf->dev.driver)
2370	retval = device_attach(&intf->dev);
2371	else
2372	retval = -EBUSY;
2373	break;
2374
2375	/* talk directly to the interface's driver */
2376	default:
2377	if (intf->dev.driver)
2378	driver = to_usb_driver(intf->dev.driver);
2379	if (driver == NULL \|\| driver->unlocked_ioctl == NULL) {
2380	retval = -ENOTTY;
2381	} else {
2382	retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2383	if (retval == -ENOIOCTLCMD)
2384	retval = -ENOTTY;
2385	}
2386	}
2387
2388	/* cleanup and return */
2389	if (retval >= 0
2390	&& (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2391	&& size > 0
2392	&& copy_to_user(ctl->data, buf, size) != 0)
2393	retval = -EFAULT;
2394
2395	kfree(buf);
2396	return retval;
2397	}
2398
2399	static int proc_ioctl_default(struct usb_dev_state ps, void __user arg)
2400	{
2401	struct usbdevfs_ioctl ctrl;
2402
2403	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2404	return -EFAULT;
2405	return proc_ioctl(ps, &ctrl);
2406	}
2407
2408	#ifdef CONFIG_COMPAT
2409	static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2410	{
2411	struct usbdevfs_ioctl32 ioc32;
2412	struct usbdevfs_ioctl ctrl;
2413
2414	if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2415	return -EFAULT;
2416	ctrl.ifno = ioc32.ifno;
2417	ctrl.ioctl_code = ioc32.ioctl_code;
2418	ctrl.data = compat_ptr(ioc32.data);
2419	return proc_ioctl(ps, &ctrl);
2420	}
2421	#endif
2422
2423	static int proc_claim_port(struct usb_dev_state ps, void __user arg)
2424	{
2425	unsigned portnum;
2426	int rc;
2427
2428	if (get_user(portnum, (unsigned __user *) arg))
2429	return -EFAULT;
2430	rc = usb_hub_claim_port(ps->dev, portnum, ps);
2431	if (rc == 0)
2432	snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2433	portnum, task_pid_nr(current), current->comm);
2434	return rc;
2435	}
2436
2437	static int proc_release_port(struct usb_dev_state ps, void __user arg)
2438	{
2439	unsigned portnum;
2440
2441	if (get_user(portnum, (unsigned __user *) arg))
2442	return -EFAULT;
2443	return usb_hub_release_port(ps->dev, portnum, ps);
2444	}
2445
2446	static int proc_get_capabilities(struct usb_dev_state ps, void __user arg)
2447	{
2448	__u32 caps;
2449
2450	caps = USBDEVFS_CAP_ZERO_PACKET \| USBDEVFS_CAP_NO_PACKET_SIZE_LIM \|
2451	USBDEVFS_CAP_REAP_AFTER_DISCONNECT \| USBDEVFS_CAP_MMAP \|
2452	USBDEVFS_CAP_DROP_PRIVILEGES \|
2453	USBDEVFS_CAP_CONNINFO_EX \| MAYBE_CAP_SUSPEND;
2454	if (!ps->dev->bus->no_stop_on_short)
2455	caps \|= USBDEVFS_CAP_BULK_CONTINUATION;
2456	if (ps->dev->bus->sg_tablesize)
2457	caps \|= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2458
2459	if (put_user(caps, (__u32 __user *)arg))
2460	return -EFAULT;
2461
2462	return 0;
2463	}
2464
2465	static int proc_disconnect_claim(struct usb_dev_state ps, void __user arg)
2466	{
2467	struct usbdevfs_disconnect_claim dc;
2468	struct usb_interface *intf;
2469
2470	if (copy_from_user(&dc, arg, sizeof(dc)))
2471	return -EFAULT;
2472
2473	intf = usb_ifnum_to_if(ps->dev, dc.interface);
2474	if (!intf)
2475	return -EINVAL;
2476
2477	if (intf->dev.driver) {
2478	struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2479
2480	if (ps->privileges_dropped)
2481	return -EACCES;
2482
2483	if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2484	strncmp(dc.driver, intf->dev.driver->name,
2485	sizeof(dc.driver)) != 0)
2486	return -EBUSY;
2487
2488	if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2489	strncmp(dc.driver, intf->dev.driver->name,
2490	sizeof(dc.driver)) == 0)
2491	return -EBUSY;
2492
2493	dev_dbg(&intf->dev, "disconnect by usbfs\n");
2494	usb_driver_release_interface(driver, intf);
2495	}
2496
2497	return claimintf(ps, dc.interface);
2498	}
2499
2500	static int proc_alloc_streams(struct usb_dev_state ps, void __user arg)
2501	{
2502	unsigned num_streams, num_eps;
2503	struct usb_host_endpoint **eps;
2504	struct usb_interface *intf;
2505	int r;
2506
2507	r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2508	&eps, &intf);
2509	if (r)
2510	return r;
2511
2512	destroy_async_on_interface(ps,
2513	intf->altsetting[0].desc.bInterfaceNumber);
2514
2515	r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2516	kfree(eps);
2517	return r;
2518	}
2519
2520	static int proc_free_streams(struct usb_dev_state ps, void __user arg)
2521	{
2522	unsigned num_eps;
2523	struct usb_host_endpoint **eps;
2524	struct usb_interface *intf;
2525	int r;
2526
2527	r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2528	if (r)
2529	return r;
2530
2531	destroy_async_on_interface(ps,
2532	intf->altsetting[0].desc.bInterfaceNumber);
2533
2534	r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2535	kfree(eps);
2536	return r;
2537	}
2538
2539	static int proc_drop_privileges(struct usb_dev_state ps, void __user arg)
2540	{
2541	u32 data;
2542
2543	if (copy_from_user(&data, arg, sizeof(data)))
2544	return -EFAULT;
2545
2546	/* This is a one way operation. Once privileges are
2547	* dropped, you cannot regain them. You may however reissue
2548	* this ioctl to shrink the allowed interfaces mask.
