Commit 856395d6 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
Browse files

USB: extension of anchor API to unpoison an anchor 



This extension allows unpoisoning an anchor allowing drivers that
resubmit URBs to reuse an anchor for methods like resume()

Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 42c65396

drivers/usb/core/urb.c

+20 −0
Original line number Diff line number Diff line
@@ -678,6 +678,26 @@ void usb_poison_anchored_urbs(struct usb_anchor *anchor) 
}

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

include/linux/usb.h

+1 −0
Original line number Diff line number Diff line
@@ -1485,6 +1485,7 @@ extern void usb_poison_urb(struct urb *urb); 
extern void usb_unpoison_urb(struct urb *urb);

extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);

extern void usb_poison_anchored_urbs(struct usb_anchor *anchor);

extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor);

extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor);

extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);

extern void usb_unanchor_urb(struct urb *urb);

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