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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 <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -589,6 +589,30 @@ void usb_kill_anchored_urbs(struct usb_anchor *anchor)
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}
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}
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EXPORT_SYMBOL_GPL(usb_kill_anchored_urbs);
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EXPORT_SYMBOL_GPL(usb_kill_anchored_urbs);
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/**
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* usb_unlink_anchored_urbs - asynchronously cancel transfer requests en masse
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* @anchor: anchor the requests are bound to
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*
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* this allows all outstanding URBs to be unlinked starting
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* from the back of the queue. This function is asynchronous.
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* The unlinking is just tiggered. It may happen after this
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* function has returned.
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*/
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void usb_unlink_anchored_urbs(struct usb_anchor *anchor)
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{
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struct urb *victim;
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spin_lock_irq(&anchor->lock);
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while (!list_empty(&anchor->urb_list)) {
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victim = list_entry(anchor->urb_list.prev, struct urb,
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anchor_list);
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/* this will unanchor the URB */
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usb_unlink_urb(victim);
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}
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spin_unlock_irq(&anchor->lock);
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}
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EXPORT_SYMBOL_GPL(usb_unlink_anchored_urbs);
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/**
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/**
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* usb_wait_anchor_empty_timeout - wait for an anchor to be unused
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* usb_wait_anchor_empty_timeout - wait for an anchor to be unused
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* @anchor: the anchor you want to become unused
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* @anchor: the anchor you want to become unused
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@ -1451,6 +1451,7 @@ extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags);
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extern int usb_unlink_urb(struct urb *urb);
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extern int usb_unlink_urb(struct urb *urb);
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extern void usb_kill_urb(struct urb *urb);
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extern void usb_kill_urb(struct urb *urb);
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extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);
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extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);
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extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor);
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extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);
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extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);
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extern void usb_unanchor_urb(struct urb *urb);
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extern void usb_unanchor_urb(struct urb *urb);
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extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor,
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extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor,
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