From patchwork Fri Oct 21 23:56:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenchao Hao X-Patchwork-Id: 13014594 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E885C4332F for ; Fri, 21 Oct 2022 10:40:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229841AbiJUKke (ORCPT ); Fri, 21 Oct 2022 06:40:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229740AbiJUKkb (ORCPT ); Fri, 21 Oct 2022 06:40:31 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08547FFFB4; Fri, 21 Oct 2022 03:40:24 -0700 (PDT) Received: from dggpemm500023.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4Mv18H2j8tzVhxv; Fri, 21 Oct 2022 18:35:43 +0800 (CST) Received: from dggpemm500017.china.huawei.com (7.185.36.178) by dggpemm500023.china.huawei.com (7.185.36.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 21 Oct 2022 18:40:11 +0800 Received: from build.huawei.com (10.175.101.6) by dggpemm500017.china.huawei.com (7.185.36.178) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 21 Oct 2022 18:40:11 +0800 From: Wenchao Hao To: "James E . J . Bottomley" , "Martin K . Petersen" , , CC: Steffen Maier , , , Wenchao Hao Subject: [PATCH v2 2/2] scsi: donot increase scsi_device's iorequest_cnt if dispatch failed Date: Fri, 21 Oct 2022 19:56:38 -0400 Message-ID: <20221021235638.1968832-3-haowenchao@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20221021235638.1968832-1-haowenchao@huawei.com> References: <20221021235638.1968832-1-haowenchao@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm500017.china.huawei.com (7.185.36.178) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org If scsi_dispatch_cmd() failed, the scsi command did not send to disks, so it would never done from LLDs. scsi scsi_queue_rq() would return BLK_STS_RESOURCE if scsi_dispatch_cmd() failed, the related request would be requeued, and the timeout of this request would not fired any more, so no one would increase iodone_cnt which matches with this increase of iorequest_cnt. Signed-off-by: Wenchao Hao Reviewed-by: Mike Christie --- drivers/scsi/scsi_lib.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 8b89fab7c420..71edb9ffbe16 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1469,8 +1469,6 @@ static int scsi_dispatch_cmd(struct scsi_cmnd *cmd) struct Scsi_Host *host = cmd->device->host; int rtn = 0; - atomic_inc(&cmd->device->iorequest_cnt); - /* check if the device is still usable */ if (unlikely(cmd->device->sdev_state == SDEV_DEL)) { /* in SDEV_DEL we error all commands. DID_NO_CONNECT @@ -1764,6 +1762,7 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, goto out_dec_host_busy; } + atomic_inc(&cmd->device->iorequest_cnt); return BLK_STS_OK; out_dec_host_busy: