Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2920 insertions, 0 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
new file mode 100644
index 0000000000..4f68f6ef3c
--- /dev/null
+++ b/drivers/usb/core/devio.c
@@ -0,0 +1,2920 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*****************************************************************************/
+
+/*
+ *      devio.c  --  User space communication with USB devices.
+ *
+ *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *  This file implements the usbfs/x/y files, where
+ *  x is the bus number and y the device number.
+ *
+ *  It allows user space programs/"drivers" to communicate directly
+ *  with USB devices without intervening kernel driver.
+ *
+ *  Revision history
+ *    22.12.1999   0.1   Initial release (split from proc_usb.c)
+ *    04.01.2000   0.2   Turned into its own filesystem
+ *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
+ *    			 (CAN-2005-3055)
+ */
+
+/*****************************************************************************/
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+#include <linux/signal.h>
+#include <linux/poll.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/usb.h>
+#include <linux/usbdevice_fs.h>
+#include <linux/usb/hcd.h>	/* for usbcore internals */
+#include <linux/usb/quirks.h>
+#include <linux/cdev.h>
+#include <linux/notifier.h>
+#include <linux/security.h>
+#include <linux/user_namespace.h>
+#include <linux/scatterlist.h>
+#include <linux/uaccess.h>
+#include <linux/dma-mapping.h>
+#include <asm/byteorder.h>
+#include <linux/moduleparam.h>
+
+#include "usb.h"
+
+#ifdef CONFIG_PM
+#define MAYBE_CAP_SUSPEND	USBDEVFS_CAP_SUSPEND
+#else
+#define MAYBE_CAP_SUSPEND	0
+#endif
+
+#define USB_MAXBUS			64
+#define USB_DEVICE_MAX			(USB_MAXBUS * 128)
+#define USB_SG_SIZE			16384 /* split-size for large txs */
+
+/* Mutual exclusion for ps->list in resume vs. release and remove */
+static DEFINE_MUTEX(usbfs_mutex);
+
+struct usb_dev_state {
+	struct list_head list;      /* state list */
+	struct usb_device *dev;
+	struct file *file;
+	spinlock_t lock;            /* protects the async urb lists */
+	struct list_head async_pending;
+	struct list_head async_completed;
+	struct list_head memory_list;
+	wait_queue_head_t wait;     /* wake up if a request completed */
+	wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
+	unsigned int discsignr;
+	struct pid *disc_pid;
+	const struct cred *cred;
+	sigval_t disccontext;
+	unsigned long ifclaimed;
+	u32 disabled_bulk_eps;
+	unsigned long interface_allowed_mask;
+	int not_yet_resumed;
+	bool suspend_allowed;
+	bool privileges_dropped;
+};
+
+struct usb_memory {
+	struct list_head memlist;
+	int vma_use_count;
+	int urb_use_count;
+	u32 size;
+	void *mem;
+	dma_addr_t dma_handle;
+	unsigned long vm_start;
+	struct usb_dev_state *ps;
+};
+
+struct async {
+	struct list_head asynclist;
+	struct usb_dev_state *ps;
+	struct pid *pid;
+	const struct cred *cred;
+	unsigned int signr;
+	unsigned int ifnum;
+	void __user *userbuffer;
+	void __user *userurb;
+	sigval_t userurb_sigval;
+	struct urb *urb;
+	struct usb_memory *usbm;
+	unsigned int mem_usage;
+	int status;
+	u8 bulk_addr;
+	u8 bulk_status;
+};
+
+static bool usbfs_snoop;
+module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
+
+static unsigned usbfs_snoop_max = 65536;
+module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(usbfs_snoop_max,
+		"maximum number of bytes to print while snooping");
+
+#define snoop(dev, format, arg...)				\
+	do {							\
+		if (usbfs_snoop)				\
+			dev_info(dev, format, ## arg);		\
+	} while (0)
+
+enum snoop_when {
+	SUBMIT, COMPLETE
+};
+
+#define USB_DEVICE_DEV		MKDEV(USB_DEVICE_MAJOR, 0)
+
+/* Limit on the total amount of memory we can allocate for transfers */
+static u32 usbfs_memory_mb = 16;
+module_param(usbfs_memory_mb, uint, 0644);
+MODULE_PARM_DESC(usbfs_memory_mb,
+		"maximum MB allowed for usbfs buffers (0 = no limit)");
+
+/* Hard limit, necessary to avoid arithmetic overflow */
+#define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
+
+static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
+static u64 usbfs_memory_usage;	/* Total memory currently allocated */
+
+/* Check whether it's okay to allocate more memory for a transfer */
+static int usbfs_increase_memory_usage(u64 amount)
+{
+	u64 lim, total_mem;
+	unsigned long flags;
+	int ret;
+
+	lim = READ_ONCE(usbfs_memory_mb);
+	lim <<= 20;
+
+	ret = 0;
+	spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
+	total_mem = usbfs_memory_usage + amount;
+	if (lim > 0 && total_mem > lim)
+		ret = -ENOMEM;
+	else
+		usbfs_memory_usage = total_mem;
+	spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
+
+	return ret;
+}
+
+/* Memory for a transfer is being deallocated */
+static void usbfs_decrease_memory_usage(u64 amount)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
+	if (amount > usbfs_memory_usage)
+		usbfs_memory_usage = 0;
+	else
+		usbfs_memory_usage -= amount;
+	spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
+}
+
+static int connected(struct usb_dev_state *ps)
+{
+	return (!list_empty(&ps->list) &&
+			ps->dev->state != USB_STATE_NOTATTACHED);
+}
+
+static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
+{
+	struct usb_dev_state *ps = usbm->ps;
+	struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
+	unsigned long flags;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	--*count;
+	if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
+		list_del(&usbm->memlist);
+		spin_unlock_irqrestore(&ps->lock, flags);
+
+		hcd_buffer_free_pages(hcd, usbm->size,
+				usbm->mem, usbm->dma_handle);
+		usbfs_decrease_memory_usage(
+			usbm->size + sizeof(struct usb_memory));
+		kfree(usbm);
+	} else {
+		spin_unlock_irqrestore(&ps->lock, flags);
+	}
+}
+
+static void usbdev_vm_open(struct vm_area_struct *vma)
+{
+	struct usb_memory *usbm = vma->vm_private_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&usbm->ps->lock, flags);
+	++usbm->vma_use_count;
+	spin_unlock_irqrestore(&usbm->ps->lock, flags);
+}
+
+static void usbdev_vm_close(struct vm_area_struct *vma)
+{
+	struct usb_memory *usbm = vma->vm_private_data;
+
+	dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
+}
+
+static const struct vm_operations_struct usbdev_vm_ops = {
+	.open = usbdev_vm_open,
+	.close = usbdev_vm_close
+};
+
+static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct usb_memory *usbm = NULL;
+	struct usb_dev_state *ps = file->private_data;
+	struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
+	size_t size = vma->vm_end - vma->vm_start;
+	void *mem;
+	unsigned long flags;
+	dma_addr_t dma_handle = DMA_MAPPING_ERROR;
+	int ret;
+
+	ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
+	if (ret)
+		goto error;
+
+	usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
+	if (!usbm) {
+		ret = -ENOMEM;
+		goto error_decrease_mem;
+	}
+
+	mem = hcd_buffer_alloc_pages(hcd,
+			size, GFP_USER | __GFP_NOWARN, &dma_handle);
+	if (!mem) {
+		ret = -ENOMEM;
+		goto error_free_usbm;
+	}
+
+	memset(mem, 0, size);
+
+	usbm->mem = mem;
+	usbm->dma_handle = dma_handle;
+	usbm->size = size;
+	usbm->ps = ps;
+	usbm->vm_start = vma->vm_start;
+	usbm->vma_use_count = 1;
+	INIT_LIST_HEAD(&usbm->memlist);
+
+	/*
+	 * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
+	 * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
+	 * whether we are in such cases, and then use remap_pfn_range (or
+	 * dma_mmap_coherent) to map normal (or DMA) pages into the user
+	 * space, respectively.
