Commit 856395d6 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman

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: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 42c65396
...@@ -678,6 +678,26 @@ void usb_poison_anchored_urbs(struct usb_anchor *anchor) ...@@ -678,6 +678,26 @@ void usb_poison_anchored_urbs(struct usb_anchor *anchor)
} }
EXPORT_SYMBOL_GPL(usb_poison_anchored_urbs); 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 * usb_unlink_anchored_urbs - asynchronously cancel transfer requests en masse
* @anchor: anchor the requests are bound to * @anchor: anchor the requests are bound to
......
...@@ -1485,6 +1485,7 @@ extern void usb_poison_urb(struct urb *urb); ...@@ -1485,6 +1485,7 @@ extern void usb_poison_urb(struct urb *urb);
extern void usb_unpoison_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_kill_anchored_urbs(struct usb_anchor *anchor);
extern void usb_poison_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_unlink_anchored_urbs(struct usb_anchor *anchor);
extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor); extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);
extern void usb_unanchor_urb(struct urb *urb); extern void usb_unanchor_urb(struct urb *urb);
......
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