From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752323AbcFEK4G (ORCPT ); Sun, 5 Jun 2016 06:56:06 -0400 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:21663 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751799AbcFEKVZ (ORCPT ); Sun, 5 Jun 2016 06:21:25 -0400 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Aurelien Jacquiot , Alexandre Bounine , Matt Porter , Andre van Herk , Andrew Morton , Linus Torvalds , Willy Tarreau Subject: [PATCH 3.10 040/143] rapidio/rionet: fix deadlock on SMP Date: Sun, 5 Jun 2016 12:19:03 +0200 Message-Id: <1465122046-9645-41-git-send-email-w@1wt.eu> X-Mailer: git-send-email 2.8.0.rc2.1.gbe9624a In-Reply-To: <1465122046-9645-1-git-send-email-w@1wt.eu> References: <1465122046-9645-1-git-send-email-w@1wt.eu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Willy Tarreau --- drivers/net/rionet.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c index f433b59..00a8128 100644 --- a/drivers/net/rionet.c +++ b/drivers/net/rionet.c @@ -269,7 +269,7 @@ static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbo 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 @@ -288,7 +288,7 @@ static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbo 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) -- 2.8.0.rc2.1.gbe9624a