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-rw-r--r--drivers/usb/core/devio.c2921
1 files changed, 2921 insertions, 0 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
new file mode 100644
index 000000000..4184cd65a
--- /dev/null
+++ b/drivers/usb/core/devio.c
@@ -0,0 +1,2921 @@
+// 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;
+ }
+ }
+
+ vma->vm_flags |= VM_IO;
+ vma->vm_flags |= (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 = current_time(inode);
+ break;
+
+ case USBDEVFS_BULK:
+ snoop(&dev->dev, "%s: BULK\n", __func__);
+ ret = proc_bulk(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = current_time(inode);
+ break;
+
+ case USBDEVFS_RESETEP:
+ snoop(&dev->dev, "%s: RESETEP\n", __func__);
+ ret = proc_resetep(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = current_time(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 = current_time(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 = current_time(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 = current_time(inode);
+ break;
+
+ case USBDEVFS_BULK32:
+ snoop(&dev->dev, "%s: BULK32\n", __func__);
+ ret = proc_bulk_compat(ps, p);
+ if (ret >= 0)
+ inode->i_mtime = current_time(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 = current_time(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);
+}