From patchwork Mon Sep 26 18:28:59 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 9351183 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2E2FA6086A for ; Mon, 26 Sep 2016 18:44:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 211A928A58 for ; Mon, 26 Sep 2016 18:44:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 15BF628AD1; Mon, 26 Sep 2016 18:44:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EF59C28AD0 for ; Mon, 26 Sep 2016 18:44:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1035009AbcIZSoT (ORCPT ); Mon, 26 Sep 2016 14:44:19 -0400 Received: from mail-co1nam03on0051.outbound.protection.outlook.com ([104.47.40.51]:42176 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1034762AbcIZSoP (ORCPT ); Mon, 26 Sep 2016 14:44:15 -0400 X-Greylist: delayed 1035 seconds by postgrey-1.27 at vger.kernel.org; Mon, 26 Sep 2016 14:44:15 EDT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sandiskcorp.onmicrosoft.com; s=selector1-sandisk-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=oWP08dcCef7EjCwrkF9l6bmRmN+z6pg9TAEf70F/YMc=; b=ac43eTJfFouvY+63JXVqK2dDN3DFeDsWLjSH8g21iLdSzhTayZvppTpCLbE3gD2SyTU6bfi83itKvph1s42TJYN4z2THMbx3s/VQyq/QQ421Z1y9aklICRkcGnlVaLcxUgQ8VweOk5HYdPvppocvKc7mkL0N8MX8fRIsVY2SdHM= Received: from BY1PR0201CA0005.namprd02.prod.outlook.com (10.160.191.143) by MWHPR02MB2749.namprd02.prod.outlook.com (10.175.49.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.639.5; Mon, 26 Sep 2016 18:29:05 +0000 Received: from BY2FFO11FD056.protection.gbl (2a01:111:f400:7c0c::190) by BY1PR0201CA0005.outlook.office365.com (2a01:111:e400:4814::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.639.5 via Frontend Transport; Mon, 26 Sep 2016 18:29:05 +0000 Authentication-Results: spf=pass (sender IP is 63.163.107.21) smtp.mailfrom=sandisk.com; redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=bestguesspass action=none header.from=sandisk.com; Received-SPF: Pass (protection.outlook.com: domain of sandisk.com designates 63.163.107.21 as permitted sender) receiver=protection.outlook.com; client-ip=63.163.107.21; helo=milsmgep15.sandisk.com; Received: from milsmgep15.sandisk.com (63.163.107.21) by BY2FFO11FD056.mail.protection.outlook.com (10.1.15.193) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.629.5 via Frontend Transport; Mon, 26 Sep 2016 18:29:00 +0000 Received: from MILHUBIP04.sdcorp.global.sandisk.com (Unknown_Domain [10.201.67.162]) (using TLS with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by (Symantec Messaging Gateway) with SMTP id 97.D8.26959.C9669E75; Mon, 26 Sep 2016 11:19:08 -0700 (PDT) Received: from milsmgip12.sandisk.com (10.177.8.100) by MILHUBIP04.sdcorp.global.sandisk.com (10.177.9.97) with Microsoft SMTP Server id 14.3.301.0; Mon, 26 Sep 2016 11:28:59 -0700 X-AuditID: 0ac94369-babff7000001694f-af-57e9669ce6de Received: from exp-402881.sandisk.com ( [10.177.8.100]) by (Symantec Messaging Gateway) with SMTP id 39.DF.03606.BE869E75; Mon, 26 Sep 2016 11:28:59 -0700 (PDT) Subject: [PATCH 9/9] [RFC] nvme: Fix a race condition To: Jens Axboe References: <7948dbb8-6333-dc62-2673-4da35b4dfdbc@sandisk.com> CC: Christoph Hellwig , James Bottomley , "Martin K. Petersen" , Mike Snitzer , Doug Ledford , Keith Busch , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-rdma@vger.kernel.org" , "linux-nvme@lists.infradead.org" From: Bart Van Assche Message-ID: <9c372b04-a194-58c4-a64f-b155b52a5244@sandisk.com> Date: Mon, 26 Sep 2016 11:28:59 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: <7948dbb8-6333-dc62-2673-4da35b4dfdbc@sandisk.