Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753098AbdFQWmE (ORCPT ); Sat, 17 Jun 2017 18:42:04 -0400 Received: from omzsmtpe01.verizonbusiness.com ([199.249.25.210]:24878 "EHLO omzsmtpe01.verizonbusiness.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752992AbdFQWZL (ORCPT ); Sat, 17 Jun 2017 18:25:11 -0400 X-IronPort-Anti-Spam-Filtered: false From: "Levin, Alexander (Sasha Levin)" Cc: Igor Druzhinin , "David S . Miller" , "Levin, Alexander (Sasha Levin)" X-IronPort-AV: E=Sophos;i="5.39,316,1493683200"; d="scan'208";a="220488951" X-Host: discovery.odc.vzwcorp.com To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH for v4.9 LTS 26/86] xen-netback: protect resource cleaning on XenBus disconnect Thread-Topic: [PATCH for v4.9 LTS 26/86] xen-netback: protect resource cleaning on XenBus disconnect Thread-Index: AQHS57iAYBoTnVECa06kfct0NaylnQ== Date: Sat, 17 Jun 2017 22:24:36 +0000 Message-ID: <20170617222420.19316-26-alexander.levin@verizon.com> References: <20170617222420.19316-1-alexander.levin@verizon.com> In-Reply-To: <20170617222420.19316-1-alexander.levin@verizon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id v5HMgIG4023637 Content-Length: 2398 Lines: 69 From: Igor Druzhinin [ Upstream commit f16f1df65f1cf139ff9e9f84661e6573d6bb27fc ] vif->lock is used to protect statistics gathering agents from using the queue structure during cleaning. Signed-off-by: Igor Druzhinin Acked-by: Wei Liu Reviewed-by: Paul Durrant Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/xen-netback/interface.c | 6 ++++-- drivers/net/xen-netback/xenbus.c | 2 ++ 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index 74dc2bf71428..b009d7966b46 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -221,18 +221,18 @@ static struct net_device_stats *xenvif_get_stats(struct net_device *dev) { struct xenvif *vif = netdev_priv(dev); struct xenvif_queue *queue = NULL; - unsigned int num_queues = vif->num_queues; unsigned long rx_bytes = 0; unsigned long rx_packets = 0; unsigned long tx_bytes = 0; unsigned long tx_packets = 0; unsigned int index; + spin_lock(&vif->lock); if (vif->queues == NULL) goto out; /* Aggregate tx and rx stats from each queue */ - for (index = 0; index < num_queues; ++index) { + for (index = 0; index < vif->num_queues; ++index) { queue = &vif->queues[index]; rx_bytes += queue->stats.rx_bytes; rx_packets += queue->stats.rx_packets; @@ -241,6 +241,8 @@ static struct net_device_stats *xenvif_get_stats(struct net_device *dev) } out: + spin_unlock(&vif->lock); + vif->dev->stats.rx_bytes = rx_bytes; vif->dev->stats.rx_packets = rx_packets; vif->dev->stats.tx_bytes = tx_bytes; diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index abffdbded5f2..b44f37fff890 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -503,9 +503,11 @@ static void backend_disconnect(struct backend_info *be) for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index) xenvif_deinit_queue(&be->vif->queues[queue_index]); + spin_lock(&be->vif->lock); vfree(be->vif->queues); be->vif->num_queues = 0; be->vif->queues = NULL; + spin_unlock(&be->vif->lock); xenvif_disconnect_ctrl(be->vif); } -- 2.11.0