2549	*/
2550	ps->interface_allowed_mask &= data;
2551	ps->privileges_dropped = true;
2552
2553	return 0;
2554	}
2555
2556	static int proc_forbid_suspend(struct usb_dev_state *ps)
2557	{
2558	int ret = 0;
2559
2560	if (ps->suspend_allowed) {
2561	ret = usb_autoresume_device(ps->dev);
2562	if (ret == 0)
2563	ps->suspend_allowed = false;
2564	else if (ret != -ENODEV)
2565	ret = -EIO;
2566	}
2567	return ret;
2568	}
2569
2570	static int proc_allow_suspend(struct usb_dev_state *ps)
2571	{
2572	if (!connected(ps))
2573	return -ENODEV;
2574
2575	WRITE_ONCE(ps->not_yet_resumed, 1);
2576	if (!ps->suspend_allowed) {
2577	usb_autosuspend_device(ps->dev);
2578	ps->suspend_allowed = true;
2579	}
2580	return 0;
2581	}
2582
2583	static int proc_wait_for_resume(struct usb_dev_state *ps)
2584	{
2585	int ret;
2586
2587	usb_unlock_device(ps->dev);
2588	ret = wait_event_interruptible(ps->wait_for_resume,
2589	READ_ONCE(ps->not_yet_resumed) == 0);
2590	usb_lock_device(ps->dev);
2591
2592	if (ret != 0)
2593	return -EINTR;
2594	return proc_forbid_suspend(ps);
2595	}
2596
2597	/*
2598	* NOTE: All requests here that have interface numbers as parameters
2599	* are assuming that somehow the configuration has been prevented from
2600	* changing. But there's no mechanism to ensure that...
2601	*/
2602	static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2603	void __user *p)
2604	{
2605	struct usb_dev_state *ps = file->private_data;
2606	struct inode *inode = file_inode(file);
2607	struct usb_device *dev = ps->dev;
2608	int ret = -ENOTTY;
2609
2610	if (!(file->f_mode & FMODE_WRITE))
2611	return -EPERM;
2612
2613	usb_lock_device(dev);
2614
2615	/* Reap operations are allowed even after disconnection */
2616	switch (cmd) {
2617	case USBDEVFS_REAPURB:
2618	snoop(&dev->dev, "%s: REAPURB\n", __func__);
2619	ret = proc_reapurb(ps, p);
2620	goto done;
2621
2622	case USBDEVFS_REAPURBNDELAY:
2623	snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2624	ret = proc_reapurbnonblock(ps, p);
2625	goto done;
2626
2627	#ifdef CONFIG_COMPAT
2628	case USBDEVFS_REAPURB32:
2629	snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2630	ret = proc_reapurb_compat(ps, p);
2631	goto done;
2632
2633	case USBDEVFS_REAPURBNDELAY32:
2634	snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2635	ret = proc_reapurbnonblock_compat(ps, p);
2636	goto done;
2637	#endif
2638	}
2639
2640	if (!connected(ps)) {
2641	usb_unlock_device(dev);
2642	return -ENODEV;
2643	}
2644
2645	switch (cmd) {
2646	case USBDEVFS_CONTROL:
2647	snoop(&dev->dev, "%s: CONTROL\n", __func__);
2648	ret = proc_control(ps, p);
2649	if (ret >= 0)
2650	inode_set_mtime_to_ts(inode,
2651	inode_set_ctime_current(inode));
2652	break;
2653
2654	case USBDEVFS_BULK:
2655	snoop(&dev->dev, "%s: BULK\n", __func__);
2656	ret = proc_bulk(ps, p);
2657	if (ret >= 0)
2658	inode_set_mtime_to_ts(inode,
2659	inode_set_ctime_current(inode));
2660	break;
2661
2662	case USBDEVFS_RESETEP:
2663	snoop(&dev->dev, "%s: RESETEP\n", __func__);
2664	ret = proc_resetep(ps, p);
2665	if (ret >= 0)
2666	inode_set_mtime_to_ts(inode,
2667	inode_set_ctime_current(inode));
2668	break;
2669
2670	case USBDEVFS_RESET:
2671	snoop(&dev->dev, "%s: RESET\n", __func__);
2672	ret = proc_resetdevice(ps);
2673	break;
2674
2675	case USBDEVFS_CLEAR_HALT:
2676	snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2677	ret = proc_clearhalt(ps, p);
2678	if (ret >= 0)
2679	inode_set_mtime_to_ts(inode,
2680	inode_set_ctime_current(inode));
