#include <linux/module.h> #include <linux/string.h> #include <linux/bitops.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/log2.h> #include <linux/usb.h> #include <linux/wait.h> #include "hcd.h" #define to_urb(d) container_of(d, struct urb, kref) static void urb_destroy(struct kref *kref) { struct urb *urb = to_urb(kref); if (urb->transfer_flags & URB_FREE_BUFFER) kfree(urb->transfer_buffer); kfree(urb); } /** * usb_init_urb - initializes a urb so that it can be used by a USB driver * @urb: pointer to the urb to initialize * * Initializes a urb so that the USB subsystem can use it properly. * * If a urb is created with a call to usb_alloc_urb() it is not * necessary to call this function. Only use this if you allocate the * space for a struct urb on your own. If you call this function, be * careful when freeing the memory for your urb that it is no longer in * use by the USB core. * * Only use this function if you _really_ understand what you are doing. */ void usb_init_urb(struct urb *urb) { if (urb) { memset(urb, 0, sizeof(*urb)); kref_init(&urb->kref); INIT_LIST_HEAD(&urb->anchor_list); } } EXPORT_SYMBOL_GPL(usb_init_urb); /** * usb_alloc_urb - creates a new urb for a USB driver to use * @iso_packets: number of iso packets for this urb * @mem_flags: the type of memory to allocate, see kmalloc() for a list of * valid options for this. * * Creates an urb for the USB driver to use, initializes a few internal * structures, incrementes the usage counter, and returns a pointer to it. * * If no memory is available, NULL is returned. * * If the driver want to use this urb for interrupt, control, or bulk * endpoints, pass '0' as the number of iso packets. * * The driver must call usb_free_urb() when it is finished with the urb. */ struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags) { struct urb *urb; urb = kmalloc(sizeof(struct urb) + iso_packets * sizeof(struct usb_iso_packet_descriptor), mem_flags); if (!urb) { printk(KERN_ERR "alloc_urb: kmalloc failed\n"); return NULL; } usb_init_urb(urb); return urb; } EXPORT_SYMBOL_GPL(usb_alloc_urb); /** * usb_free_urb - frees the memory used by a urb when all users of it are finished * @urb: pointer to the urb to free, may be NULL * * Must be called when a user of a urb is finished with it. When the last user * of the urb calls this function, the memory of the urb is freed. * * Note: The transfer buffer associated with the urb is not freed unless the * URB_FREE_BUFFER transfer flag is set. */ void usb_free_urb(struct urb *urb) { if (urb) kref_put(&urb->kref, urb_destroy); } EXPORT_SYMBOL_GPL(usb_free_urb); /** * usb_get_urb - increments the reference count of the urb * @urb: pointer to the urb to modify, may be NULL * * This must be called whenever a urb is transferred from a device driver to a * host controller driver. This allows proper reference counting to happen * for urbs. * * A pointer to the urb with the incremented reference counter is returned. */ struct urb *usb_get_urb(struct urb *urb) { if (urb) kref_get(&urb->kref); return urb; } EXPORT_SYMBOL_GPL(usb_get_urb); /** * usb_anchor_urb - anchors an URB while it is processed * @urb: pointer to the urb to anchor * @anchor: pointer to the anchor * * This can be called to have access to URBs which are to be executed * without bothering to track them */ void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor) { unsigned long flags; spin_lock_irqsave(&anchor->lock, flags); usb_get_urb(urb); list_add_tail(&urb->anchor_list, &anchor->urb_list); urb->anchor = anchor; if (unlikely(anchor->poisoned)) { atomic_inc(&urb->reject); } spin_unlock_irqrestore(&anchor->lock, flags); } EXPORT_SYMBOL_GPL(usb_anchor_urb); /** * usb_unanchor_urb - unanchors an URB * @urb: pointer to the urb to anchor * * Call this to stop the system keeping track of this URB */ void usb_unanchor_urb(struct urb *urb) { unsigned long flags; struct usb_anchor *anchor; if (!urb) return; anchor = urb->anchor; if (!anchor) return; spin_lock_irqsave(&anchor->lock, flags); if (unlikely(anchor != urb->anchor)) { /* we've lost the race to another thread */ spin_unlock_irqrestore(&anchor->lock, flags); return; } urb->anchor = NULL; list_del(&urb->anchor_list); spin_unlock_irqrestore(&anchor->lock, flags); usb_put_urb(urb); if (list_empty(&anchor->urb_list)) wake_up(&anchor->wait); } EXPORT_SYMBOL_GPL(usb_unanchor_urb); /*-------------------------------------------------------------------*/ /** * usb_submit_urb - issue an asynchronous transfer request for an endpoint * @urb: pointer to the urb describing the request * @mem_flags: the type of memory to allocate, see kmalloc() for a list * of valid options for this. * * This submits a transfer request, and transfers control of the URB * describing that request to the USB subsystem. Request completion will * be indicated later, asynchronously, by calling the completion handler. * The three types of completion are success, error, and unlink * (a software-induced fault, also called "request cancellation"). * * URBs may be submitted in interrupt context. * * The caller must have correctly initialized the URB before submitting * it. Functions such as usb_fill_bulk_urb() and usb_fill_control_urb() are * available to ensure that most fields are correctly initialized, for * the particular kind of transfer, although they will not initialize * any transfer flags. * * Successful submissions return 0; otherwise this routine returns a * negative error number. If the submission is successful, the complete() * callback from the URB will be called exactly once, when the USB core and * Host Controller Driver (HCD) are finished with the URB. When the completion * function is called, control of the URB is returned to the device * driver which issued the request. The completion handler may then * immediately free or reuse that URB. * * With few exceptions, USB device drivers should never access URB fields * provided by usbcore or the HCD until its complete() is called. * The exceptions relate to periodic transfer scheduling. For both * interrupt and isochronous urbs, as part of successful URB submission * urb->interval is modified to reflect the actual transfer period used * (normally some power of two units). And for isochronous urbs, * urb->start_frame is modified to reflect when the URB's transfers were * scheduled to start. Not all isochronous transfer scheduling policies * will work, but most host controller drivers should easily handle ISO * queues going from now until 10-200 msec into the future. * * For control endpoints, the synchronous usb_control_msg() call is * often used (in non-interrupt context) instead of this call. * That is often used through convenience wrappers, for the requests * that are standardized in the USB 2.0 specification. For bulk * endpoints, a synchronous usb_bulk_msg() call is available. * * Request Queuing: * * URBs may be submitted to endpoints before previous ones complete, to * minimize the impact of interrupt latencies and system overhead on data * throughput. With that queuing policy, an endpoint's queue would never * be empty. This is required for continuous isochronous data streams, * and may also be required for some kinds of interrupt transfers. Such * queuing also maximizes bandwidth utilization by letting USB controllers * start work on later requests before driver software has finished the * completion processing for earlier (successful) requests. * * As of Linux 2.6, all USB endpoint transfer queues support depths greater * than one. This was previously a HCD-specific behavior, except for ISO * transfers. Non-isochronous endpoint queues are inactive during cleanup * after faults (transfer errors or cancellation). * * Reserved Bandwidth Transfers: * * Periodic transfers (interrupt or isochronous) are performed repeatedly, * using the interval specified in the urb. Submitting the first urb to * the endpoint reserves the bandwidth necessary to make those transfers. * If the USB subsystem can't allocate sufficient bandwidth to perform * the periodic request, submitting such a periodic request should fail. * * For devices under xHCI, the bandwidth is reserved at configuration time, or * when the alt setting is selected. If there is not enough bus bandwidth, the * configuration/alt setting request will fail. Therefore, submissions to * periodic endpoints on devices under xHCI should never fail due to bandwidth * constraints. * * Device drivers must explicitly request that repetition, by ensuring that * some URB is always on the endpoint's queue (except possibly for short * periods during completion callacks). When there is no longer an urb * queued, the endpoint's bandwidth reservation is canceled. This means * drivers can use their completion handlers to ensure they keep bandwidth * they need, by reinitializing and resubmitting the just-completed urb * until the driver longer needs that periodic bandwidth. * * Memory Flags: * * The general rules for how to decide which mem_flags to use * are the same as for kmalloc. There are four * different possible values; GFP_KERNEL, GFP_NOFS, GFP_NOIO and * GFP_ATOMIC. * * GFP_NOFS is not ever used, as it has not been implemented yet. * * GFP_ATOMIC is used when * (a) you are inside a completion handler, an interrupt, bottom half, * tasklet or timer, or * (b) you are holding a spinlock or rwlock (does not apply to * semaphores), or * (c) current->state != TASK_RUNNING, this is the case only after * you've changed it. * * GFP_NOIO is used in the block io path and error handling of storage * devices. * * All other situations use GFP_KERNEL. * * Some more specific rules for mem_flags can be inferred, such as * (1) start_xmit, timeout, and receive methods of network drivers must * use GFP_ATOMIC (they are called with a spinlock held); * (2) queuecommand methods of scsi drivers must use GFP_ATOMIC (also * called with a spinlock held); * (3) If you use a kernel thread with a network driver you must use * GFP_NOIO, unless (b) or (c) apply; * (4) after you have done a down() you can use GFP_KERNEL, unless (b) or (c) * apply or your are in a storage driver's block io path; * (5) USB probe and disconnect can use GFP_KERNEL unless (b) or (c) apply; and * (6) changing firmware on a running storage or net device uses * GFP_NOIO, unless b) or c) apply * */ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) { int xfertype, max; struct usb_device *dev; struct usb_host_endpoint *ep; int is_out; if (!urb || urb->hcpriv || !urb->complete) return -EINVAL; dev = urb->dev; if ((!dev) || (dev->state < USB_STATE_UNAUTHENTICATED)) return -ENODEV; /* For now, get the endpoint from the pipe. Eventually drivers * will be required to set urb->ep directly and we will eliminate * urb->pipe. */ ep = (usb_pipein(urb->pipe) ? dev->ep_in : dev->ep_out) [usb_pipeendpoint(urb->pipe)]; if (!ep) return -ENOENT; urb->ep = ep; urb->status = -EINPROGRESS; urb->actual_length = 0; /* Lots of sanity checks, so HCDs can rely on clean data * and don't need to duplicate tests */ xfertype = usb_endpoint_type(&ep->desc); if (xfertype == USB_ENDPOINT_XFER_CONTROL) { struct usb_ctrlrequest *setup = (struct usb_ctrlrequest *) urb->setup_packet; if (!setup) return -ENOEXEC; is_out = !(setup->bRequestType & USB_DIR_IN) || !setup->wLength; } else { is_out = usb_endpoint_dir_out(&ep->desc); } /* Cache the direction for later use */ urb->transfer_flags = (urb->transfer_flags & ~URB_DIR_MASK) | (is_out ? URB_DIR_OUT : URB_DIR_IN); if (xfertype != USB_ENDPOINT_XFER_CONTROL && dev->state < USB_STATE_CONFIGURED) return -ENODEV; max = le16_to_cpu(ep->desc.wMaxPacketSize); if (max <= 0) { dev_dbg(&dev->dev, "bogus endpoint ep%d%s in %s (bad maxpacket %d)\n", usb_endpoint_num(&ep->desc), is_out ? "out" : "in", __func__, max); return -EMSGSIZE; } /* periodic transfers limit size per frame/uframe, * but drivers only control those sizes for ISO. * while we're checking, initialize return status. */ if (xfertype == USB_ENDPOINT_XFER_ISOC) { int n, len; /* FIXME SuperSpeed isoc endpoints have up to 16 bursts */ /* "high bandwidth" mode, 1-3 packets/uframe? */ if (dev->speed == USB_SPEED_HIGH) { int mult = 1 + ((max >> 11) & 0x03); max &= 0x07ff; max *= mult; } if (urb->number_of_packets <= 0) return -EINVAL; for (n = 0; n < urb->number_of_packets; n++) { len = urb->iso_frame_desc[n].length; if (len < 0 || len > max) return -EMSGSIZE; urb->iso_frame_desc[n].status = -EXDEV; urb->iso_frame_desc[n].actual_length = 0; } } /* the I/O buffer must be mapped/unmapped, except when length=0 */ if (urb->transfer_buffer_length > INT_MAX) return -EMSGSIZE; #ifdef DEBUG /* stuff that drivers shouldn't do, but which shouldn't * cause problems in HCDs if they get it wrong. */ { unsigned int orig_flags = urb->transfer_flags; unsigned int allowed; /* enforce simple/standard policy */ allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP | URB_NO_INTERRUPT | URB_DIR_MASK | URB_FREE_BUFFER); switch (xfertype) { case USB_ENDPOINT_XFER_BULK: if (is_out) allowed |= URB_ZERO_PACKET; /* FALLTHROUGH */ case USB_ENDPOINT_XFER_CONTROL: allowed |= URB_NO_FSBR; /* only affects UHCI */ /* FALLTHROUGH */ default: /* all non-iso endpoints */ if (!is_out) allowed |= URB_SHORT_NOT_OK; break; case USB_ENDPOINT_XFER_ISOC: allowed |= URB_ISO_ASAP; break; } urb->transfer_flags &= allowed; /* fail if submitter gave bogus flags */ if (urb->transfer_flags != orig_flags) { dev_err(&dev->dev, "BOGUS urb flags, %x --> %x\n", orig_flags, urb->transfer_flags); return -EINVAL; } } #endif /* * Force periodic transfer intervals to be legal values that are * a power of two (so HCDs don't need to). * * FIXME want bus->{intr,iso}_sched_horizon values here. Each HC * supports different values... this uses EHCI/UHCI defaults (and * EHCI can use smaller non-default values). */ switch (xfertype) { case USB_ENDPOINT_XFER_ISOC: case USB_ENDPOINT_XFER_INT: /* too small? */ if (urb->interval <= 0) return -EINVAL; /* too big? */ switch (dev->speed) { case USB_SPEED_SUPER: /* units are 125us */ /* Handle up to 2^(16-1) microframes */ if (urb->interval > (1 << 15)) return -EINVAL; max = 1 << 15; case USB_SPEED_HIGH: /* units are microframes */ /* NOTE usb handles 2^15 */ if (urb->interval > (1024 * 8)) urb->interval = 1024 * 8; max = 1024 * 8; break; case USB_SPEED_FULL: /* units are frames/msec */ case USB_SPEED_LOW: if (xfertype == USB_ENDPOINT_XFER_INT) { if (urb->interval > 255) return -EINVAL; /* NOTE ohci only handles up to 32 */ max = 128; } else { if (urb->interval > 1024) urb->interval = 1024; /* NOTE usb and ohci handle up to 2^15 */ max = 1024; } break; default: return -EINVAL; } /* Round down to a power of 2, no more than max */ urb->interval = min(max, 1 << ilog2(urb->interval)); } return usb_hcd_submit_urb(urb, mem_flags); } EXPORT_SYMBOL_GPL(usb_submit_urb); /*-------------------------------------------------------------------*/ /** * usb_unlink_urb - abort/cancel a transfer request for an endpoint * @urb: pointer to urb describing a previously submitted request, * may be NULL * * This routine cancels an in-progress request. URBs complete only once * per submission, and may be canceled only once per submission. * Successful cancellation means termination of @urb will be expedited * and the completion handler will be called with a status code * indicating that the request has been canceled (rather than any other * code). * * Drivers should not call this routine or related routines, such as * usb_kill_urb() or usb_unlink_anchored_urbs(), after their disconnect * method has returned. The disconnect function should synchronize with * a driver's I/O routines to insure that all URB-related activity has * completed before it returns. * * This request is always asynchronous. Success is indicated by * returning -EINPROGRESS, at which time the URB will probably not yet * have been given back to the device driver. When it is eventually * called, the completion function will see @urb->status == -ECONNRESET. * Failure is indicated by usb_unlink_urb() returning any other value. * Unlinking will fail when @urb is not currently "linked" (i.e., it was * never submitted, or it was unlinked before, or the hardware is already * finished with it), even if the completion handler has not yet run. * * Unlinking and Endpoint Queues: * * [The behaviors and guarantees described below do not apply to virtual * root hubs but only to endpoint queues for physical USB devices.] * * Host Controller Drivers (HCDs) place all the URBs for a particular * endpoint in a queue. Normally the queue advances as the controller * hardware processes each request. But when an URB terminates with an * error its queue generally stops (see below), at least until that URB's * completion routine returns. It is guaranteed that a stopped queue * will not restart until all its unlinked URBs have been fully retired, * with their completion routines run, even if that's not until some time * after the original completion handler returns. The same behavior and * guarantee apply when an URB terminates because it was unlinked. * * Bulk and interrupt endpoint queues are guaranteed to stop whenever an * URB terminates with any sort of error, including -ECONNRESET, -ENOENT, * and -EREMOTEIO. Control endpoint queues behave the same way except * that they are not guaranteed to stop for -EREMOTEIO errors. Queues * for isochronous endpoints are treated differently, because they must * advance at fixed rates. Such queues do not stop when an URB * encounters an error or is unlinked. An unlinked isochronous URB may * leave a gap in the stream of packets; it is undefined whether such * gaps can be filled in. * * Note that early