From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935102AbcIEQsM (ORCPT ); Mon, 5 Sep 2016 12:48:12 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:52313 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935073AbcIEQsF (ORCPT ); Mon, 5 Sep 2016 12:48:05 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alan Stern , Lu Baolu Subject: [PATCH 4.7 030/143] usb: misc: usbtest: add fix for driver hang Date: Mon, 5 Sep 2016 18:43:26 +0200 Message-Id: <20160905164431.903682390@linuxfoundation.org> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20160905164430.593075551@linuxfoundation.org> References: <20160905164430.593075551@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lu Baolu commit 539587511835ea12d8daa444cbed766cf2bc3612 upstream. In sg_timeout(), req->status is set to "-ETIMEDOUT" before calling into usb_sg_cancel(). usb_sg_cancel() will do nothing and return directly if req->status has been set to a non-zero value. This will cause driver hang whenever transfer time out is triggered. This patch fixes this issue. It could be backported to stable kernel with version later than v3.15. Cc: Alan Stern Signed-off-by: Lu Baolu Suggested-by: Alan Stern Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/misc/usbtest.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/usb/misc/usbtest.c +++ b/drivers/usb/misc/usbtest.c @@ -585,7 +585,6 @@ static void sg_timeout(unsigned long _re { struct usb_sg_request *req = (struct usb_sg_request *) _req; - req->status = -ETIMEDOUT; usb_sg_cancel(req); } @@ -616,8 +615,10 @@ static int perform_sglist( mod_timer(&sg_timer, jiffies + msecs_to_jiffies(SIMPLE_IO_TIMEOUT)); usb_sg_wait(req); - del_timer_sync(&sg_timer); - retval = req->status; + if (!del_timer_sync(&sg_timer)) + retval = -ETIMEDOUT; + else + retval = req->status; /* FIXME check resulting data pattern */