From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932952AbcDJTQ7 (ORCPT ); Sun, 10 Apr 2016 15:16:59 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:54117 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932727AbcDJTJH (ORCPT ); Sun, 10 Apr 2016 15:09:07 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Aurelien Jacquiot , Alexandre Bounine , Matt Porter , Andre van Herk , Andrew Morton , Linus Torvalds Subject: [PATCH 4.4 155/210] rapidio/rionet: fix deadlock on SMP Date: Sun, 10 Apr 2016 11:36:16 -0700 Message-Id: <20160410183532.142700865@linuxfoundation.org> X-Mailer: git-send-email 2.8.0 In-Reply-To: <20160410183526.651820045@linuxfoundation.org> References: <20160410183526.651820045@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 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Aurelien Jacquiot commit 36915976eca58f2eefa040ba8f9939672564df61 upstream. Fix deadlocking during concurrent receive and transmit operations on SMP platforms caused by the use of incorrect lock: on transmit 'tx_lock' spinlock should be used instead of 'lock' which is used for receive operation. This fix is applicable to kernel versions starting from v2.15. Signed-off-by: Aurelien Jacquiot Signed-off-by: Alexandre Bounine Cc: Matt Porter Cc: Andre van Herk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- drivers/net/rionet.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/net/rionet.c +++ b/drivers/net/rionet.c @@ -280,7 +280,7 @@ static void rionet_outb_msg_event(struct struct net_device *ndev = dev_id; struct rionet_private *rnet = netdev_priv(ndev); - spin_lock(&rnet->lock); + spin_lock(&rnet->tx_lock); if (netif_msg_intr(rnet)) printk(KERN_INFO @@ -299,7 +299,7 @@ static void rionet_outb_msg_event(struct if (rnet->tx_cnt < RIONET_TX_RING_SIZE) netif_wake_queue(ndev); - spin_unlock(&rnet->lock); + spin_unlock(&rnet->tx_lock); } static int rionet_open(struct net_device *ndev)