+	 */
+	if (dma_handle == DMA_MAPPING_ERROR) {
+		if (remap_pfn_range(vma, vma->vm_start,
+				    virt_to_phys(usbm->mem) >> PAGE_SHIFT,
+				    size, vma->vm_page_prot) < 0) {
+			dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
+			return -EAGAIN;
+		}
+	} else {
+		if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
+				      size)) {
+			dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
+			return -EAGAIN;
+		}
+	}
+
+	vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
+	vma->vm_ops = &usbdev_vm_ops;
+	vma->vm_private_data = usbm;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	list_add_tail(&usbm->memlist, &ps->memory_list);
+	spin_unlock_irqrestore(&ps->lock, flags);
+
+	return 0;
+
+error_free_usbm:
+	kfree(usbm);
+error_decrease_mem:
+	usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
+error:
+	return ret;
+}
+
+static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
+			   loff_t *ppos)
+{
+	struct usb_dev_state *ps = file->private_data;
+	struct usb_device *dev = ps->dev;
+	ssize_t ret = 0;
+	unsigned len;
+	loff_t pos;
+	int i;
+
+	pos = *ppos;
+	usb_lock_device(dev);
+	if (!connected(ps)) {
+		ret = -ENODEV;
+		goto err;
+	} else if (pos < 0) {
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (pos < sizeof(struct usb_device_descriptor)) {
+		/* 18 bytes - fits on the stack */
+		struct usb_device_descriptor temp_desc;
+
+		memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
+		le16_to_cpus(&temp_desc.bcdUSB);
+		le16_to_cpus(&temp_desc.idVendor);
+		le16_to_cpus(&temp_desc.idProduct);
+		le16_to_cpus(&temp_desc.bcdDevice);
+
+		len = sizeof(struct usb_device_descriptor) - pos;
+		if (len > nbytes)
+			len = nbytes;
+		if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
+			ret = -EFAULT;
+			goto err;
+		}
+
+		*ppos += len;
+		buf += len;
+		nbytes -= len;
+		ret += len;
+	}
+
+	pos = sizeof(struct usb_device_descriptor);
+	for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
+		struct usb_config_descriptor *config =
+			(struct usb_config_descriptor *)dev->rawdescriptors[i];
+		unsigned int length = le16_to_cpu(config->wTotalLength);
+
+		if (*ppos < pos + length) {
+
+			/* The descriptor may claim to be longer than it
+			 * really is.  Here is the actual allocated length. */
+			unsigned alloclen =
+				le16_to_cpu(dev->config[i].desc.wTotalLength);
+
+			len = length - (*ppos - pos);
+			if (len > nbytes)
+				len = nbytes;
+
+			/* Simply don't write (skip over) unallocated parts */
+			if (alloclen > (*ppos - pos)) {
+				alloclen -= (*ppos - pos);
+				if (copy_to_user(buf,
+				    dev->rawdescriptors[i] + (*ppos - pos),
+				    min(len, alloclen))) {
+					ret = -EFAULT;
+					goto err;
+				}
+			}
+
+			*ppos += len;
+			buf += len;
+			nbytes -= len;
+			ret += len;
+		}
+
+		pos += length;
+	}
+
+err:
+	usb_unlock_device(dev);
+	return ret;
+}
+
+/*
+ * async list handling
+ */
+
+static struct async *alloc_async(unsigned int numisoframes)
+{
+	struct async *as;
+
+	as = kzalloc(sizeof(struct async), GFP_KERNEL);
+	if (!as)
+		return NULL;
+	as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
+	if (!as->urb) {
+		kfree(as);
+		return NULL;
+	}
+	return as;
+}
+
+static void free_async(struct async *as)
+{
+	int i;
+
+	put_pid(as->pid);
+	if (as->cred)
+		put_cred(as->cred);
+	for (i = 0; i < as->urb->num_sgs; i++) {
+		if (sg_page(&as->urb->sg[i]))
+			kfree(sg_virt(&as->urb->sg[i]));
+	}
+
+	kfree(as->urb->sg);
+	if (as->usbm == NULL)
+		kfree(as->urb->transfer_buffer);
+	else
+		dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
+
+	kfree(as->urb->setup_packet);
+	usb_free_urb(as->urb);
+	usbfs_decrease_memory_usage(as->mem_usage);
+	kfree(as);
+}
+
+static void async_newpending(struct async *as)
+{
+	struct usb_dev_state *ps = as->ps;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	list_add_tail(&as->asynclist, &ps->async_pending);
+	spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+static void async_removepending(struct async *as)
+{
+	struct usb_dev_state *ps = as->ps;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	list_del_init(&as->asynclist);
+	spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+static struct async *async_getcompleted(struct usb_dev_state *ps)
+{
+	unsigned long flags;
+	struct async *as = NULL;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	if (!list_empty(&ps->async_completed)) {
+		as = list_entry(ps->async_completed.next, struct async,
+				asynclist);
+		list_del_init(&as->asynclist);
+	}
+	spin_unlock_irqrestore(&ps->lock, flags);
+	return as;
+}
+
+static struct async *async_getpending(struct usb_dev_state *ps,
+					     void __user *userurb)
+{
+	struct async *as;
+
+	list_for_each_entry(as, &ps->async_pending, asynclist)
+		if (as->userurb == userurb) {
+			list_del_init(&as->asynclist);
+			return as;
+		}
+
+	return NULL;
+}
+
+static void snoop_urb(struct usb_device *udev,
+		void __user *userurb, int pipe, unsigned length,
+		int timeout_or_status, enum snoop_when when,
+		unsigned char *data, unsigned data_len)
+{
+	static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
+	static const char *dirs[] = {"out", "in"};
+	int ep;
+	const char *t, *d;
+
+	if (!usbfs_snoop)
+		return;
+
+	ep = usb_pipeendpoint(pipe);
+	t = types[usb_pipetype(pipe)];
+	d = dirs[!!usb_pipein(pipe)];
+
+	if (userurb) {		/* Async */
+		if (when == SUBMIT)
+			dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
+					"length %u\n",
+					userurb, ep, t, d, length);
+		else
+			dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
+					"actual_length %u status %d\n",
+					userurb, ep, t, d, length,
+					timeout_or_status);
+	} else {
+		if (when == SUBMIT)
+			dev_info(&udev->dev, "ep%d %s-%s, length %u, "
+					"timeout %d\n",
+					ep, t, d, length, timeout_or_status);
+		else
+			dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
+					"status %d\n",
+					ep, t, d, length, timeout_or_status);
+	}
+
+	data_len = min(data_len, usbfs_snoop_max);
+	if (data && data_len > 0) {
+		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
+			data, data_len, 1);
+	}
+}
+
+static void snoop_urb_data(struct urb *urb, unsigned len)
+{
+	int i, size;
+
+	len = min(len, usbfs_snoop_max);
+	if (!usbfs_snoop || len == 0)
+		return;
+
+	if (urb->num_sgs == 0) {
+		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
+			urb->transfer_buffer, len, 1);
+		return;
+	}
+
+	for (i = 0; i < urb->num_sgs && len; i++) {
+		size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
+		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
+			sg_virt(&urb->sg[i]), size, 1);
+		len -= size;
+	}
+}
+
+static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
+{
+	unsigned i, len, size;
+
+	if (urb->number_of_packets > 0)		/* Isochronous */
+		len = urb->transfer_buffer_length;
+	else					/* Non-Isoc */
+		len = urb->actual_length;
+
+	if (urb->num_sgs == 0) {
+		if (copy_to_user(userbuffer, urb->transfer_buffer, len))
+			return -EFAULT;
+		return 0;
+	}
+
+	for (i = 0; i < urb->num_sgs && len; i++) {
+		size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
+		if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
+			return -EFAULT;
+		userbuffer += size;
+		len -= size;
+	}
+
+	return 0;
+}
+
+#define AS_CONTINUATION	1
+#define AS_UNLINK	2
+
+static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
+__releases(ps->lock)
+__acquires(ps->lock)
+{
+	struct urb *urb;
+	struct async *as;
+
+	/* Mark all the pending URBs that match bulk_addr, up to but not
+	 * including the first one without AS_CONTINUATION.  If such an
+	 * URB is encountered then a new transfer has already started so
+	 * the endpoint doesn't need to be disabled; otherwise it does.
+	 */
+	list_for_each_entry(as, &ps->async_pending, asynclist) {
+		if (as->bulk_addr == bulk_addr) {
+			if (as->bulk_status != AS_CONTINUATION)
+				goto rescan;
+			as->bulk_status = AS_UNLINK;
+			as->bulk_addr = 0;
+		}
+	}
+	ps->disabled_bulk_eps |= (1 << bulk_addr);
+
+	/* Now carefully unlink all the marked pending URBs */
+ rescan:
+	list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
+		if (as->bulk_status == AS_UNLINK) {
+			as->bulk_status = 0;		/* Only once */
+			urb = as->urb;
+			usb_get_urb(urb);
+			spin_unlock(&ps->lock);		/* Allow completions */
+			usb_unlink_urb(urb);
+			usb_put_urb(urb);
+			spin_lock(&ps->lock);
+			goto rescan;
+		}
+	}
+}
+
+static void async_completed(struct urb *urb)
+{
+	struct async *as = urb->context;
+	struct usb_dev_state *ps = as->ps;
+	struct pid *pid = NULL;
+	const struct cred *cred = NULL;
+	unsigned long flags;
+	sigval_t addr;
+	int signr, errno;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	list_move_tail(&as->asynclist, &ps->async_completed);
+	as->status = urb->status;
+	signr = as->signr;
+	if (signr) {
+		errno = as->status;
+		addr = as->userurb_sigval;
+		pid = get_pid(as->pid);
+		cred = get_cred(as->cred);
+	}
+	snoop(&urb->dev->dev, "urb complete\n");
+	snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
+			as->status, COMPLETE, NULL, 0);
+	if (usb_urb_dir_in(urb))
+		snoop_urb_data(urb, urb->actual_length);
+
+	if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
+			as->status != -ENOENT)
+		cancel_bulk_urbs(ps, as->bulk_addr);
+
+	wake_up(&ps->wait);
+	spin_unlock_irqrestore(&ps->lock, flags);
+
+	if (signr) {
+		kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
+		put_pid(pid);
+		put_cred(cred);
+	}
+}
+
+static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
+{
+	struct urb *urb;
+	struct async *as;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	while (!list_empty(list)) {
+		as = list_last_entry(list, struct async, asynclist);
+		list_del_init(&as->asynclist);
+		urb = as->urb;
+		usb_get_urb(urb);
+
+		/* drop the spinlock so the completion handler can run */
+		spin_unlock_irqrestore(&ps->lock, flags);
+		usb_kill_urb(urb);
+		usb_put_urb(urb);
+		spin_lock_irqsave(&ps->lock, flags);
+	}
+	spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+static void destroy_async_on_interface(struct usb_dev_state *ps,
+				       unsigned int ifnum)
+{
+	struct list_head *p, *q, hitlist;
+	unsigned long flags;
+
+	INIT_LIST_HEAD(&hitlist);
+	spin_lock_irqsave(&ps->lock, flags);
+	list_for_each_safe(p, q, &ps->async_pending)
+		if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
+			list_move_tail(p, &hitlist);
+	spin_unlock_irqrestore(&ps->lock, flags);
+	destroy_async(ps, &hitlist);
+}
+
+static void destroy_all_async(struct usb_dev_state *ps)
+{
+	destroy_async(ps, &ps->async_pending);
+}
+
+/*
+ * interface claims are made only at the request of user level code,
+ * which can also release them (explicitly or by closing files).
+ * they're also undone when devices disconnect.
+ */
+
+static int driver_probe(struct usb_interface *intf,
+			const struct usb_device_id *id)
+{
+	return -ENODEV;
+}
+
+static void driver_disconnect(struct usb_interface *intf)
+{
+	struct usb_dev_state *ps = usb_get_intfdata(intf);
+	unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
+
+	if (!ps)
+		return;
+
+	/* NOTE:  this relies on usbcore having canceled and completed
+	 * all pending I/O requests; 2.6 does that.
