From: Krzysztof Opasiak <k.opasiak@samsung.com>
Date: Thu, 1 Dec 2016 18:14:37 +0000 (+0100)
Subject: usbip: vudc: fix: Clear already_seen flag also for ep0
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=77bd73ce21fafe2ca80fe09b6e9dbebf93fd4cd6;p=linux-beck.git

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

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>
---

diff --git a/drivers/usb/usbip/vudc_transfer.c b/drivers/usb/usbip/vudc_transfer.c
index aba6bd478045..bc0296d937d0 100644
--- 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;