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authorOliver Neukum <oliver@neukum.org>2008-12-18 09:17:49 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2009-01-07 10:00:11 -0800
commit856395d6e137b4e7194972cb7765f3de6a72ba61 (patch)
treef10166dcb6dd2a7df98542a18c8e01161e5a2caf
parent42c65396d4f10f25bdab13f8e2f33fe63fa94418 (diff)
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.c20
-rw-r--r--include/linux/usb.h1
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index b5e9948698b..58bc5e3c256 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 4e8654a1825..e8963989650 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);