+	 */
+
+	if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
+		clear_bit(ifnum, &ps->ifclaimed);
+	else
+		dev_warn(&intf->dev, "interface number %u out of range\n",
+			 ifnum);
+
+	usb_set_intfdata(intf, NULL);
+
+	/* force async requests to complete */
+	destroy_async_on_interface(ps, ifnum);
+}
+
+/* We don't care about suspend/resume of claimed interfaces */
+static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
+{
+	return 0;
+}
+
+static int driver_resume(struct usb_interface *intf)
+{
+	return 0;
+}
+
+#ifdef CONFIG_PM
+/* The following routines apply to the entire device, not interfaces */
+void usbfs_notify_suspend(struct usb_device *udev)
+{
+	/* We don't need to handle this */
+}
+
+void usbfs_notify_resume(struct usb_device *udev)
+{
+	struct usb_dev_state *ps;
+
+	/* Protect against simultaneous remove or release */
+	mutex_lock(&usbfs_mutex);
+	list_for_each_entry(ps, &udev->filelist, list) {
+		WRITE_ONCE(ps->not_yet_resumed, 0);
+		wake_up_all(&ps->wait_for_resume);
+	}
+	mutex_unlock(&usbfs_mutex);
+}
+#endif
+
+struct usb_driver usbfs_driver = {
+	.name =		"usbfs",
+	.probe =	driver_probe,
+	.disconnect =	driver_disconnect,
+	.suspend =	driver_suspend,
+	.resume =	driver_resume,
+	.supports_autosuspend = 1,
+};
+
+static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
+{
+	struct usb_device *dev = ps->dev;
+	struct usb_interface *intf;
+	int err;
+
+	if (ifnum >= 8*sizeof(ps->ifclaimed))
+		return -EINVAL;
+	/* already claimed */
+	if (test_bit(ifnum, &ps->ifclaimed))
+		return 0;
+
+	if (ps->privileges_dropped &&
+			!test_bit(ifnum, &ps->interface_allowed_mask))
+		return -EACCES;
+
+	intf = usb_ifnum_to_if(dev, ifnum);
+	if (!intf)
+		err = -ENOENT;
+	else {
+		unsigned int old_suppress;
+
+		/* suppress uevents while claiming interface */
+		old_suppress = dev_get_uevent_suppress(&intf->dev);
+		dev_set_uevent_suppress(&intf->dev, 1);
+		err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
+		dev_set_uevent_suppress(&intf->dev, old_suppress);
+	}
+	if (err == 0)
+		set_bit(ifnum, &ps->ifclaimed);
+	return err;
+}
+
+static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
+{
+	struct usb_device *dev;
+	struct usb_interface *intf;
+	int err;
+
+	err = -EINVAL;
+	if (ifnum >= 8*sizeof(ps->ifclaimed))
+		return err;
+	dev = ps->dev;
+	intf = usb_ifnum_to_if(dev, ifnum);
+	if (!intf)
+		err = -ENOENT;
+	else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
+		unsigned int old_suppress;
+
+		/* suppress uevents while releasing interface */
+		old_suppress = dev_get_uevent_suppress(&intf->dev);
+		dev_set_uevent_suppress(&intf->dev, 1);
+		usb_driver_release_interface(&usbfs_driver, intf);
+		dev_set_uevent_suppress(&intf->dev, old_suppress);
+		err = 0;
+	}
+	return err;
+}
+
+static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
+{
+	if (ps->dev->state != USB_STATE_CONFIGURED)
+		return -EHOSTUNREACH;
+	if (ifnum >= 8*sizeof(ps->ifclaimed))
+		return -EINVAL;
+	if (test_bit(ifnum, &ps->ifclaimed))
+		return 0;
+	/* if not yet claimed, claim it for the driver */
+	dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
+		 "interface %u before use\n", task_pid_nr(current),
+		 current->comm, ifnum);
+	return claimintf(ps, ifnum);
+}
+
+static int findintfep(struct usb_device *dev, unsigned int ep)
+{
+	unsigned int i, j, e;
+	struct usb_interface *intf;
+	struct usb_host_interface *alts;
+	struct usb_endpoint_descriptor *endpt;
+
+	if (ep & ~(USB_DIR_IN|0xf))
+		return -EINVAL;
+	if (!dev->actconfig)
+		return -ESRCH;
+	for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
+		intf = dev->actconfig->interface[i];
+		for (j = 0; j < intf->num_altsetting; j++) {
+			alts = &intf->altsetting[j];
+			for (e = 0; e < alts->desc.bNumEndpoints; e++) {
+				endpt = &alts->endpoint[e].desc;
+				if (endpt->bEndpointAddress == ep)
+					return alts->desc.bInterfaceNumber;
+			}
+		}
+	}
+	return -ENOENT;
+}
+
+static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
+			   unsigned int request, unsigned int index)
+{
+	int ret = 0;
+	struct usb_host_interface *alt_setting;
+
+	if (ps->dev->state != USB_STATE_UNAUTHENTICATED
+	 && ps->dev->state != USB_STATE_ADDRESS
+	 && ps->dev->state != USB_STATE_CONFIGURED)
+		return -EHOSTUNREACH;
+	if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
+		return 0;
+
+	/*
+	 * check for the special corner case 'get_device_id' in the printer
+	 * class specification, which we always want to allow as it is used
+	 * to query things like ink level, etc.
+	 */
+	if (requesttype == 0xa1 && request == 0) {
+		alt_setting = usb_find_alt_setting(ps->dev->actconfig,
+						   index >> 8, index & 0xff);
+		if (alt_setting
+		 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
+			return 0;
+	}
+
+	index &= 0xff;
+	switch (requesttype & USB_RECIP_MASK) {
+	case USB_RECIP_ENDPOINT:
+		if ((index & ~USB_DIR_IN) == 0)
+			return 0;
+		ret = findintfep(ps->dev, index);
+		if (ret < 0) {
+			/*
+			 * Some not fully compliant Win apps seem to get
+			 * index wrong and have the endpoint number here
+			 * rather than the endpoint address (with the
+			 * correct direction). Win does let this through,
+			 * so we'll not reject it here but leave it to
+			 * the device to not break KVM. But we warn.
+			 */
+			ret = findintfep(ps->dev, index ^ 0x80);
+			if (ret >= 0)
+				dev_info(&ps->dev->dev,
+					"%s: process %i (%s) requesting ep %02x but needs %02x\n",
+					__func__, task_pid_nr(current),
+					current->comm, index, index ^ 0x80);
+		}
+		if (ret >= 0)
+			ret = checkintf(ps, ret);
+		break;
+
+	case USB_RECIP_INTERFACE:
+		ret = checkintf(ps, index);
+		break;
+	}
+	return ret;
+}
+
+static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
+						     unsigned char ep)
+{
+	if (ep & USB_ENDPOINT_DIR_MASK)
+		return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
+	else
+		return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
+}
+
+static int parse_usbdevfs_streams(struct usb_dev_state *ps,
+				  struct usbdevfs_streams __user *streams,
+				  unsigned int *num_streams_ret,
+				  unsigned int *num_eps_ret,
+				  struct usb_host_endpoint ***eps_ret,
+				  struct usb_interface **intf_ret)
+{
+	unsigned int i, num_streams, num_eps;
+	struct usb_host_endpoint **eps;
+	struct usb_interface *intf = NULL;
+	unsigned char ep;
+	int ifnum, ret;
+
+	if (get_user(num_streams, &streams->num_streams) ||
+	    get_user(num_eps, &streams->num_eps))
+		return -EFAULT;
+
+	if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
+		return -EINVAL;
+
+	/* The XHCI controller allows max 2 ^ 16 streams */
+	if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
+		return -EINVAL;
+
+	eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
+	if (!eps)
+		return -ENOMEM;
+
+	for (i = 0; i < num_eps; i++) {
+		if (get_user(ep, &streams->eps[i])) {
+			ret = -EFAULT;
+			goto error;
+		}
+		eps[i] = ep_to_host_endpoint(ps->dev, ep);
+		if (!eps[i]) {
+			ret = -EINVAL;
+			goto error;
+		}
+
+		/* usb_alloc/free_streams operate on an usb_interface */
+		ifnum = findintfep(ps->dev, ep);
+		if (ifnum < 0) {
+			ret = ifnum;
+			goto error;
+		}
+
+		if (i == 0) {
+			ret = checkintf(ps, ifnum);
+			if (ret < 0)
+				goto error;
+			intf = usb_ifnum_to_if(ps->dev, ifnum);
+		} else {
+			/* Verify all eps belong to the same interface */
+			if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
+				ret = -EINVAL;
+				goto error;
+			}
+		}
+	}
+
+	if (num_streams_ret)
+		*num_streams_ret = num_streams;
+	*num_eps_ret = num_eps;
+	*eps_ret = eps;
+	*intf_ret = intf;
+
+	return 0;
+
+error:
+	kfree(eps);
+	return ret;
+}
+
+static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
+{
+	struct device *dev;
+
+	dev = bus_find_device_by_devt(&usb_bus_type, devt);
+	if (!dev)
+		return NULL;
+	return to_usb_device(dev);
+}
+
+/*
+ * file operations
+ */
+static int usbdev_open(struct inode *inode, struct file *file)
+{
+	struct usb_device *dev = NULL;
+	struct usb_dev_state *ps;
+	int ret;
+
+	ret = -ENOMEM;
+	ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
+	if (!ps)
+		goto out_free_ps;
+
+	ret = -ENODEV;
+
+	/* usbdev device-node */
+	if (imajor(inode) == USB_DEVICE_MAJOR)
+		dev = usbdev_lookup_by_devt(inode->i_rdev);
+	if (!dev)
+		goto out_free_ps;
+
+	usb_lock_device(dev);
+	if (dev->state == USB_STATE_NOTATTACHED)
+		goto out_unlock_device;
+
+	ret = usb_autoresume_device(dev);
+	if (ret)
+		goto out_unlock_device;
+
+	ps->dev = dev;
+	ps->file = file;
+	ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
+	spin_lock_init(&ps->lock);
+	INIT_LIST_HEAD(&ps->list);
+	INIT_LIST_HEAD(&ps->async_pending);
+	INIT_LIST_HEAD(&ps->async_completed);
+	INIT_LIST_HEAD(&ps->memory_list);
+	init_waitqueue_head(&ps->wait);
+	init_waitqueue_head(&ps->wait_for_resume);
+	ps->disc_pid = get_pid(task_pid(current));
+	ps->cred = get_current_cred();
+	smp_wmb();
+
+	/* Can't race with resume; the device is already active */
+	list_add_tail(&ps->list, &dev->filelist);
+	file->private_data = ps;
+	usb_unlock_device(dev);
+	snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
+			current->comm);
+	return ret;
+
+ out_unlock_device:
+	usb_unlock_device(dev);
+	usb_put_dev(dev);
+ out_free_ps:
+	kfree(ps);
+	return ret;
+}
+
+static int usbdev_release(struct inode *inode, struct file *file)
+{
+	struct usb_dev_state *ps = file->private_data;
+	struct usb_device *dev = ps->dev;
+	unsigned int ifnum;
+	struct async *as;
+
+	usb_lock_device(dev);
+	usb_hub_release_all_ports(dev, ps);
+
+	/* Protect against simultaneous resume */
+	mutex_lock(&usbfs_mutex);
+	list_del_init(&ps->list);
+	mutex_unlock(&usbfs_mutex);
+
+	for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
+			ifnum++) {
+		if (test_bit(ifnum, &ps->ifclaimed))
+			releaseintf(ps, ifnum);
+	}
+	destroy_all_async(ps);
+	if (!ps->suspend_allowed)
+		usb_autosuspend_device(dev);
+	usb_unlock_device(dev);
+	usb_put_dev(dev);
+	put_pid(ps->disc_pid);
+	put_cred(ps->cred);
+
+	as = async_getcompleted(ps);
+	while (as) {
+		free_async(as);
+		as = async_getcompleted(ps);
+	}
+
+	kfree(ps);
+	return 0;
+}
+
+static void usbfs_blocking_completion(struct urb *urb)
+{
+	complete((struct completion *) urb->context);
+}
+
+/*
+ * Much like usb_start_wait_urb, but returns status separately from
+ * actual_length and uses a killable wait.
