Patch "usbip: vudc: fix: Clear already_seen flag also for ep0" 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

usbip: vudc: fix: Clear already_seen flag also for ep0

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:
usbip-vudc-fix-clear-already_seen-flag-also-for-ep0.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: Krzysztof Opasiak <[email protected]>
Date: Thu, 1 Dec 2016 19:14:37 +0100
Subject: usbip: vudc: fix: Clear already_seen flag also for ep0

From: Krzysztof Opasiak <[email protected]>

commit 3e448e13a662fb20145916636127995cbf37eb83 upstream.

ep_list inside gadget structure doesn't contain ep0. It is stored separately in ep0 field.

This causes an urb hang if gadget driver decides to delay setup handling. On host side this is visible as timeout error when setting configuration.

This bug can be reproduced using for example any gadget with mass storage function.

---
 drivers/usb/usbip/vudc_transfer.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -339,6 +339,8 @@ static void v_timer(unsigned long _vudc)
 		total = timer->frame_limit;
 	}
 
+	/* We have to clear ep0 flags separately as it's not on the list */
+	udc->ep[0].already_seen = 0;
 	list_for_each_entry(_ep, &udc->gadget.ep_list, ep_list) {
 		ep = to_vep(_ep);
 		ep->already_seen = 0;

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

queue-4.9/usbip-vudc-fix-clear-already_seen-flag-also-for-ep0.patch