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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: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2008-12-18 09:17:49 +01:00 committed by Greg Kroah-Hartman
parent 42c65396d4
commit 856395d6e1
2 changed files with 21 additions and 0 deletions
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20
drivers/usb/core/urb.c
View File

@ -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

1
include/linux/usb.h
View File

@ -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);