+ */
+static int usbfs_start_wait_urb(struct urb *urb, int timeout,
+		unsigned int *actlen)
+{
+	DECLARE_COMPLETION_ONSTACK(ctx);
+	unsigned long expire;
+	int rc;
+
+	urb->context = &ctx;
+	urb->complete = usbfs_blocking_completion;
+	*actlen = 0;
+	rc = usb_submit_urb(urb, GFP_KERNEL);
+	if (unlikely(rc))
+		return rc;
+
+	expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
+	rc = wait_for_completion_killable_timeout(&ctx, expire);
+	if (rc <= 0) {
+		usb_kill_urb(urb);
+		*actlen = urb->actual_length;
+		if (urb->status != -ENOENT)
+			;	/* Completed before it was killed */
+		else if (rc < 0)
+			return -EINTR;
+		else
+			return -ETIMEDOUT;
+	}
+	*actlen = urb->actual_length;
+	return urb->status;
+}
+
+static int do_proc_control(struct usb_dev_state *ps,
+		struct usbdevfs_ctrltransfer *ctrl)
+{
+	struct usb_device *dev = ps->dev;
+	unsigned int tmo;
+	unsigned char *tbuf;
+	unsigned int wLength, actlen;
+	int i, pipe, ret;
+	struct urb *urb = NULL;
+	struct usb_ctrlrequest *dr = NULL;
+
+	ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
+			      ctrl->wIndex);
+	if (ret)
+		return ret;
+	wLength = ctrl->wLength;	/* To suppress 64k PAGE_SIZE warning */
+	if (wLength > PAGE_SIZE)
+		return -EINVAL;
+	ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
+			sizeof(struct usb_ctrlrequest));
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
+	tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
+	if (!tbuf)
+		goto done;
+	urb = usb_alloc_urb(0, GFP_NOIO);
+	if (!urb)
+		goto done;
+	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
+	if (!dr)
+		goto done;
+
+	dr->bRequestType = ctrl->bRequestType;
+	dr->bRequest = ctrl->bRequest;
+	dr->wValue = cpu_to_le16(ctrl->wValue);
+	dr->wIndex = cpu_to_le16(ctrl->wIndex);
+	dr->wLength = cpu_to_le16(ctrl->wLength);
+
+	tmo = ctrl->timeout;
+	snoop(&dev->dev, "control urb: bRequestType=%02x "
+		"bRequest=%02x wValue=%04x "
+		"wIndex=%04x wLength=%04x\n",
+		ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
+		ctrl->wIndex, ctrl->wLength);
+
+	if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
+		pipe = usb_rcvctrlpipe(dev, 0);
+		usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
+				wLength, NULL, NULL);
+		snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
+
+		usb_unlock_device(dev);
+		i = usbfs_start_wait_urb(urb, tmo, &actlen);
+
+		/* Linger a bit, prior to the next control message. */
+		if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
+			msleep(200);
+		usb_lock_device(dev);
+		snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
+		if (!i && actlen) {
+			if (copy_to_user(ctrl->data, tbuf, actlen)) {
+				ret = -EFAULT;
+				goto done;
+			}
+		}
+	} else {
+		if (wLength) {
+			if (copy_from_user(tbuf, ctrl->data, wLength)) {
+				ret = -EFAULT;
+				goto done;
+			}
+		}
+		pipe = usb_sndctrlpipe(dev, 0);
+		usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
+				wLength, NULL, NULL);
+		snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
+
+		usb_unlock_device(dev);
+		i = usbfs_start_wait_urb(urb, tmo, &actlen);
+
+		/* Linger a bit, prior to the next control message. */
+		if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
+			msleep(200);
+		usb_lock_device(dev);
+		snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
+	}
+	if (i < 0 && i != -EPIPE) {
+		dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
+			   "failed cmd %s rqt %u rq %u len %u ret %d\n",
+			   current->comm, ctrl->bRequestType, ctrl->bRequest,
+			   ctrl->wLength, i);
+	}
+	ret = (i < 0 ? i : actlen);
+
+ done:
+	kfree(dr);
+	usb_free_urb(urb);
+	free_page((unsigned long) tbuf);
+	usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
+			sizeof(struct usb_ctrlrequest));
+	return ret;
+}
+
+static int proc_control(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_ctrltransfer ctrl;
+
+	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
+		return -EFAULT;
+	return do_proc_control(ps, &ctrl);
+}
+
+static int do_proc_bulk(struct usb_dev_state *ps,
+		struct usbdevfs_bulktransfer *bulk)
+{
+	struct usb_device *dev = ps->dev;
+	unsigned int tmo, len1, len2, pipe;
+	unsigned char *tbuf;
+	int i, ret;
+	struct urb *urb = NULL;
+	struct usb_host_endpoint *ep;
+
+	ret = findintfep(ps->dev, bulk->ep);
+	if (ret < 0)
+		return ret;
+	ret = checkintf(ps, ret);
+	if (ret)
+		return ret;
+
+	len1 = bulk->len;
+	if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
+		return -EINVAL;
+
+	if (bulk->ep & USB_DIR_IN)
+		pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
+	else
+		pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
+	ep = usb_pipe_endpoint(dev, pipe);
+	if (!ep || !usb_endpoint_maxp(&ep->desc))
+		return -EINVAL;
+	ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
+	if (ret)
+		return ret;
+
+	/*
+	 * len1 can be almost arbitrarily large.  Don't WARN if it's
+	 * too big, just fail the request.
+	 */
+	ret = -ENOMEM;
+	tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
+	if (!tbuf)
+		goto done;
+	urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!urb)
+		goto done;
+
+	if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
+			USB_ENDPOINT_XFER_INT) {
+		pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
+		usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
+				NULL, NULL, ep->desc.bInterval);
+	} else {
+		usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
+	}
+
+	tmo = bulk->timeout;
+	if (bulk->ep & 0x80) {
+		snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
+
+		usb_unlock_device(dev);
+		i = usbfs_start_wait_urb(urb, tmo, &len2);
+		usb_lock_device(dev);
+		snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
+
+		if (!i && len2) {
+			if (copy_to_user(bulk->data, tbuf, len2)) {
+				ret = -EFAULT;
+				goto done;
+			}
+		}
+	} else {
+		if (len1) {
+			if (copy_from_user(tbuf, bulk->data, len1)) {
+				ret = -EFAULT;
+				goto done;
+			}
+		}
+		snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
+
+		usb_unlock_device(dev);
+		i = usbfs_start_wait_urb(urb, tmo, &len2);
+		usb_lock_device(dev);
+		snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
+	}
+	ret = (i < 0 ? i : len2);
+ done:
+	usb_free_urb(urb);
+	kfree(tbuf);
+	usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
+	return ret;
+}
+
+static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_bulktransfer bulk;
+
+	if (copy_from_user(&bulk, arg, sizeof(bulk)))
+		return -EFAULT;
+	return do_proc_bulk(ps, &bulk);
+}
+
+static void check_reset_of_active_ep(struct usb_device *udev,
+		unsigned int epnum, char *ioctl_name)
+{
+	struct usb_host_endpoint **eps;
+	struct usb_host_endpoint *ep;
+
+	eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
+	ep = eps[epnum & 0x0f];
+	if (ep && !list_empty(&ep->urb_list))
+		dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
+				task_pid_nr(current), current->comm,
+				ioctl_name, epnum);
+}
+
+static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned int ep;
+	int ret;
+
+	if (get_user(ep, (unsigned int __user *)arg))
+		return -EFAULT;
+	ret = findintfep(ps->dev, ep);
+	if (ret < 0)
+		return ret;
+	ret = checkintf(ps, ret);
+	if (ret)
+		return ret;
+	check_reset_of_active_ep(ps->dev, ep, "RESETEP");
+	usb_reset_endpoint(ps->dev, ep);
+	return 0;
+}
+
+static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned int ep;
+	int pipe;
+	int ret;
+
+	if (get_user(ep, (unsigned int __user *)arg))
+		return -EFAULT;
+	ret = findintfep(ps->dev, ep);
+	if (ret < 0)
+		return ret;
+	ret = checkintf(ps, ret);
+	if (ret)
+		return ret;
+	check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
+	if (ep & USB_DIR_IN)
+		pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
+	else
+		pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
+
+	return usb_clear_halt(ps->dev, pipe);
+}
+
+static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_getdriver gd;
+	struct usb_interface *intf;
+	int ret;
+
+	if (copy_from_user(&gd, arg, sizeof(gd)))
+		return -EFAULT;
+	intf = usb_ifnum_to_if(ps->dev, gd.interface);
+	if (!intf || !intf->dev.driver)
+		ret = -ENODATA;
+	else {
+		strscpy(gd.driver, intf->dev.driver->name,
+				sizeof(gd.driver));
+		ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
+	}
+	return ret;
+}
+
+static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_connectinfo ci;
+
+	memset(&ci, 0, sizeof(ci));
+	ci.devnum = ps->dev->devnum;
+	ci.slow = ps->dev->speed == USB_SPEED_LOW;
+
+	if (copy_to_user(arg, &ci, sizeof(ci)))
+		return -EFAULT;
+	return 0;
+}
+
+static int proc_conninfo_ex(struct usb_dev_state *ps,
+			    void __user *arg, size_t size)
+{
+	struct usbdevfs_conninfo_ex ci;
+	struct usb_device *udev = ps->dev;
+
+	if (size < sizeof(ci.size))
+		return -EINVAL;
+
+	memset(&ci, 0, sizeof(ci));
+	ci.size = sizeof(ci);
+	ci.busnum = udev->bus->busnum;
+	ci.devnum = udev->devnum;
+	ci.speed = udev->speed;
+
+	while (udev && udev->portnum != 0) {
+		if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
+			ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
+					udev->portnum;
+		udev = udev->parent;
+	}
+
+	if (ci.num_ports < ARRAY_SIZE(ci.ports))
+		memmove(&ci.ports[0],
+			&ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
+			ci.num_ports);
+
+	if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int proc_resetdevice(struct usb_dev_state *ps)
+{
+	struct usb_host_config *actconfig = ps->dev->actconfig;
+	struct usb_interface *interface;
+	int i, number;
+
+	/* Don't allow a device reset if the process has dropped the
+	 * privilege to do such things and any of the interfaces are
+	 * currently claimed.