2681	break;
2682
2683	case USBDEVFS_GETDRIVER:
2684	snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2685	ret = proc_getdriver(ps, p);
2686	break;
2687
2688	case USBDEVFS_CONNECTINFO:
2689	snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2690	ret = proc_connectinfo(ps, p);
2691	break;
2692
2693	case USBDEVFS_SETINTERFACE:
2694	snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2695	ret = proc_setintf(ps, p);
2696	break;
2697
2698	case USBDEVFS_SETCONFIGURATION:
2699	snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2700	ret = proc_setconfig(ps, p);
2701	break;
2702
2703	case USBDEVFS_SUBMITURB:
2704	snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2705	ret = proc_submiturb(ps, p);
2706	if (ret >= 0)
2707	inode_set_mtime_to_ts(inode,
2708	inode_set_ctime_current(inode));
2709	break;
2710
2711	#ifdef CONFIG_COMPAT
2712	case USBDEVFS_CONTROL32:
2713	snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2714	ret = proc_control_compat(ps, p);
2715	if (ret >= 0)
2716	inode_set_mtime_to_ts(inode,
2717	inode_set_ctime_current(inode));
2718	break;
2719
2720	case USBDEVFS_BULK32:
2721	snoop(&dev->dev, "%s: BULK32\n", __func__);
2722	ret = proc_bulk_compat(ps, p);
2723	if (ret >= 0)
2724	inode_set_mtime_to_ts(inode,
2725	inode_set_ctime_current(inode));
2726	break;
2727
2728	case USBDEVFS_DISCSIGNAL32:
2729	snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2730	ret = proc_disconnectsignal_compat(ps, p);
2731	break;
2732
2733	case USBDEVFS_SUBMITURB32:
2734	snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2735	ret = proc_submiturb_compat(ps, p);
2736	if (ret >= 0)
2737	inode_set_mtime_to_ts(inode,
2738	inode_set_ctime_current(inode));
2739	break;
2740
2741	case USBDEVFS_IOCTL32:
2742	snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2743	ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2744	break;
2745	#endif
2746
2747	case USBDEVFS_DISCARDURB:
2748	snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2749	ret = proc_unlinkurb(ps, p);
2750	break;
2751
2752	case USBDEVFS_DISCSIGNAL:
2753	snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2754	ret = proc_disconnectsignal(ps, p);
2755	break;
2756
2757	case USBDEVFS_CLAIMINTERFACE:
2758	snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2759	ret = proc_claiminterface(ps, p);
2760	break;
2761
2762	case USBDEVFS_RELEASEINTERFACE:
2763	snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2764	ret = proc_releaseinterface(ps, p);
2765	break;
2766
2767	case USBDEVFS_IOCTL:
2768	snoop(&dev->dev, "%s: IOCTL\n", __func__);
2769	ret = proc_ioctl_default(ps, p);
2770	break;
2771
2772	case USBDEVFS_CLAIM_PORT:
2773	snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2774	ret = proc_claim_port(ps, p);
2775	break;
2776
2777	case USBDEVFS_RELEASE_PORT:
2778	snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2779	ret = proc_release_port(ps, p);
2780	break;
2781	case USBDEVFS_GET_CAPABILITIES:
2782	ret = proc_get_capabilities(ps, p);
2783	break;
2784	case USBDEVFS_DISCONNECT_CLAIM:
2785	ret = proc_disconnect_claim(ps, p);
2786	break;
2787	case USBDEVFS_ALLOC_STREAMS:
2788	ret = proc_alloc_streams(ps, p);
2789	break;
2790	case USBDEVFS_FREE_STREAMS:
2791	ret = proc_free_streams(ps, p);
2792	break;
2793	case USBDEVFS_DROP_PRIVILEGES:
2794	ret = proc_drop_privileges(ps, p);
2795	break;
2796	case USBDEVFS_GET_SPEED:
2797	ret = ps->dev->speed;
2798	break;
2799	case USBDEVFS_FORBID_SUSPEND:
2800	ret = proc_forbid_suspend(ps);
