From patchwork Thu Sep 16 09:33:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 12498415 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 15568C433FE for ; Thu, 16 Sep 2021 09:24:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE49C61246 for ; Thu, 16 Sep 2021 09:24:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235418AbhIPJZ3 (ORCPT ); Thu, 16 Sep 2021 05:25:29 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:15427 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235479AbhIPJZ0 (ORCPT ); Thu, 16 Sep 2021 05:25:26 -0400 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4H9BPV1rhhzRG9V; Thu, 16 Sep 2021 17:19:58 +0800 (CST) Received: from dggema762-chm.china.huawei.com (10.1.198.204) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2308.8; Thu, 16 Sep 2021 17:24:04 +0800 Received: from huawei.com (10.175.127.227) by dggema762-chm.china.huawei.com (10.1.198.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.8; Thu, 16 Sep 2021 17:24:03 +0800 From: Yu Kuai To: , , , CC: , , , , Subject: [patch v8 4/7] nbd: don't start request if nbd_queue_rq() failed Date: Thu, 16 Sep 2021 17:33:47 +0800 Message-ID: <20210916093350.1410403-5-yukuai3@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210916093350.1410403-1-yukuai3@huawei.com> References: <20210916093350.1410403-1-yukuai3@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.127.227] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggema762-chm.china.huawei.com (10.1.198.204) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org commit 6a468d5990ec ("nbd: don't start req until after the dead connection logic") move blk_mq_start_request() from nbd_queue_rq() to nbd_handle_cmd() to skip starting request if the connection is dead. However, request is still started in other error paths. Currently, blk_mq_end_request() will be called immediately if nbd_queue_rq() failed, thus start request in such situation is useless. So remove blk_mq_start_request() from error paths in nbd_handle_cmd(). Signed-off-by: Yu Kuai Reviewed-by: Ming Lei --- drivers/block/nbd.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index c724a5bd7fa4..22c91d8901f6 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -934,7 +934,6 @@ static int nbd_handle_cmd(struct nbd_cmd *cmd, int index) if (!refcount_inc_not_zero(&nbd->config_refs)) { dev_err_ratelimited(disk_to_dev(nbd->disk), "Socks array is empty\n"); - blk_mq_start_request(req); return -EINVAL; } config = nbd->config; @@ -943,7 +942,6 @@ static int nbd_handle_cmd(struct nbd_cmd *cmd, int index) dev_err_ratelimited(disk_to_dev(nbd->disk), "Attempted send on invalid socket\n"); nbd_config_put(nbd); - blk_mq_start_request(req); return -EINVAL; } cmd->status = BLK_STS_OK; @@ -967,7 +965,6 @@ static int nbd_handle_cmd(struct nbd_cmd *cmd, int index) */ sock_shutdown(nbd); nbd_config_put(nbd); - blk_mq_start_request(req); return -EIO; } goto again;