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| author | Oliver Neukum <oliver@neukum.org> | 2008-12-18 11:17:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-01-07 21:00:11 +0300 |
| commit | 856395d6e137b4e7194972cb7765f3de6a72ba61 (patch) | |
| tree | f10166dcb6dd2a7df98542a18c8e01161e5a2caf | |
| parent | 42c65396d4f10f25bdab13f8e2f33fe63fa94418 (diff) | |
| download | linux-856395d6e137b4e7194972cb7765f3de6a72ba61.tar.xz | |
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>
| -rw-r--r-- | drivers/usb/core/urb.c | 20 | ||||
| -rw-r--r-- | include/linux/usb.h | 1 |
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index b5e9948698bf..58bc5e3c2560 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -679,6 +679,26 @@ 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 * diff --git a/include/linux/usb.h b/include/linux/usb.h index 4e8654a18250..e89639896508 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -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); |