+	 */
+	if (ps->privileges_dropped && actconfig) {
+		for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
+			interface = actconfig->interface[i];
+			number = interface->cur_altsetting->desc.bInterfaceNumber;
+			if (usb_interface_claimed(interface) &&
+					!test_bit(number, &ps->ifclaimed)) {
+				dev_warn(&ps->dev->dev,
+					"usbfs: interface %d claimed by %s while '%s' resets device\n",
+					number,	interface->dev.driver->name, current->comm);
+				return -EACCES;
+			}
+		}
+	}
+
+	return usb_reset_device(ps->dev);
+}
+
+static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_setinterface setintf;
+	int ret;
+
+	if (copy_from_user(&setintf, arg, sizeof(setintf)))
+		return -EFAULT;
+	ret = checkintf(ps, setintf.interface);
+	if (ret)
+		return ret;
+
+	destroy_async_on_interface(ps, setintf.interface);
+
+	return usb_set_interface(ps->dev, setintf.interface,
+			setintf.altsetting);
+}
+
+static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
+{
+	int u;
+	int status = 0;
+	struct usb_host_config *actconfig;
+
+	if (get_user(u, (int __user *)arg))
+		return -EFAULT;
+
+	actconfig = ps->dev->actconfig;
+
+	/* Don't touch the device if any interfaces are claimed.
+	 * It could interfere with other drivers' operations, and if
+	 * an interface is claimed by usbfs it could easily deadlock.
+	 */
+	if (actconfig) {
+		int i;
+
+		for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
+			if (usb_interface_claimed(actconfig->interface[i])) {
+				dev_warn(&ps->dev->dev,
+					"usbfs: interface %d claimed by %s "
+					"while '%s' sets config #%d\n",
+					actconfig->interface[i]
+						->cur_altsetting
+						->desc.bInterfaceNumber,
+					actconfig->interface[i]
+						->dev.driver->name,
+					current->comm, u);
+				status = -EBUSY;
+				break;
+			}
+		}
+	}
+
+	/* SET_CONFIGURATION is often abused as a "cheap" driver reset,
+	 * so avoid usb_set_configuration()'s kick to sysfs
+	 */
+	if (status == 0) {
+		if (actconfig && actconfig->desc.bConfigurationValue == u)
+			status = usb_reset_configuration(ps->dev);
+		else
+			status = usb_set_configuration(ps->dev, u);
+	}
+
+	return status;
+}
+
+static struct usb_memory *
+find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
+{
+	struct usb_memory *usbm = NULL, *iter;
+	unsigned long flags;
+	unsigned long uurb_start = (unsigned long)uurb->buffer;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	list_for_each_entry(iter, &ps->memory_list, memlist) {
+		if (uurb_start >= iter->vm_start &&
+				uurb_start < iter->vm_start + iter->size) {
+			if (uurb->buffer_length > iter->vm_start + iter->size -
+					uurb_start) {
+				usbm = ERR_PTR(-EINVAL);
+			} else {
+				usbm = iter;
+				usbm->urb_use_count++;
+			}
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&ps->lock, flags);
+	return usbm;
+}
+
+static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
+			struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
+			void __user *arg, sigval_t userurb_sigval)
+{
+	struct usbdevfs_iso_packet_desc *isopkt = NULL;
+	struct usb_host_endpoint *ep;
+	struct async *as = NULL;
+	struct usb_ctrlrequest *dr = NULL;
+	unsigned int u, totlen, isofrmlen;
+	int i, ret, num_sgs = 0, ifnum = -1;
+	int number_of_packets = 0;
+	unsigned int stream_id = 0;
+	void *buf;
+	bool is_in;
+	bool allow_short = false;
+	bool allow_zero = false;
+	unsigned long mask =	USBDEVFS_URB_SHORT_NOT_OK |
+				USBDEVFS_URB_BULK_CONTINUATION |
+				USBDEVFS_URB_NO_FSBR |
+				USBDEVFS_URB_ZERO_PACKET |
+				USBDEVFS_URB_NO_INTERRUPT;
+	/* USBDEVFS_URB_ISO_ASAP is a special case */
+	if (uurb->type == USBDEVFS_URB_TYPE_ISO)
+		mask |= USBDEVFS_URB_ISO_ASAP;
+
+	if (uurb->flags & ~mask)
+			return -EINVAL;
+
+	if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
+		return -EINVAL;
+	if (uurb->buffer_length > 0 && !uurb->buffer)
+		return -EINVAL;
+	if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
+	    (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
+		ifnum = findintfep(ps->dev, uurb->endpoint);
+		if (ifnum < 0)
+			return ifnum;
+		ret = checkintf(ps, ifnum);
+		if (ret)
+			return ret;
+	}
+	ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
+	if (!ep)
+		return -ENOENT;
+	is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
+
+	u = 0;
+	switch (uurb->type) {
+	case USBDEVFS_URB_TYPE_CONTROL:
+		if (!usb_endpoint_xfer_control(&ep->desc))
+			return -EINVAL;
+		/* min 8 byte setup packet */
+		if (uurb->buffer_length < 8)
+			return -EINVAL;
+		dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
+		if (!dr)
+			return -ENOMEM;
+		if (copy_from_user(dr, uurb->buffer, 8)) {
+			ret = -EFAULT;
+			goto error;
+		}
+		if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
+			ret = -EINVAL;
+			goto error;
+		}
+		ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
+				      le16_to_cpu(dr->wIndex));
+		if (ret)
+			goto error;
+		uurb->buffer_length = le16_to_cpu(dr->wLength);
+		uurb->buffer += 8;
+		if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
+			is_in = true;
+			uurb->endpoint |= USB_DIR_IN;
+		} else {
+			is_in = false;
+			uurb->endpoint &= ~USB_DIR_IN;
+		}
+		if (is_in)
+			allow_short = true;
+		snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
+			"bRequest=%02x wValue=%04x "
+			"wIndex=%04x wLength=%04x\n",
+			dr->bRequestType, dr->bRequest,
+			__le16_to_cpu(dr->wValue),
+			__le16_to_cpu(dr->wIndex),
+			__le16_to_cpu(dr->wLength));
+		u = sizeof(struct usb_ctrlrequest);
+		break;
+
+	case USBDEVFS_URB_TYPE_BULK:
+		if (!is_in)
+			allow_zero = true;
+		else
+			allow_short = true;
+		switch (usb_endpoint_type(&ep->desc)) {
+		case USB_ENDPOINT_XFER_CONTROL:
+		case USB_ENDPOINT_XFER_ISOC:
+			return -EINVAL;
+		case USB_ENDPOINT_XFER_INT:
+			/* allow single-shot interrupt transfers */
+			uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
+			goto interrupt_urb;
+		}
+		num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
+		if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
+			num_sgs = 0;
+		if (ep->streams)
+			stream_id = uurb->stream_id;
+		break;
+
+	case USBDEVFS_URB_TYPE_INTERRUPT:
+		if (!usb_endpoint_xfer_int(&ep->desc))
+			return -EINVAL;
+ interrupt_urb:
+		if (!is_in)
+			allow_zero = true;
+		else
+			allow_short = true;
+		break;
+
+	case USBDEVFS_URB_TYPE_ISO:
+		/* arbitrary limit */
+		if (uurb->number_of_packets < 1 ||
+		    uurb->number_of_packets > 128)
+			return -EINVAL;
+		if (!usb_endpoint_xfer_isoc(&ep->desc))
+			return -EINVAL;
+		number_of_packets = uurb->number_of_packets;
+		isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
+				   number_of_packets;
+		isopkt = memdup_user(iso_frame_desc, isofrmlen);
+		if (IS_ERR(isopkt)) {
+			ret = PTR_ERR(isopkt);
+			isopkt = NULL;
+			goto error;
+		}
+		for (totlen = u = 0; u < number_of_packets; u++) {
+			/*
+			 * arbitrary limit need for USB 3.1 Gen2
+			 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
+			 */
+			if (isopkt[u].length > 98304) {
+				ret = -EINVAL;
+				goto error;
+			}
+			totlen += isopkt[u].length;
+		}
+		u *= sizeof(struct usb_iso_packet_descriptor);
+		uurb->buffer_length = totlen;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (uurb->buffer_length > 0 &&
+			!access_ok(uurb->buffer, uurb->buffer_length)) {
+		ret = -EFAULT;
+		goto error;
+	}
+	as = alloc_async(number_of_packets);
+	if (!as) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	as->usbm = find_memory_area(ps, uurb);
+	if (IS_ERR(as->usbm)) {
+		ret = PTR_ERR(as->usbm);
+		as->usbm = NULL;
+		goto error;
+	}
+
+	/* do not use SG buffers when memory mapped segments
+	 * are in use
+	 */
+	if (as->usbm)
+		num_sgs = 0;
+
+	u += sizeof(struct async) + sizeof(struct urb) +
+	     (as->usbm ? 0 : uurb->buffer_length) +
+	     num_sgs * sizeof(struct scatterlist);
+	ret = usbfs_increase_memory_usage(u);
+	if (ret)
+		goto error;
+	as->mem_usage = u;
+
+	if (num_sgs) {
+		as->urb->sg = kmalloc_array(num_sgs,
+					    sizeof(struct scatterlist),
+					    GFP_KERNEL | __GFP_NOWARN);
+		if (!as->urb->sg) {
+			ret = -ENOMEM;
+			goto error;
+		}
+		as->urb->num_sgs = num_sgs;
+		sg_init_table(as->urb->sg, as->urb->num_sgs);
+
+		totlen = uurb->buffer_length;
+		for (i = 0; i < as->urb->num_sgs; i++) {
+			u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
+			buf = kmalloc(u, GFP_KERNEL);
+			if (!buf) {
+				ret = -ENOMEM;
+				goto error;
+			}
+			sg_set_buf(&as->urb->sg[i], buf, u);
+
+			if (!is_in) {
+				if (copy_from_user(buf, uurb->buffer, u)) {
+					ret = -EFAULT;
+					goto error;
+				}
+				uurb->buffer += u;
+			}
+			totlen -= u;
+		}
+	} else if (uurb->buffer_length > 0) {
+		if (as->usbm) {
+			unsigned long uurb_start = (unsigned long)uurb->buffer;
+
+			as->urb->transfer_buffer = as->usbm->mem +
+					(uurb_start - as->usbm->vm_start);
+		} else {
+			as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
+					GFP_KERNEL | __GFP_NOWARN);
+			if (!as->urb->transfer_buffer) {
+				ret = -ENOMEM;
+				goto error;
+			}
+			if (!is_in) {
+				if (copy_from_user(as->urb->transfer_buffer,
+						   uurb->buffer,
+						   uurb->buffer_length)) {
+					ret = -EFAULT;
+					goto error;
+				}
+			} else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
+				/*
+				 * Isochronous input data may end up being
+				 * discontiguous if some of the packets are
+				 * short. Clear the buffer so that the gaps
+				 * don't leak kernel data to userspace.
