From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757423Ab2BAVS2 (ORCPT ); Wed, 1 Feb 2012 16:18:28 -0500 Received: from out4-smtp.messagingengine.com ([66.111.4.28]:58951 "EHLO out4-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757389Ab2BAVRm (ORCPT ); Wed, 1 Feb 2012 16:17:42 -0500 X-Sasl-enc: 5xQDZ0q7qzR95YpcGcrUFsLD444Z3fDDXwsIfSm5TkTH 1328131061 X-Mailbox-Line: From gregkh@clark.kroah.org Wed Feb 1 13:00:49 2012 Message-Id: <20120201210049.705813938@clark.kroah.org> User-Agent: quilt/0.51-15.1 Date: Wed, 01 Feb 2012 13:00:30 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, =?UTF-8?q?Bj=C3=B8rn=20Mork?= , Oliver Neukum Subject: [66/89] USB: cdc-wdm: call wake_up_all to allow driver to shutdown on device removal In-Reply-To: <20120201210505.GA26028@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bjørn Mork commit 62aaf24dc125d7c55c93e313d15611f152b030c7 upstream. wdm_disconnect() waits for the mutex held by wdm_read() before calling wake_up_all(). This causes a deadlock, preventing device removal to complete. Do the wake_up_all() before we start waiting for the locks. Signed-off-by: Bjørn Mork Cc: Oliver Neukum Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-wdm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -786,13 +786,13 @@ static void wdm_disconnect(struct usb_in /* to terminate pending flushes */ clear_bit(WDM_IN_USE, &desc->flags); spin_unlock_irqrestore(&desc->iuspin, flags); + wake_up_all(&desc->wait); mutex_lock(&desc->rlock); mutex_lock(&desc->wlock); kill_urbs(desc); cancel_work_sync(&desc->rxwork); mutex_unlock(&desc->wlock); mutex_unlock(&desc->rlock); - wake_up_all(&desc->wait); if (!desc->count) cleanup(desc); mutex_unlock(&wdm_mutex);