From: Oliver Neukum <oliver@xxxxxxxxxx>
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@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/core/urb.c | 20 ++++++++++++++++++++
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 b5e9948..58bc5e3 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 4e8654a..e896398 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);
--
1.6.0.4
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