From eda769593bbae8aee4e336b0732f6016353301a3 Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Thu, 10 Apr 2008 14:07:37 +0200 Subject: USB: add extension of anchor API, usb_unlink_anchored_urbs This adds the ability to trigger asynchronous unlinks of anchored URBs. This is needed for error handling in the comntext of completion handlers, which cannot sleep. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/urb.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'drivers') diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index 9d7e63292c01..1d3ed1322fbe 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -589,6 +589,30 @@ void usb_kill_anchored_urbs(struct usb_anchor *anchor) } EXPORT_SYMBOL_GPL(usb_kill_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. + */ +void usb_unlink_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); + /* this will unanchor the URB */ + usb_unlink_urb(victim); + } + spin_unlock_irq(&anchor->lock); +} +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 -- cgit v1.2.1