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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 54A20C43387 for ; Wed, 9 Jan 2019 19:22:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2C139206BA for ; Wed, 9 Jan 2019 19:22:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728472AbfAITWw (ORCPT ); Wed, 9 Jan 2019 14:22:52 -0500 Received: from ale.deltatee.com ([207.54.116.67]:59738 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728215AbfAITWu (ORCPT ); Wed, 9 Jan 2019 14:22:50 -0500 Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1ghJR2-00053v-GD; Wed, 09 Jan 2019 12:22:49 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1ghJR1-0001Vw-OH; Wed, 09 Jan 2019 12:22:39 -0700 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-ntb@googlegroups.com, Jon Mason Cc: Allen Hubbe , Dave Jiang , Serge Semin , Logan Gunthorpe Date: Wed, 9 Jan 2019 12:22:32 -0700 Message-Id: <20190109192233.5752-8-logang@deltatee.com> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20190109192233.5752-1-logang@deltatee.com> References: <20190109192233.5752-1-logang@deltatee.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-kernel@vger.kernel.org, linux-ntb@googlegroups.com, jdmason@kudzu.us, dave.jiang@intel.com, allenbh@gmail.com, fancer.lancer@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 7/8] NTB: perf: Fix race condition when run with ntb_test X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When running ntb_test, the script tries to run the ntb_perf test immediately after probing the modules. Since adding multi-port support, this fails seeing the new initialization procedure in ntb_perf can not complete instantly. To fix this we add a completion which is waited on when a test is started. In this way, run can be written any time after the module is loaded and it will wait for the initialization to complete instead of sending an error. Fixes: 5648e56d03fa ("NTB: ntb_perf: Add full multi-port NTB API support") Signed-off-by: Logan Gunthorpe Acked-by: Allen Hubbe Tested-by: Alexander Fomichev --- drivers/ntb/test/ntb_perf.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c index 7165f7ab8e35..2c11e513cf78 100644 --- a/drivers/ntb/test/ntb_perf.c +++ b/drivers/ntb/test/ntb_perf.c @@ -158,6 +158,8 @@ struct perf_peer { /* NTB connection setup service */ struct work_struct service; unsigned long sts; + + struct completion init_comp; }; #define to_peer_service(__work) \ container_of(__work, struct perf_peer, service) @@ -549,6 +551,7 @@ static int perf_setup_outbuf(struct perf_peer *peer) /* Initialization is finally done */ set_bit(PERF_STS_DONE, &peer->sts); + complete_all(&peer->init_comp); return 0; } @@ -639,6 +642,7 @@ static void perf_service_work(struct work_struct *work) perf_setup_outbuf(peer); if (test_and_clear_bit(PERF_CMD_CLEAR, &peer->sts)) { + init_completion(&peer->init_comp); clear_bit(PERF_STS_DONE, &peer->sts); if (test_bit(0, &peer->perf->busy_flag) && peer == peer->perf->test_peer) { @@ -1046,8 +1050,9 @@ static int perf_submit_test(struct perf_peer *peer) struct perf_thread *pthr; int tidx, ret; - if (!test_bit(PERF_STS_DONE, &peer->sts)) - return -ENOLINK; + ret = wait_for_completion_interruptible(&peer->init_comp); + if (ret < 0) + return ret; if (test_and_set_bit_lock(0, &perf->busy_flag)) return -EBUSY; @@ -1413,6 +1418,7 @@ static int perf_init_peers(struct perf_ctx *perf) peer->gidx = pidx; } INIT_WORK(&peer->service, perf_service_work); + init_completion(&peer->init_comp); } if (perf->gidx == -1) perf->gidx = pidx; -- 2.19.0