From patchwork Mon Jun 23 22:39:17 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 4405151 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 [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1DAE59F387 for ; Mon, 23 Jun 2014 22:39:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3B3CD20218 for ; Mon, 23 Jun 2014 22:39:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 54D5E2018E for ; Mon, 23 Jun 2014 22:39:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752014AbaFWWjU (ORCPT ); Mon, 23 Jun 2014 18:39:20 -0400 Received: from mail-ie0-f177.google.com ([209.85.223.177]:60662 "EHLO mail-ie0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750931AbaFWWjT (ORCPT ); Mon, 23 Jun 2014 18:39:19 -0400 Received: by mail-ie0-f177.google.com with SMTP id tp5so6320841ieb.22 for ; Mon, 23 Jun 2014 15:39:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:subject:from:to:date:message-id:in-reply-to:references :user-agent:mime-version:content-type:content-transfer-encoding; bh=7gGXcbZq0jO9/gntj7DSxpBS0izNg3o7ba4uWmdgxr8=; b=lBgQMmuQ62cKN7x+78o47ZDkm26OaqHHKSdHAkhykUUVo1PE9H9nLPE5KbDuCRCI1T W5KceBhsZmkG4CJFXhtGYvDZKWV/2SMTqoWUMF9KHgBJ74W5i+/qQmNecU8ascSTZ03F kC83EFGZ0MjZc7Jo9m22rT6eoD5DERKh6T5r/en2iDAr+OR1ms+w+Aw2gQ4LTrPhF8x2 xLy2pnRqsbcYq6bQW+4Mhyh1G1UeGAifYaJxseSKlzfBJGX3WsYTK/a3fPI1c2u/spWx 5KW5XJn1E3ydIRljRRuW8rFAlixOTTF4Ghreui8UEy+4FoEmQyat5QYxpMkv9+DoxFBg arVw== X-Received: by 10.42.83.7 with SMTP id f7mr17420956icl.65.1403563158863; Mon, 23 Jun 2014 15:39:18 -0700 (PDT) Received: from manet.1015granger.net ([2604:8800:100:81fc:82ee:73ff:fe43:d64f]) by mx.google.com with ESMTPSA id qa4sm1491494igb.10.2014.06.23.15.39.18 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Jun 2014 15:39:18 -0700 (PDT) Subject: [PATCH v1 02/13] xprtrdma: Protect ->qp during FRMR deregistration From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Mon, 23 Jun 2014 18:39:17 -0400 Message-ID: <20140623223917.1634.39429.stgit@manet.1015granger.net> In-Reply-To: <20140623223201.1634.83888.stgit@manet.1015granger.net> References: <20140623223201.1634.83888.stgit@manet.1015granger.net> User-Agent: StGit/0.17.1-3-g7d0f MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID,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 Ensure the QP remains valid while posting LOCAL_INV during a transport reconnect. Otherwise, ia->ri_id->qp is NULL, which triggers a panic. BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=259 Fixes: ec62f40d3505a643497d105c297093bb90afd44e Signed-off-by: Chuck Lever --- net/sunrpc/xprtrdma/verbs.c | 14 +++++++++++--- net/sunrpc/xprtrdma/xprt_rdma.h | 1 + 2 files changed, 12 insertions(+), 3 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 78bd7c6..f70b8ad 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -613,6 +613,7 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) /* Else will do memory reg/dereg for each chunk */ ia->ri_memreg_strategy = memreg; + rwlock_init(&ia->ri_qplock); return 0; out2: rdma_destroy_id(ia->ri_id); @@ -859,7 +860,7 @@ rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) int rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) { - struct rdma_cm_id *id; + struct rdma_cm_id *id, *old; int rc = 0; int retry_count = 0; @@ -905,9 +906,14 @@ retry: rc = -ENETUNREACH; goto out; } - rdma_destroy_qp(ia->ri_id); - rdma_destroy_id(ia->ri_id); + + write_lock(&ia->ri_qplock); + old = ia->ri_id; ia->ri_id = id; + write_unlock(&ia->ri_qplock); + + rdma_destroy_qp(old); + rdma_destroy_id(old); } else { dprintk("RPC: %s: connecting...\n", __func__); rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); @@ -1597,7 +1603,9 @@ rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg *seg, invalidate_wr.ex.invalidate_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; DECR_CQCOUNT(&r_xprt->rx_ep); + read_lock(&ia->ri_qplock); rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr); + read_unlock(&ia->ri_qplock); if (rc) dprintk("RPC: %s: failed ib_post_send for invalidate," " status %i\n", __func__, rc); diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index 89e7cd4..97ca516 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -59,6 +59,7 @@ * Interface Adapter -- one per transport instance */ struct rpcrdma_ia { + rwlock_t ri_qplock; struct rdma_cm_id *ri_id; struct ib_pd *ri_pd; struct ib_mr *ri_bind_mem;