From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D62E4C433DF for ; Mon, 24 Aug 2020 10:33:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3BE621741 for ; Mon, 24 Aug 2020 10:33:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598265198; bh=/Ok6EOxBXX5c0FyexeUKSuc+06fEIwUImbMlHxP1/18=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LBTcCQ63vWlireI3wjXlX64qYl+k6bUuIg3HOBVKCTsRYUec6J8Ph87JFa/gBs+Gv JJ3akLjdwCcorusj5e+hnHTMA7ahh3u2U4X0MNXiyctlsyrbubZ+EmR0tSiGfAVKG8 7tTXAeJXSqaf5gXnETKyd8aO1sX24iC37BKCWcMI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727040AbgHXKdH (ORCPT ); Mon, 24 Aug 2020 06:33:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:55600 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725968AbgHXKdD (ORCPT ); Mon, 24 Aug 2020 06:33:03 -0400 Received: from localhost (unknown [213.57.247.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A5DFB207D3; Mon, 24 Aug 2020 10:33:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598265183; bh=/Ok6EOxBXX5c0FyexeUKSuc+06fEIwUImbMlHxP1/18=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z+SLyAgqhAoPn+lILTKVPoBpz5hOYxn21MOpZf0ECmb0X0ZaTzbupSuuvV2UT0V/g 4FXBZ4AkuiajXvG6+HW5lLxhpqpyInFZSlUVF9KcL+YV8wwHtxS7qen3pUAMIVi3kC WQXUIo8a5BHNb5y4IG1/F49pS4vM+Wp5K83HyEnA= From: Leon Romanovsky To: Doug Ledford , Jason Gunthorpe Cc: Leon Romanovsky , Eli Cohen , Jack Morgenstein , linux-rdma@vger.kernel.org, Or Gerlitz , Roland Dreier Subject: [PATCH rdma-next 04/10] RDMA/mlx5: Fix potential race between destroy and CQE poll Date: Mon, 24 Aug 2020 13:32:41 +0300 Message-Id: <20200824103247.1088464-5-leon@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200824103247.1088464-1-leon@kernel.org> References: <20200824103247.1088464-1-leon@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Leon Romanovsky The SRQ can be destroyed right before mlx5_cmd_get_srq is called. In such case the latter will return NULL instead of expected SRQ. Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters") Signed-off-by: Leon Romanovsky --- drivers/infiniband/hw/mlx5/cq.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c index 34c2cd57d994..2bac246b9fef 100644 --- a/drivers/infiniband/hw/mlx5/cq.c +++ b/drivers/infiniband/hw/mlx5/cq.c @@ -168,7 +168,7 @@ static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe, { enum rdma_link_layer ll = rdma_port_get_link_layer(qp->ibqp.device, 1); struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.device); - struct mlx5_ib_srq *srq; + struct mlx5_ib_srq *srq = NULL; struct mlx5_ib_wq *wq; u16 wqe_ctr; u8 roce_packet_type; @@ -180,7 +180,8 @@ static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe, if (qp->ibqp.xrcd) { msrq = mlx5_cmd_get_srq(dev, be32_to_cpu(cqe->srqn)); - srq = to_mibsrq(msrq); + if (msrq) + srq = to_mibsrq(msrq); } else { srq = to_msrq(qp->ibqp.srq); } -- 2.26.2