2801	break;
2802	case USBDEVFS_ALLOW_SUSPEND:
2803	ret = proc_allow_suspend(ps);
2804	break;
2805	case USBDEVFS_WAIT_FOR_RESUME:
2806	ret = proc_wait_for_resume(ps);
2807	break;
2808	}
2809
2810	/* Handle variable-length commands */
2811	switch (cmd & ~IOCSIZE_MASK) {
2812	case USBDEVFS_CONNINFO_EX(0):
2813	ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2814	break;
2815	}
2816
2817	done:
2818	usb_unlock_device(dev);
2819	if (ret >= 0)
2820	inode_set_atime_to_ts(inode, current_time(inode));
2821	return ret;
2822	}
2823
2824	static long usbdev_ioctl(struct file *file, unsigned int cmd,
2825	unsigned long arg)
2826	{
2827	int ret;
2828
2829	ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2830
2831	return ret;
2832	}
2833
2834	/* No kernel lock - fine */
2835	static __poll_t usbdev_poll(struct file *file,
2836	struct poll_table_struct *wait)
2837	{
2838	struct usb_dev_state *ps = file->private_data;
2839	__poll_t mask = 0;
2840
2841	poll_wait(file, &ps->wait, wait);
2842	if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2843	mask \|= EPOLLOUT \| EPOLLWRNORM;
2844	if (!connected(ps))
2845	mask \|= EPOLLHUP;
2846	if (list_empty(&ps->list))
2847	mask \|= EPOLLERR;
2848	return mask;
2849	}
2850
2851	const struct file_operations usbdev_file_operations = {
2852	.owner = THIS_MODULE,
2853	.llseek = no_seek_end_llseek,
2854	.read = usbdev_read,
2855	.poll = usbdev_poll,
2856	.unlocked_ioctl = usbdev_ioctl,
2857	.compat_ioctl = compat_ptr_ioctl,
2858	.mmap = usbdev_mmap,
2859	.open = usbdev_open,
2860	.release = usbdev_release,
2861	};
2862
2863	static void usbdev_remove(struct usb_device *udev)
2864	{
2865	struct usb_dev_state *ps;
2866
2867	/* Protect against simultaneous resume */
2868	mutex_lock(&usbfs_mutex);
2869	while (!list_empty(&udev->filelist)) {
2870	ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2871	destroy_all_async(ps);
2872	wake_up_all(&ps->wait);
2873	WRITE_ONCE(ps->not_yet_resumed, 0);
2874	wake_up_all(&ps->wait_for_resume);
2875	list_del_init(&ps->list);
2876	if (ps->discsignr)
2877	kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2878	ps->disc_pid, ps->cred);
2879	}
2880	mutex_unlock(&usbfs_mutex);
2881	}
2882
2883	static int usbdev_notify(struct notifier_block *self,
2884	unsigned long action, void *dev)
2885	{
2886	switch (action) {
2887	case USB_DEVICE_ADD:
2888	break;
2889	case USB_DEVICE_REMOVE:
2890	usbdev_remove(dev);
2891	break;
2892	}
2893	return NOTIFY_OK;
2894	}
2895
2896	static struct notifier_block usbdev_nb = {
2897	.notifier_call = usbdev_notify,
2898	};
2899
2900	static struct cdev usb_device_cdev;
2901
2902	int __init usb_devio_init(void)
2903	{
2904	int retval;
2905
2906	retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2907	"usb_device");
2908	if (retval) {
2909	printk(KERN_ERR "Unable to register minors for usb_device\n");
2910	goto out;
2911	}
2912	cdev_init(&usb_device_cdev, &usbdev_file_operations);
2913	retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2914	if (retval) {
2915	printk(KERN_ERR "Unable to get usb_device major %d\n",
2916	USB_DEVICE_MAJOR);
2917	goto error_cdev;
2918	}
2919	usb_register_notify(&usbdev_nb);
2920	out:
2921	return retval;
2922
2923	error_cdev:
2924	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2925	goto out;
2926	}
2927
2928	void usb_devio_cleanup(void)
2929	{
2930	usb_unregister_notify(&usbdev_nb);
2931	cdev_del(&usb_device_cdev);
2932	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2933	}