From patchwork Wed Mar 25 21:20:11 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Somnath Kotur X-Patchwork-Id: 6087951 Return-Path: X-Original-To: patchwork-linux-rdma@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D57B69F350 for ; Wed, 25 Mar 2015 04:55:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 031392017E for ; Wed, 25 Mar 2015 04:55:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E586D20364 for ; Wed, 25 Mar 2015 04:55:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752146AbbCYEzk (ORCPT ); Wed, 25 Mar 2015 00:55:40 -0400 Received: from cmexedge1.emulex.com ([138.239.224.99]:21260 "EHLO CMEXEDGE1.ext.emulex.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752099AbbCYEzj (ORCPT ); Wed, 25 Mar 2015 00:55:39 -0400 Received: from CMEXHTCAS2.ad.emulex.com (138.239.115.218) by CMEXEDGE1.ext.emulex.com (138.239.224.99) with Microsoft SMTP Server (TLS) id 14.3.210.2; Tue, 24 Mar 2015 21:55:46 -0700 Received: from codebrowse.emulex.com (10.192.207.129) by smtp.emulex.com (138.239.115.208) with Microsoft SMTP Server id 14.3.210.2; Tue, 24 Mar 2015 21:55:36 -0700 From: Somnath Kotur To: CC: , Moni Shoua , "Somnath Kotur" Subject: [PATCH v3 for-next 22/33] IB/mlx4: Lock with RCU instead of RTNL Date: Thu, 26 Mar 2015 02:50:11 +0530 X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1427318422-12004-1-git-send-email-somnath.kotur@emulex.com> References: <1427318422-12004-1-git-send-email-somnath.kotur@emulex.com> MIME-Version: 1.0 Message-ID: <1b745f6c-6e0f-45d5-87e8-4405dd3224e7@CMEXHTCAS2.ad.emulex.com> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-3.7 required=5.0 tests=BAYES_00, DATE_IN_FUTURE_12_24, RCVD_IN_DNSWL_HI,T_RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Moni Shoua The function eth_link_query_port() used to take the RTNL lock when call to netdev_master_upper_dev_get() was necessary. This makes it impossible to call this function with RTNL lock is held. Calling netdev_master_upper_dev_get_rcu() and locking with RCU instead solve this problem. Signed-off-by: Moni Shoua Signed-off-by: Somnath Kotur --- drivers/infiniband/hw/mlx4/main.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index d8b227e..32cd009 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -367,14 +367,15 @@ static int eth_link_query_port(struct ib_device *ibdev, u8 port, props->state = IB_PORT_DOWN; props->phys_state = state_to_phys_state(props->state); props->active_mtu = IB_MTU_256; - if (is_bonded) - rtnl_lock(); /* required to get upper dev */ down_read(&iboe->sem); ndev = iboe->netdevs[port - 1]; - if (ndev && is_bonded) - ndev = netdev_master_upper_dev_get(ndev); + if (ndev && is_bonded) { + rcu_read_lock(); /* required to get upper dev */ + ndev = netdev_master_upper_dev_get_rcu(ndev); + rcu_read_unlock(); + } if (!ndev) - goto out_unlock; + goto unlock; tmp = iboe_get_mtu(ndev->mtu); props->active_mtu = tmp ? min(props->max_mtu, tmp) : IB_MTU_256; @@ -382,10 +383,8 @@ static int eth_link_query_port(struct ib_device *ibdev, u8 port, props->state = (netif_running(ndev) && netif_carrier_ok(ndev)) ? IB_PORT_ACTIVE : IB_PORT_DOWN; props->phys_state = state_to_phys_state(props->state); -out_unlock: +unlock: up_read(&iboe->sem); - if (is_bonded) - rtnl_unlock(); out: mlx4_free_cmd_mailbox(mdev->dev, mailbox); return err;