Patch "usb: core: unlink urbs from the tail of the endpoint's urb_list" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

usb: core: unlink urbs from the tail of the endpoint's urb_list

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-core-unlink-urbs-from-the-tail-of-the-endpoint-s-urb_list.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Bin Liu <[email protected]>
Date: Tue, 25 Jul 2017 09:31:33 -0500
Subject: usb: core: unlink urbs from the tail of the endpoint's urb_list

From: Bin Liu <[email protected]>

commit 2eac13624364db5b5e1666ae0bb3a4d36bc56b6e upstream.

While unlink an urb, if the urb has been programmed in the controller, the controller driver might do some hw related actions to tear down the urb.

Currently usb_hcd_flush_endpoint() passes each urb from the head of the endpoint's urb_list to the controller driver, which could make the controller driver think each urb has been programmed and take the unnecessary actions for each urb.

This patch changes the behavior in usb_hcd_flush_endpoint() to pass the urbs from the tail of the list, to avoid any unnecessary actions in an controller driver.

---
 drivers/usb/core/hcd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -1877,7 +1877,7 @@ void usb_hcd_flush_endpoint(struct usb_d
 	/* No more submits can occur */
 	spin_lock_irq(&hcd_urb_list_lock);
 rescan:
-	list_for_each_entry (urb, &ep->urb_list, urb_list) {
+	list_for_each_entry_reverse(urb, &ep->urb_list, urb_list) {
 		int	is_in;
 
 		if (urb->unlinked)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/usb-core-unlink-urbs-from-the-tail-of-the-endpoint-s-urb_list.patch queue-4.9/usb-musb-fix-tx-fifo-flush-handling-again.patch