+				 */
+				memset(as->urb->transfer_buffer, 0,
+						uurb->buffer_length);
+			}
+		}
+	}
+	as->urb->dev = ps->dev;
+	as->urb->pipe = (uurb->type << 30) |
+			__create_pipe(ps->dev, uurb->endpoint & 0xf) |
+			(uurb->endpoint & USB_DIR_IN);
+
+	/* This tedious sequence is necessary because the URB_* flags
+	 * are internal to the kernel and subject to change, whereas
+	 * the USBDEVFS_URB_* flags are a user API and must not be changed.
+	 */
+	u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
+	if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
+		u |= URB_ISO_ASAP;
+	if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
+		u |= URB_SHORT_NOT_OK;
+	if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
+		u |= URB_ZERO_PACKET;
+	if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
+		u |= URB_NO_INTERRUPT;
+	as->urb->transfer_flags = u;
+
+	if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
+		dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
+	if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
+		dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
+
+	as->urb->transfer_buffer_length = uurb->buffer_length;
+	as->urb->setup_packet = (unsigned char *)dr;
+	dr = NULL;
+	as->urb->start_frame = uurb->start_frame;
+	as->urb->number_of_packets = number_of_packets;
+	as->urb->stream_id = stream_id;
+
+	if (ep->desc.bInterval) {
+		if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
+				ps->dev->speed == USB_SPEED_HIGH ||
+				ps->dev->speed >= USB_SPEED_SUPER)
+			as->urb->interval = 1 <<
+					min(15, ep->desc.bInterval - 1);
+		else
+			as->urb->interval = ep->desc.bInterval;
+	}
+
+	as->urb->context = as;
+	as->urb->complete = async_completed;
+	for (totlen = u = 0; u < number_of_packets; u++) {
+		as->urb->iso_frame_desc[u].offset = totlen;
+		as->urb->iso_frame_desc[u].length = isopkt[u].length;
+		totlen += isopkt[u].length;
+	}
+	kfree(isopkt);
+	isopkt = NULL;
+	as->ps = ps;
+	as->userurb = arg;
+	as->userurb_sigval = userurb_sigval;
+	if (as->usbm) {
+		unsigned long uurb_start = (unsigned long)uurb->buffer;
+
+		as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+		as->urb->transfer_dma = as->usbm->dma_handle +
+				(uurb_start - as->usbm->vm_start);
+	} else if (is_in && uurb->buffer_length > 0)
+		as->userbuffer = uurb->buffer;
+	as->signr = uurb->signr;
+	as->ifnum = ifnum;
+	as->pid = get_pid(task_pid(current));
+	as->cred = get_current_cred();
+	snoop_urb(ps->dev, as->userurb, as->urb->pipe,
+			as->urb->transfer_buffer_length, 0, SUBMIT,
+			NULL, 0);
+	if (!is_in)
+		snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
+
+	async_newpending(as);
+
+	if (usb_endpoint_xfer_bulk(&ep->desc)) {
+		spin_lock_irq(&ps->lock);
+
+		/* Not exactly the endpoint address; the direction bit is
+		 * shifted to the 0x10 position so that the value will be
+		 * between 0 and 31.
+		 */
+		as->bulk_addr = usb_endpoint_num(&ep->desc) |
+			((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+				>> 3);
+
+		/* If this bulk URB is the start of a new transfer, re-enable
+		 * the endpoint.  Otherwise mark it as a continuation URB.
+		 */
+		if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
+			as->bulk_status = AS_CONTINUATION;
+		else
+			ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
+
+		/* Don't accept continuation URBs if the endpoint is
+		 * disabled because of an earlier error.
+		 */
+		if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
+			ret = -EREMOTEIO;
+		else
+			ret = usb_submit_urb(as->urb, GFP_ATOMIC);
+		spin_unlock_irq(&ps->lock);
+	} else {
+		ret = usb_submit_urb(as->urb, GFP_KERNEL);
+	}
+
+	if (ret) {
+		dev_printk(KERN_DEBUG, &ps->dev->dev,
+			   "usbfs: usb_submit_urb returned %d\n", ret);
+		snoop_urb(ps->dev, as->userurb, as->urb->pipe,
+				0, ret, COMPLETE, NULL, 0);
+		async_removepending(as);
+		goto error;
+	}
+	return 0;
+
+ error:
+	kfree(isopkt);
+	kfree(dr);
+	if (as)
+		free_async(as);
+	return ret;
+}
+
+static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_urb uurb;
+	sigval_t userurb_sigval;
+
+	if (copy_from_user(&uurb, arg, sizeof(uurb)))
+		return -EFAULT;
+
+	memset(&userurb_sigval, 0, sizeof(userurb_sigval));
+	userurb_sigval.sival_ptr = arg;
+
+	return proc_do_submiturb(ps, &uurb,
+			(((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
+			arg, userurb_sigval);
+}
+
+static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
+{
+	struct urb *urb;
+	struct async *as;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ps->lock, flags);
+	as = async_getpending(ps, arg);
+	if (!as) {
+		spin_unlock_irqrestore(&ps->lock, flags);
+		return -EINVAL;
+	}
+
+	urb = as->urb;
+	usb_get_urb(urb);
+	spin_unlock_irqrestore(&ps->lock, flags);
+
+	usb_kill_urb(urb);
+	usb_put_urb(urb);
+
+	return 0;
+}
+
+static void compute_isochronous_actual_length(struct urb *urb)
+{
+	unsigned int i;
+
+	if (urb->number_of_packets > 0) {
+		urb->actual_length = 0;
+		for (i = 0; i < urb->number_of_packets; i++)
+			urb->actual_length +=
+					urb->iso_frame_desc[i].actual_length;
+	}
+}
+
+static int processcompl(struct async *as, void __user * __user *arg)
+{
+	struct urb *urb = as->urb;
+	struct usbdevfs_urb __user *userurb = as->userurb;
+	void __user *addr = as->userurb;
+	unsigned int i;
+
+	compute_isochronous_actual_length(urb);
+	if (as->userbuffer && urb->actual_length) {
+		if (copy_urb_data_to_user(as->userbuffer, urb))
+			goto err_out;
+	}
+	if (put_user(as->status, &userurb->status))
+		goto err_out;
+	if (put_user(urb->actual_length, &userurb->actual_length))
+		goto err_out;
+	if (put_user(urb->error_count, &userurb->error_count))
+		goto err_out;
+
+	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
+		for (i = 0; i < urb->number_of_packets; i++) {
+			if (put_user(urb->iso_frame_desc[i].actual_length,
+				     &userurb->iso_frame_desc[i].actual_length))
+				goto err_out;
+			if (put_user(urb->iso_frame_desc[i].status,
+				     &userurb->iso_frame_desc[i].status))
+				goto err_out;
+		}
+	}
+
+	if (put_user(addr, (void __user * __user *)arg))
+		return -EFAULT;
+	return 0;
+
+err_out:
+	return -EFAULT;
+}
+
+static struct async *reap_as(struct usb_dev_state *ps)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct async *as = NULL;
+	struct usb_device *dev = ps->dev;
+
+	add_wait_queue(&ps->wait, &wait);
+	for (;;) {
+		__set_current_state(TASK_INTERRUPTIBLE);
+		as = async_getcompleted(ps);
+		if (as || !connected(ps))
+			break;
+		if (signal_pending(current))
+			break;
+		usb_unlock_device(dev);
+		schedule();
+		usb_lock_device(dev);
+	}
+	remove_wait_queue(&ps->wait, &wait);
+	set_current_state(TASK_RUNNING);
+	return as;
+}
+
+static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
+{
+	struct async *as = reap_as(ps);
+
+	if (as) {
+		int retval;
+
+		snoop(&ps->dev->dev, "reap %px\n", as->userurb);
+		retval = processcompl(as, (void __user * __user *)arg);
+		free_async(as);
+		return retval;
+	}
+	if (signal_pending(current))
+		return -EINTR;
+	return -ENODEV;
+}
+
+static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
+{
+	int retval;
+	struct async *as;
+
+	as = async_getcompleted(ps);
+	if (as) {
+		snoop(&ps->dev->dev, "reap %px\n", as->userurb);
+		retval = processcompl(as, (void __user * __user *)arg);
+		free_async(as);
+	} else {
+		retval = (connected(ps) ? -EAGAIN : -ENODEV);
+	}
+	return retval;
+}
+
+#ifdef CONFIG_COMPAT
+static int proc_control_compat(struct usb_dev_state *ps,
+				struct usbdevfs_ctrltransfer32 __user *p32)
+{
+	struct usbdevfs_ctrltransfer ctrl;
+	u32 udata;
+
+	if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
+	    get_user(udata, &p32->data))
+		return -EFAULT;
+	ctrl.data = compat_ptr(udata);
+	return do_proc_control(ps, &ctrl);
+}
+
+static int proc_bulk_compat(struct usb_dev_state *ps,
+			struct usbdevfs_bulktransfer32 __user *p32)
+{
+	struct usbdevfs_bulktransfer bulk;
+	compat_caddr_t addr;
+
+	if (get_user(bulk.ep, &p32->ep) ||
+	    get_user(bulk.len, &p32->len) ||
+	    get_user(bulk.timeout, &p32->timeout) ||
+	    get_user(addr, &p32->data))
+		return -EFAULT;
+	bulk.data = compat_ptr(addr);
+	return do_proc_bulk(ps, &bulk);
+}
+
+static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_disconnectsignal32 ds;
+
+	if (copy_from_user(&ds, arg, sizeof(ds)))
+		return -EFAULT;
+	ps->discsignr = ds.signr;
+	ps->disccontext.sival_int = ds.context;
+	return 0;
+}
+
+static int get_urb32(struct usbdevfs_urb *kurb,
+		     struct usbdevfs_urb32 __user *uurb)
+{
+	struct usbdevfs_urb32 urb32;
+	if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
+		return -EFAULT;
+	kurb->type = urb32.type;
+	kurb->endpoint = urb32.endpoint;
+	kurb->status = urb32.status;
+	kurb->flags = urb32.flags;
+	kurb->buffer = compat_ptr(urb32.buffer);
