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>
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index b5e9948..58bc5e3 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -679,6 +679,26 @@
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
*