Patch "usbip: vudc: fix: Clear already_seen flag also for ep0" has been added to the 4.9-stable tree

Patch "usbip: vudc: fix: Clear already_seen flag also for ep0" has been added to the 4.9-stable tree

[gregkh]

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 <stable@vger.kernel.org> know about it.


>From 3e448e13a662fb20145916636127995cbf37eb83 Mon Sep 17 00:00:00 2001
From: Krzysztof Opasiak <k.opasiak@samsung.com>
Date: Thu, 1 Dec 2016 19:14:37 +0100
Subject: usbip: vudc: fix: Clear already_seen flag also for ep0

From: Krzysztof Opasiak <k.opasiak@samsung.com>

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.

Fixes: abdb29574322 ("usbip: vudc: Add vudc_transfer")
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/usb/usbip/vudc_transfer.c
+++ b/drivers/usb/usbip/vudc_transfer.c
@@ -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 k.opasiak@samsung.com are

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