+	kurb->buffer_length = urb32.buffer_length;
+	kurb->actual_length = urb32.actual_length;
+	kurb->start_frame = urb32.start_frame;
+	kurb->number_of_packets = urb32.number_of_packets;
+	kurb->error_count = urb32.error_count;
+	kurb->signr = urb32.signr;
+	kurb->usercontext = compat_ptr(urb32.usercontext);
+	return 0;
+}
+
+static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_urb uurb;
+	sigval_t userurb_sigval;
+
+	if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
+		return -EFAULT;
+
+	memset(&userurb_sigval, 0, sizeof(userurb_sigval));
+	userurb_sigval.sival_int = ptr_to_compat(arg);
+
+	return proc_do_submiturb(ps, &uurb,
+			((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
+			arg, userurb_sigval);
+}
+
+static int processcompl_compat(struct async *as, void __user * __user *arg)
+{
+	struct urb *urb = as->urb;
+	struct usbdevfs_urb32 __user *userurb = as->userurb;
+	void __user *addr = as->userurb;
+	unsigned int i;
+
+	compute_isochronous_actual_length(urb);
+	if (as->userbuffer && urb->actual_length) {
+		if (copy_urb_data_to_user(as->userbuffer, urb))
+			return -EFAULT;
+	}
+	if (put_user(as->status, &userurb->status))
+		return -EFAULT;
+	if (put_user(urb->actual_length, &userurb->actual_length))
+		return -EFAULT;
+	if (put_user(urb->error_count, &userurb->error_count))
+		return -EFAULT;
+
+	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
+		for (i = 0; i < urb->number_of_packets; i++) {
+			if (put_user(urb->iso_frame_desc[i].actual_length,
+				     &userurb->iso_frame_desc[i].actual_length))
+				return -EFAULT;
+			if (put_user(urb->iso_frame_desc[i].status,
+				     &userurb->iso_frame_desc[i].status))
+				return -EFAULT;
+		}
+	}
+
+	if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
+		return -EFAULT;
+	return 0;
+}
+
+static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
+{
+	struct async *as = reap_as(ps);
+
+	if (as) {
+		int retval;
+
+		snoop(&ps->dev->dev, "reap %px\n", as->userurb);
+		retval = processcompl_compat(as, (void __user * __user *)arg);
+		free_async(as);
+		return retval;
+	}
+	if (signal_pending(current))
+		return -EINTR;
+	return -ENODEV;
+}
+
+static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
+{
+	int retval;
+	struct async *as;
+
+	as = async_getcompleted(ps);
+	if (as) {
+		snoop(&ps->dev->dev, "reap %px\n", as->userurb);
+		retval = processcompl_compat(as, (void __user * __user *)arg);
+		free_async(as);
+	} else {
+		retval = (connected(ps) ? -EAGAIN : -ENODEV);
+	}
+	return retval;
+}
+
+
+#endif
+
+static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_disconnectsignal ds;
+
+	if (copy_from_user(&ds, arg, sizeof(ds)))
+		return -EFAULT;
+	ps->discsignr = ds.signr;
+	ps->disccontext.sival_ptr = ds.context;
+	return 0;
+}
+
+static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned int ifnum;
+
+	if (get_user(ifnum, (unsigned int __user *)arg))
+		return -EFAULT;
+	return claimintf(ps, ifnum);
+}
+
+static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned int ifnum;
+	int ret;
+
+	if (get_user(ifnum, (unsigned int __user *)arg))
+		return -EFAULT;
+	ret = releaseintf(ps, ifnum);
+	if (ret < 0)
+		return ret;
+	destroy_async_on_interface(ps, ifnum);
+	return 0;
+}
+
+static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
+{
+	int			size;
+	void			*buf = NULL;
+	int			retval = 0;
+	struct usb_interface    *intf = NULL;
+	struct usb_driver       *driver = NULL;
+
+	if (ps->privileges_dropped)
+		return -EACCES;
+
+	if (!connected(ps))
+		return -ENODEV;
+
+	/* alloc buffer */
+	size = _IOC_SIZE(ctl->ioctl_code);
+	if (size > 0) {
+		buf = kmalloc(size, GFP_KERNEL);
+		if (buf == NULL)
+			return -ENOMEM;
+		if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
+			if (copy_from_user(buf, ctl->data, size)) {
+				kfree(buf);
+				return -EFAULT;
+			}
+		} else {
+			memset(buf, 0, size);
+		}
+	}
+
+	if (ps->dev->state != USB_STATE_CONFIGURED)
+		retval = -EHOSTUNREACH;
+	else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
+		retval = -EINVAL;
+	else switch (ctl->ioctl_code) {
+
+	/* disconnect kernel driver from interface */
+	case USBDEVFS_DISCONNECT:
+		if (intf->dev.driver) {
+			driver = to_usb_driver(intf->dev.driver);
+			dev_dbg(&intf->dev, "disconnect by usbfs\n");
+			usb_driver_release_interface(driver, intf);
+		} else
+			retval = -ENODATA;
+		break;
+
+	/* let kernel drivers try to (re)bind to the interface */
+	case USBDEVFS_CONNECT:
+		if (!intf->dev.driver)
+			retval = device_attach(&intf->dev);
+		else
+			retval = -EBUSY;
+		break;
+
+	/* talk directly to the interface's driver */
+	default:
+		if (intf->dev.driver)
+			driver = to_usb_driver(intf->dev.driver);
+		if (driver == NULL || driver->unlocked_ioctl == NULL) {
+			retval = -ENOTTY;
+		} else {
+			retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
+			if (retval == -ENOIOCTLCMD)
+				retval = -ENOTTY;
+		}
+	}
+
+	/* cleanup and return */
+	if (retval >= 0
+			&& (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
+			&& size > 0
+			&& copy_to_user(ctl->data, buf, size) != 0)
+		retval = -EFAULT;
+
+	kfree(buf);
+	return retval;
+}
+
+static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_ioctl	ctrl;
+
+	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
+		return -EFAULT;
+	return proc_ioctl(ps, &ctrl);
+}
+
+#ifdef CONFIG_COMPAT
+static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
+{
+	struct usbdevfs_ioctl32 ioc32;
+	struct usbdevfs_ioctl ctrl;
+
+	if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
+		return -EFAULT;
+	ctrl.ifno = ioc32.ifno;
+	ctrl.ioctl_code = ioc32.ioctl_code;
+	ctrl.data = compat_ptr(ioc32.data);
+	return proc_ioctl(ps, &ctrl);
+}
+#endif
+
+static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned portnum;
+	int rc;
+
+	if (get_user(portnum, (unsigned __user *) arg))
+		return -EFAULT;
+	rc = usb_hub_claim_port(ps->dev, portnum, ps);
+	if (rc == 0)
+		snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
+			portnum, task_pid_nr(current), current->comm);
+	return rc;
+}
+
+static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned portnum;
+
+	if (get_user(portnum, (unsigned __user *) arg))
+		return -EFAULT;
+	return usb_hub_release_port(ps->dev, portnum, ps);
+}
+
+static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
+{
+	__u32 caps;
+
+	caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
+			USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
+			USBDEVFS_CAP_DROP_PRIVILEGES |
+			USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
+	if (!ps->dev->bus->no_stop_on_short)
+		caps |= USBDEVFS_CAP_BULK_CONTINUATION;
+	if (ps->dev->bus->sg_tablesize)
+		caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
+
+	if (put_user(caps, (__u32 __user *)arg))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
+{
+	struct usbdevfs_disconnect_claim dc;
+	struct usb_interface *intf;
+
+	if (copy_from_user(&dc, arg, sizeof(dc)))
+		return -EFAULT;
+
+	intf = usb_ifnum_to_if(ps->dev, dc.interface);
+	if (!intf)
+		return -EINVAL;
+
+	if (intf->dev.driver) {
+		struct usb_driver *driver = to_usb_driver(intf->dev.driver);
+
+		if (ps->privileges_dropped)
+			return -EACCES;
+
+		if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
+				strncmp(dc.driver, intf->dev.driver->name,
+					sizeof(dc.driver)) != 0)
+			return -EBUSY;
+
+		if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
+				strncmp(dc.driver, intf->dev.driver->name,
+					sizeof(dc.driver)) == 0)
+			return -EBUSY;
+
+		dev_dbg(&intf->dev, "disconnect by usbfs\n");
+		usb_driver_release_interface(driver, intf);
+	}
+
+	return claimintf(ps, dc.interface);
+}
+
+static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned num_streams, num_eps;
+	struct usb_host_endpoint **eps;
+	struct usb_interface *intf;
+	int r;
+
+	r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
+				   &eps, &intf);
+	if (r)
+		return r;
+
+	destroy_async_on_interface(ps,
+				   intf->altsetting[0].desc.bInterfaceNumber);
+
+	r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
+	kfree(eps);
+	return r;
+}
+
+static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
+{
+	unsigned num_eps;
+	struct usb_host_endpoint **eps;
+	struct usb_interface *intf;
+	int r;
+
+	r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
+	if (r)
+		return r;
+
+	destroy_async_on_interface(ps,
+				   intf->altsetting[0].desc.bInterfaceNumber);
+
+	r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
+	kfree(eps);
+	return r;
+}
+
+static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
+{
+	u32 data;
+
+	if (copy_from_user(&data, arg, sizeof(data)))
+		return -EFAULT;
+
+	/* This is a one way operation. Once privileges are
+	 * dropped, you cannot regain them. You may however reissue
+	 * this ioctl to shrink the allowed interfaces mask.