termination of an URB because a short packet was * received will generate a -EREMOTEIO error if and only if the * URB_SHORT_NOT_OK flag is set. By setting this flag, USB device * drivers can build deep queues for large or complex bulk transfers * and clean them up reliably after any sort of aborted transfer by * unlinking all pending URBs at the first fault. * * When a control URB terminates with an error other than -EREMOTEIO, it * is quite likely that the status stage of the transfer will not take * place. */ int usb_unlink_urb(struct urb *urb) { if (!urb) return -EINVAL; if (!urb->dev) return -ENODEV; if (!urb->ep) return -EIDRM; return usb_hcd_unlink_urb(urb, -ECONNRESET); } EXPORT_SYMBOL_GPL(usb_unlink_urb); /** * usb_kill_urb - cancel a transfer request and wait for it to finish * @urb: pointer to URB describing a previously submitted request, * may be NULL * * This routine cancels an in-progress request. It is guaranteed that * upon return all completion handlers will have finished and the URB * will be totally idle and available for reuse. These features make * this an ideal way to stop I/O in a disconnect() callback or close() * function. If the request has not already finished or been unlinked * the completion handler will see urb->status == -ENOENT. * * While the routine is running, attempts to resubmit the URB will fail * with error -EPERM. Thus even if the URB's completion handler always * tries to resubmit, it will not succeed and the URB will become idle. * * This routine may not be used in an interrupt context (such as a bottom * half or a completion handler), or when holding a spinlock, or in other * situations where the caller can't schedule(). * * This routine should not be called by a driver after its disconnect * method has returned. */ void usb_kill_urb(struct urb *urb) { might_sleep(); if (!(urb && urb->dev && urb->ep)) return; atomic_inc(&urb->reject); usb_hcd_unlink_urb(urb, -ENOENT); wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0); atomic_dec(&urb->reject); } EXPORT_SYMBOL_GPL(usb_kill_urb); /** * usb_poison_urb - reliably kill a transfer and prevent further use of an URB * @urb: pointer to URB describing a previously submitted request, * may be NULL * * This routine cancels an in-progress request. It is guaranteed that * upon return all completion handlers will have finished and the URB * will be totally idle and cannot be reused. These features make * this an ideal way to stop I/O in a disconnect() callback. * If the request has not already finished or been unlinked * the completion handler will see urb->status == -ENOENT. * * After and while the routine runs, attempts to resubmit the URB will fail * with error -EPERM. Thus even if the URB's completion handler always * tries to resubmit, it will not succeed and the URB will become idle. * * This routine may not be used in an interrupt context (such as a bottom * half or a completion handler), or when holding a spinlock, or in other * situations where the caller can't schedule(). * * This routine should not be called by a driver after its disconnect * method has returned. */ void usb_poison_urb(struct urb *urb) { might_sleep(); if (!(urb && urb->dev && urb->ep)) return; atomic_inc(&urb->reject); usb_hcd_unlink_urb(urb, -ENOENT); wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0); } EXPORT_SYMBOL_GPL(usb_poison_urb); void usb_unpoison_urb(struct urb *urb) { if (!urb) return; atomic_dec(&urb->reject); } EXPORT_SYMBOL_GPL(usb_unpoison_urb); /** * usb_kill_anchored_urbs - cancel transfer requests en masse * @anchor: anchor the requests are bound to * * this allows all outstanding URBs to be killed starting * from the back of the queue * * This routine should not be called by a driver after its disconnect * method has returned. */ void usb_kill_anchored_urbs(struct usb_anchor *anchor) { struct urb *victim; spin_lock_irq(&anchor->lock); while (!list_empty(&anchor->urb_list)) { victim = list_entry(anchor->urb_list.prev, struct urb, anchor_list); /* we must make sure the URB isn't freed before we kill it*/ usb_get_urb(victim); spin_unlock_irq(&anchor->lock); /* this will unanchor the URB */ usb_kill_urb(victim); usb_put_urb(victim); spin_lock_irq(&anchor->lock); } spin_unlock_irq(&anchor->lock); } EXPORT_SYMBOL_GPL(usb_kill_anchored_urbs); /** * usb_poison_anchored_urbs - cease all traffic from an anchor * @anchor: anchor the requests are bound to * * this