Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754708AbcD0ACu (ORCPT ); Tue, 26 Apr 2016 20:02:50 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:40187 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754077AbcDZXOG (ORCPT ); Tue, 26 Apr 2016 19:14:06 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Linus Torvalds" , "Matt Porter" , "Alexandre Bounine" , "Andre van Herk" , "Aurelien Jacquiot" Date: Wed, 27 Apr 2016 01:02:21 +0200 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 137/217] rapidio/rionet: fix deadlock on SMP In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8426:ae4:c500:9cba:69ae:962d:6167 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1519 Lines: 46 3.16.35-rc1 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: Ben Hutchings --- 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)