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprPIsWRmVeSWpSXmKPExsXCddJ5ke6ctJfhBtOvGlr833OMzeLl+Q+s FitXH2WyWDUxz+Le0S9MFntvaVvMX/aU3eLZoV4Wi+7rO9gslh//x2TRtvErowO3x8Tmd+we i/e8ZPJ4cGgzi8fmJfUeu282sHl8fHqLxeP9vqtsHp83yQVwRHHZpKTmZJalFunbJXBlvJug V/CNu+LLyS3sDYxzuboYOTkkBEwk/l47ydbFyMUhJLCUSWLXwQ5GCGcHo8SN+8uBHA6wqvVH taGKGCW+rN/JChIXFjCV2P6nCGSQiICsxPfdr9lAbCEBO4lZs9vAhjILfGCWeNt7FCzBJmAk 8e39TBYQmxeoaOXjk6wgNouAqkT73D9MILaoQITErYcdUDWCEidnPgGzOQXsJV7f/cUMspdZ QFNi/S59kDCzgLzE9rdzmEF2SQj8ZJXYteQlI8QR6hInl8xnmsAoPAvJqFkI7bOQtC9gZF7F KJabmVOcm55aYGiqV5yYl5JZnK2XnJ+7iRESbZk7GO8+8T7EKMDBqMTD63H4ebgQa2JZcWXu IUYJDmYlEV7e9JfhQrwpiZVVqUX58UWlOanFhxilOViUxHnd7n0JExJITyxJzU5NLUgtgsky cXBKNTBefPhjf43ChD27LfcKPHNaueLHja8TlZt/ik1dbJjx2bvogvbUypPbJtRnlO5//e70 rPiUjKl7Lqu/v3rngHzdDw6ZkolWxevfeDxM/rmrwL6ZZYJEv57RndgSkboFizZqzpvfUbLW am+1s4+HbllQ6cvISS/btl/o3m6QMuHSoVRFBqEbipw3lFiKMxINtZiLihMB4FOXlLICAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprGLMWRmVeSWpSXmKPExsXCtZEjRfd1xstwg1kPJS3+7znGZvHy/AdW i5WrjzJZrJqYZ3Hv6Bcmi723tC3mL3vKbvHsUC+LRff1HWwWy4//Y7Jo2/iV0YHbY2LzO3aP xXteMnk8OLSZxWPzknqP3Tcb2Dw+Pr3F4vF+31U2j8+b5AI4orhsUlJzMstSi/TtErgy3k3Q K/jGXfHl5Bb2Bsa5XF2MHBwSAiYS649qdzFycQgJLGaUuHThHytIXFjAVGL7n6IuRk4OEQFZ ie+7X7OB2EICdhKzZrexgdQzC3xglui6c5UdJMEmYCTx7f1MFhCbF6ho5eOTrCA2i4CqRPvc P0wgtqhAhMSthx1QNYISJ2c+AbM5BewlXt/9xQxiMwuoS/yZdwnKlpfY/nYO8wRGvllIWmYh KZuFpGwBI/MqRrHczJzi3PTMAkMjveLEvJTM4my95PzcTYzgkOeM2sF4faL5IUYmDk6pBsZl 9p/e8Ec3i9eGpNlLPl8bIL3+VTDDpccPn+odnL3y5u7Jjf5beA/f6W9rPpXw9tt/1vePv02I zf5hsGGR7+TSe88/mm7fc96RhWf6F7u3Odv3TChac81a229H6tXw2Km7NU30Tzy6Lbrs+fw9 zsm3fok0ZNxgmc4wPevy7kunK/73zjkpwy0sqMRSnJFoqMVcVJwIAPesU/gpAgAA X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:63.163.107.21; 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Untested. Signed-off-by: Bart Van Assche Cc: Keith Busch Cc: Christoph Hellwig Cc: Sagi Grimberg --- drivers/nvme/host/core.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 057f1fa..6e2bf6a 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -201,13 +201,9 @@ fail: void nvme_requeue_req(struct request *req) { - unsigned long flags; - blk_mq_requeue_request(req); - spin_lock_irqsave(req->q->queue_lock, flags); - if (!blk_mq_queue_stopped(req->q)) - blk_mq_kick_requeue_list(req->q); - spin_unlock_irqrestore(req->q->queue_lock, flags); + WARN_ON_ONCE(blk_mq_queue_stopped(req->q)); + blk_mq_kick_requeue_list(req->q); } EXPORT_SYMBOL_GPL(nvme_requeue_req); @@ -2079,11 +2075,15 @@ EXPORT_SYMBOL_GPL(nvme_kill_queues); void nvme_stop_queues(struct nvme_ctrl *ctrl) { struct nvme_ns *ns; + struct request_queue *q; mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry(ns, &ctrl->namespaces, list) { - blk_mq_cancel_requeue_work(ns->queue); - blk_mq_stop_hw_queues(ns->queue); + q = ns->queue; + blk_quiesce_queue(q); + blk_mq_cancel_requeue_work(q); + blk_mq_stop_hw_queues(q); + blk_resume_queue(q); } mutex_unlock(&ctrl->namespaces_mutex); }