+	 */
+	ps->interface_allowed_mask &= data;
+	ps->privileges_dropped = true;
+
+	return 0;
+}
+
+static int proc_forbid_suspend(struct usb_dev_state *ps)
+{
+	int ret = 0;
+
+	if (ps->suspend_allowed) {
+		ret = usb_autoresume_device(ps->dev);
+		if (ret == 0)
+			ps->suspend_allowed = false;
+		else if (ret != -ENODEV)
+			ret = -EIO;
+	}
+	return ret;
+}
+
+static int proc_allow_suspend(struct usb_dev_state *ps)
+{
+	if (!connected(ps))
+		return -ENODEV;
+
+	WRITE_ONCE(ps->not_yet_resumed, 1);
+	if (!ps->suspend_allowed) {
+		usb_autosuspend_device(ps->dev);
+		ps->suspend_allowed = true;
+	}
+	return 0;
+}
+
+static int proc_wait_for_resume(struct usb_dev_state *ps)
+{
+	int ret;
+
+	usb_unlock_device(ps->dev);
+	ret = wait_event_interruptible(ps->wait_for_resume,
+			READ_ONCE(ps->not_yet_resumed) == 0);
+	usb_lock_device(ps->dev);
+
+	if (ret != 0)
+		return -EINTR;
+	return proc_forbid_suspend(ps);
+}
+
+/*
+ * NOTE:  All requests here that have interface numbers as parameters
+ * are assuming that somehow the configuration has been prevented from
+ * changing.  But there's no mechanism to ensure that...
+ */
+static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
+				void __user *p)
+{
+	struct usb_dev_state *ps = file->private_data;
+	struct inode *inode = file_inode(file);
+	struct usb_device *dev = ps->dev;
+	int ret = -ENOTTY;
+
+	if (!(file->f_mode & FMODE_WRITE))
+		return -EPERM;
+
+	usb_lock_device(dev);
+
+	/* Reap operations are allowed even after disconnection */
+	switch (cmd) {
+	case USBDEVFS_REAPURB:
+		snoop(&dev->dev, "%s: REAPURB\n", __func__);
+		ret = proc_reapurb(ps, p);
+		goto done;
+
+	case USBDEVFS_REAPURBNDELAY:
+		snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
+		ret = proc_reapurbnonblock(ps, p);
+		goto done;
+
+#ifdef CONFIG_COMPAT
+	case USBDEVFS_REAPURB32:
+		snoop(&dev->dev, "%s: REAPURB32\n", __func__);
+		ret = proc_reapurb_compat(ps, p);
+		goto done;
+
+	case USBDEVFS_REAPURBNDELAY32:
+		snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
+		ret = proc_reapurbnonblock_compat(ps, p);
+		goto done;
+#endif
+	}
+
+	if (!connected(ps)) {
+		usb_unlock_device(dev);
+		return -ENODEV;
+	}
+
+	switch (cmd) {
+	case USBDEVFS_CONTROL:
+		snoop(&dev->dev, "%s: CONTROL\n", __func__);
+		ret = proc_control(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+	case USBDEVFS_BULK:
+		snoop(&dev->dev, "%s: BULK\n", __func__);
+		ret = proc_bulk(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+	case USBDEVFS_RESETEP:
+		snoop(&dev->dev, "%s: RESETEP\n", __func__);
+		ret = proc_resetep(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+	case USBDEVFS_RESET:
+		snoop(&dev->dev, "%s: RESET\n", __func__);
+		ret = proc_resetdevice(ps);
+		break;
+
+	case USBDEVFS_CLEAR_HALT:
+		snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
+		ret = proc_clearhalt(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+	case USBDEVFS_GETDRIVER:
+		snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
+		ret = proc_getdriver(ps, p);
+		break;
+
+	case USBDEVFS_CONNECTINFO:
+		snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
+		ret = proc_connectinfo(ps, p);
+		break;
+
+	case USBDEVFS_SETINTERFACE:
+		snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
+		ret = proc_setintf(ps, p);
+		break;
+
+	case USBDEVFS_SETCONFIGURATION:
+		snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
+		ret = proc_setconfig(ps, p);
+		break;
+
+	case USBDEVFS_SUBMITURB:
+		snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
+		ret = proc_submiturb(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+#ifdef CONFIG_COMPAT
+	case USBDEVFS_CONTROL32:
+		snoop(&dev->dev, "%s: CONTROL32\n", __func__);
+		ret = proc_control_compat(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+	case USBDEVFS_BULK32:
+		snoop(&dev->dev, "%s: BULK32\n", __func__);
+		ret = proc_bulk_compat(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+	case USBDEVFS_DISCSIGNAL32:
+		snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
+		ret = proc_disconnectsignal_compat(ps, p);
+		break;
+
+	case USBDEVFS_SUBMITURB32:
+		snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
+		ret = proc_submiturb_compat(ps, p);
+		if (ret >= 0)
+			inode->i_mtime = inode_set_ctime_current(inode);
+		break;
+
+	case USBDEVFS_IOCTL32:
+		snoop(&dev->dev, "%s: IOCTL32\n", __func__);
+		ret = proc_ioctl_compat(ps, ptr_to_compat(p));
+		break;
+#endif
+
+	case USBDEVFS_DISCARDURB:
+		snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
+		ret = proc_unlinkurb(ps, p);
+		break;
+
+	case USBDEVFS_DISCSIGNAL:
+		snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
+		ret = proc_disconnectsignal(ps, p);
+		break;
+
+	case USBDEVFS_CLAIMINTERFACE:
+		snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
+		ret = proc_claiminterface(ps, p);
+		break;
+
+	case USBDEVFS_RELEASEINTERFACE:
+		snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
+		ret = proc_releaseinterface(ps, p);
+		break;
+
+	case USBDEVFS_IOCTL:
+		snoop(&dev->dev, "%s: IOCTL\n", __func__);
+		ret = proc_ioctl_default(ps, p);
+		break;
+
+	case USBDEVFS_CLAIM_PORT:
+		snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
+		ret = proc_claim_port(ps, p);
+		break;
+
+	case USBDEVFS_RELEASE_PORT:
+		snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
+		ret = proc_release_port(ps, p);
+		break;
+	case USBDEVFS_GET_CAPABILITIES:
+		ret = proc_get_capabilities(ps, p);
+		break;
+	case USBDEVFS_DISCONNECT_CLAIM:
+		ret = proc_disconnect_claim(ps, p);
+		break;
+	case USBDEVFS_ALLOC_STREAMS:
+		ret = proc_alloc_streams(ps, p);
+		break;
+	case USBDEVFS_FREE_STREAMS:
+		ret = proc_free_streams(ps, p);
+		break;
+	case USBDEVFS_DROP_PRIVILEGES:
+		ret = proc_drop_privileges(ps, p);
+		break;
+	case USBDEVFS_GET_SPEED:
+		ret = ps->dev->speed;
+		break;
+	case USBDEVFS_FORBID_SUSPEND:
+		ret = proc_forbid_suspend(ps);
+		break;
+	case USBDEVFS_ALLOW_SUSPEND:
+		ret = proc_allow_suspend(ps);
+		break;
+	case USBDEVFS_WAIT_FOR_RESUME:
+		ret = proc_wait_for_resume(ps);
+		break;
+	}
+
+	/* Handle variable-length commands */
+	switch (cmd & ~IOCSIZE_MASK) {
+	case USBDEVFS_CONNINFO_EX(0):
+		ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
+		break;
+	}
+
+ done:
+	usb_unlock_device(dev);
+	if (ret >= 0)
+		inode->i_atime = current_time(inode);
+	return ret;
+}
+
+static long usbdev_ioctl(struct file *file, unsigned int cmd,
+			unsigned long arg)
+{
+	int ret;
+
+	ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
+
+	return ret;
+}
+
+/* No kernel lock - fine */
+static __poll_t usbdev_poll(struct file *file,
+				struct poll_table_struct *wait)
+{
+	struct usb_dev_state *ps = file->private_data;
+	__poll_t mask = 0;
+
+	poll_wait(file, &ps->wait, wait);
+	if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
+		mask |= EPOLLOUT | EPOLLWRNORM;
+	if (!connected(ps))
+		mask |= EPOLLHUP;
+	if (list_empty(&ps->list))
+		mask |= EPOLLERR;
+	return mask;
+}
+
+const struct file_operations usbdev_file_operations = {
+	.owner =	  THIS_MODULE,
+	.llseek =	  no_seek_end_llseek,
+	.read =		  usbdev_read,
+	.poll =		  usbdev_poll,
+	.unlocked_ioctl = usbdev_ioctl,
+	.compat_ioctl =   compat_ptr_ioctl,
+	.mmap =           usbdev_mmap,
+	.open =		  usbdev_open,
+	.release =	  usbdev_release,
+};
+
+static void usbdev_remove(struct usb_device *udev)
+{
+	struct usb_dev_state *ps;
+
+	/* Protect against simultaneous resume */
+	mutex_lock(&usbfs_mutex);
+	while (!list_empty(&udev->filelist)) {
+		ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
+		destroy_all_async(ps);
+		wake_up_all(&ps->wait);
+		WRITE_ONCE(ps->not_yet_resumed, 0);
+		wake_up_all(&ps->wait_for_resume);
+		list_del_init(&ps->list);
+		if (ps->discsignr)
+			kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
+					     ps->disc_pid, ps->cred);
+	}
+	mutex_unlock(&usbfs_mutex);
+}
+
+static int usbdev_notify(struct notifier_block *self,
+			       unsigned long action, void *dev)
+{
+	switch (action) {
+	case USB_DEVICE_ADD:
+		break;
+	case USB_DEVICE_REMOVE:
+		usbdev_remove(dev);
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block usbdev_nb = {
+	.notifier_call =	usbdev_notify,
+};
+
+static struct cdev usb_device_cdev;
+
+int __init usb_devio_init(void)
+{
+	int retval;
+
+	retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
+					"usb_device");
+	if (retval) {
+		printk(KERN_ERR "Unable to register minors for usb_device\n");
+		goto out;
+	}
+	cdev_init(&usb_device_cdev, &usbdev_file_operations);
+	retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
+	if (retval) {
+		printk(KERN_ERR "Unable to get usb_device major %d\n",
+		       USB_DEVICE_MAJOR);
+		goto error_cdev;
+	}
+	usb_register_notify(&usbdev_nb);
+out:
+	return retval;
+
+error_cdev:
+	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+	goto out;
+}
+
+void usb_devio_cleanup(void)
+{
+	usb_unregister_notify(&usbdev_nb);
+	cdev_del(&usb_device_cdev);
+	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
+}