allows all outstanding URBs to be poisoned starting * from the back of the queue. Newly added URBs will also be * poisoned * * This routine should not be called by a driver after its disconnect * method has returned. */ void usb_poison_anchored_urbs(struct usb_anchor *anchor) { struct urb *victim; spin_lock_irq(&anchor->lock); anchor->poisoned = 1; while (!list_empty(&anchor->urb_list)) { victim = list_entry(anchor->urb_list.prev, struct urb, anchor_list); /* we must make sure the URB isn't freed before we kill it*/ usb_get_urb(victim); spin_unlock_irq(&anchor->lock); /* this will unanchor the URB */ usb_poison_urb(victim); usb_put_urb(victim); spin_lock_irq(&anchor->lock); } spin_unlock_irq(&anchor->lock); } EXPORT_SYMBOL_GPL(usb_poison_anchored_urbs); /** * usb_unpoison_anchored_urbs - let an anchor be used successfully again * @anchor: anchor the requests are bound to * * Reverses the effect of usb_poison_anchored_urbs * the anchor can be used normally after it returns */ void usb_unpoison_anchored_urbs(struct usb_anchor *anchor) { unsigned long flags; struct urb *lazarus; spin_lock_irqsave(&anchor->lock, flags); list_for_each_entry(lazarus, &anchor->urb_list, anchor_list) { usb_unpoison_urb(lazarus); } anchor->poisoned = 0; spin_unlock_irqrestore(&anchor->lock, flags); } EXPORT_SYMBOL_GPL(usb_unpoison_anchored_urbs); /** * usb_unlink_anchored_urbs - asynchronously cancel transfer requests en masse * @anchor: anchor the requests are bound to * * this allows all outstanding URBs to be unlinked starting * from the back of the queue. This function is asynchronous. * The unlinking is just tiggered. It may happen after this * function has returned. * * This routine should not be called by a driver after its disconnect * method has returned. */ void usb_unlink_anchored_urbs(struct usb_anchor *anchor) { struct urb *victim; unsigned long flags; spin_lock_irqsave(&anchor->lock, flags); while (!list_empty(&anchor->urb_list)) { victim = list_entry(anchor->urb_list.prev, struct urb, anchor_list); usb_get_urb(victim); spin_unlock_irqrestore(&anchor->lock, flags); /* this will unanchor the URB */ usb_unlink_urb(victim); usb_put_urb(victim); spin_lock_irqsave(&anchor->lock, flags); } spin_unlock_irqrestore(&anchor->lock, flags); } EXPORT_SYMBOL_GPL(usb_unlink_anchored_urbs); /** * usb_wait_anchor_empty_timeout - wait for an anchor to be unused * @anchor: the anchor you want to become unused * @timeout: how long you are willing to wait in milliseconds * * Call this is you want to be sure all an anchor's * URBs have finished */ int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor, unsigned int timeout) { return wait_event_timeout(anchor->wait, list_empty(&anchor->urb_list), msecs_to_jiffies(timeout)); } EXPORT_SYMBOL_GPL(usb_wait_anchor_empty_timeout); /** * usb_get_from_anchor - get an anchor's oldest urb * @anchor: the anchor whose urb you want * * this will take the oldest urb from an anchor, * unanchor and return it */ struct urb *usb_get_from_anchor(struct usb_anchor *anchor) { struct urb *victim; unsigned long flags; spin_lock_irqsave(&anchor->lock, flags); if (!list_empty(&anchor->urb_list)) { victim = list_entry(anchor->urb_list.next, struct urb, anchor_list); usb_get_urb(victim); spin_unlock_irqrestore(&anchor->lock, flags); usb_unanchor_urb(victim); } else { spin_unlock_irqrestore(&anchor->lock, flags); victim = NULL; } return victim; } EXPORT_SYMBOL_GPL(usb_get_from_anchor); /** * usb_scuttle_anchored_urbs - unanchor all an anchor's urbs * @anchor: the anchor whose urbs you want to unanchor * * use this to get rid of all an anchor's urbs */ void usb_scuttle_anchored_urbs(struct usb_anchor *anchor) { struct urb *victim; unsigned long flags; spin_lock_irqsave(&anchor->lock, flags); while (!list_empty(&anchor->urb_list)) { victim = list_entry(anchor->urb_list.prev, struct urb, anchor_list); usb_get_urb(victim); spin_unlock_irqrestore(&anchor->lock, flags); /* this may free the URB */ usb_unanchor_urb(victim); usb_put_urb(victim); spin_lock_irqsave(&anchor->lock, flags); } spin_unlock_irqrestore(&anchor->lock, flags); } EXPORT_SYMBOL_GPL(usb_scuttle_anchored_urbs); /** * usb_anchor_empty - is an anchor empty * @anchor: the anchor you want to query * * returns 1 if the anchor has no urbs associated with it */ int usb_anchor_empty(struct usb_anchor *anchor) { return list_empty(&anchor->urb_list); } EXPORT_SYMBOL_GPL(usb_anchor_empty);