| // 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/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 atomic64_t 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; |
| |
| lim = READ_ONCE(usbfs_memory_mb); |
| lim <<= 20; |
| |
| atomic64_add(amount, &usbfs_memory_usage); |
| |
| if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) { |
| atomic64_sub(amount, &usbfs_memory_usage); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| /* Memory for a transfer is being deallocated */ |
| static void usbfs_decrease_memory_usage(u64 amount) |
| { |
| atomic64_sub(amount, &usbfs_memory_usage); |
| } |
| |
| 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; |
| 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); |
| |
| usb_free_coherent(ps->dev, 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; |
| 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 = usb_alloc_coherent(ps->dev, 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); |
| |
| if (hcd->localmem_pool || !hcd_uses_dma(hcd)) { |
| 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; |
| } |
| |
| /* 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); |
| } |
| |
| 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 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 wLength; |
| int i, pipe, ret; |
| |
| 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; |
| tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); |
| if (!tbuf) { |
| ret = -ENOMEM; |
| goto done; |
| } |
| 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) && ctrl->wLength) { |
| pipe = usb_rcvctrlpipe(dev, 0); |
| snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, NULL, 0); |
| |
| usb_unlock_device(dev); |
| i = usb_control_msg(dev, pipe, ctrl->bRequest, |
| ctrl->bRequestType, ctrl->wValue, ctrl->wIndex, |
| tbuf, ctrl->wLength, tmo); |
| usb_lock_device(dev); |
| snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, |
| tbuf, max(i, 0)); |
| if ((i > 0) && ctrl->wLength) { |
| if (copy_to_user(ctrl->data, tbuf, i)) { |
| ret = -EFAULT; |
| goto done; |
| } |
| } |
| } else { |
| if (ctrl->wLength) { |
| if (copy_from_user(tbuf, ctrl->data, ctrl->wLength)) { |
| ret = -EFAULT; |
| goto done; |
| } |
| } |
| pipe = usb_sndctrlpipe(dev, 0); |
| snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, |
| tbuf, ctrl->wLength); |
| |
| usb_unlock_device(dev); |
| i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl->bRequest, |
| ctrl->bRequestType, ctrl->wValue, ctrl->wIndex, |
| tbuf, ctrl->wLength, tmo); |
| usb_lock_device(dev); |
| snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), 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; |
| done: |
| 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, pipe; |
| int len2; |
| unsigned char *tbuf; |
| int i, ret; |
| |
| ret = findintfep(ps->dev, bulk->ep); |
| if (ret < 0) |
| return ret; |
| ret = checkintf(ps, ret); |
| if (ret) |
| return ret; |
| if (bulk->ep & USB_DIR_IN) |
| pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f); |
| else |
| pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f); |
| if (!usb_maxpacket(dev, pipe, !(bulk->ep & USB_DIR_IN))) |
| return -EINVAL; |
| len1 = bulk->len; |
| if (len1 >= (INT_MAX - sizeof(struct urb))) |
| 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. |
| */ |
| tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN); |
| if (!tbuf) { |
| ret = -ENOMEM; |
| goto done; |
| } |
| tmo = bulk->timeout; |
| if (bulk->ep & 0x80) { |
| snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0); |
| |
| usb_unlock_device(dev); |
| i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); |
| 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 = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); |
| usb_lock_device(dev); |
| snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0); |
| } |
| ret = (i < 0 ? i : len2); |
| done: |
| 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); |
| } |