From patchwork Thu Sep 29 00:02:50 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: 9355419 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 97F2A6077A for ; Thu, 29 Sep 2016 00:02:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 88A7F2969B for ; Thu, 29 Sep 2016 00:02:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7CA70296AD; Thu, 29 Sep 2016 00:02:59 +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=ham 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 CF6962969B for ; Thu, 29 Sep 2016 00:02:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754698AbcI2AC6 (ORCPT ); Wed, 28 Sep 2016 20:02:58 -0400 Received: from mail-by2nam03on0082.outbound.protection.outlook.com ([104.47.42.82]:35264 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753938AbcI2AC4 (ORCPT ); Wed, 28 Sep 2016 20:02:56 -0400 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=2L3kkYBnZHgk67WQWF7OQsG2zZAa5zbhCOg057eGgHw=; b=aHx2MW6F52KWCjF7hTHlQJstrDXdLwYzg2VN8SQsAnO8sipH37Npz2+7AwKeV/eYTiIz3et+bChFN0jKE8+L+Pbn6zYQ2VQhDuvtsyOPhdP6hy9yQg2glApbx0t4RZrfXunZmQ88PKiF2ildMyUTq4IF7YRDPXhsxXhEs4HTyMo= Received: from MWHPR02CA0007.namprd02.prod.outlook.com (10.168.209.145) by SN1PR02MB2144.namprd02.prod.outlook.com (10.166.68.18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.649.16; Thu, 29 Sep 2016 00:02:54 +0000 Received: from BL2FFO11FD015.protection.gbl (2a01:111:f400:7c09::121) by MWHPR02CA0007.outlook.office365.com (2603:10b6:300:4b::17) 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; Thu, 29 Sep 2016 00:02:53 +0000 Authentication-Results: spf=pass (sender IP is 63.163.107.225) smtp.mailfrom=sandisk.com; intel.com; dkim=none (message not signed) header.d=none;intel.com; dmarc=bestguesspass action=none header.from=sandisk.com; Received-SPF: Pass (protection.outlook.com: domain of sandisk.com designates 63.163.107.225 as permitted sender) receiver=protection.outlook.com; client-ip=63.163.107.225; helo=milsmgep14.sandisk.com; Received: from milsmgep14.sandisk.com (63.163.107.225) by BL2FFO11FD015.mail.protection.outlook.com (10.173.160.223) 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; Thu, 29 Sep 2016 00:02:52 +0000 Received: from MILHUBIP03.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 5A.9F.61581.F185CE75; Wed, 28 Sep 2016 16:54:07 -0700 (PDT) Received: from milsmgip11.sandisk.com (10.177.8.100) by MILHUBIP03.sdcorp.global.sandisk.com (10.177.9.96) with Microsoft SMTP Server id 14.3.301.0; Wed, 28 Sep 2016 17:02:51 -0700 X-AuditID: 0ac94371-5f3ff7000000f08d-2c-57ec581fc5d3 Received: from exp-402881.sandisk.com ( [10.177.8.100]) by (Symantec Messaging Gateway) with SMTP id 6B.A4.02783.A2A5CE75; Wed, 28 Sep 2016 17:02:51 -0700 (PDT) Subject: [PATCH v2 3/7] [RFC] nvme: Use BLK_MQ_S_STOPPED instead of QUEUE_FLAG_STOPPED in blk-mq code To: Jens Axboe References: 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: <9faa7607-eb3e-ce41-b09e-1e10492a5f45@sandisk.com> Date: Wed, 28 Sep 2016 17:02:50 -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: X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprDIsWRmVeSWpSXmKPExsXCddJ5ka58xJtwg/ZmLYv/e46xWbw8/4HV YuXqo0wWqybmWdw7+oXJYu8tbYv5y56yWzw71Mti0X19B5vF8uP/mCzaNn5ldOD2mNj8jt1j 8Z6XTB4PDm1m8di8pN5j980GNo+PT2+xeLzfd5XN4/MmuQCOKC6blNSczLLUIn27BK6Mlw+O MhYc56t4f8i1gfE0TxcjJ4eEgInE6kedrF2MXBxCAkuZJKb0r2IESQgJ7GCUaDmkBlM098NB RqgiRoktXd3sXYwcHMIC6RL9zf4gNSICshLfd79mg+i1k5g2vxmsnlngA7PE296jYAk2ASOJ b+9nsoD08gIVHfhRDRJmEVCVaDl2nQXEFhWIkLj1sAPM5hUQlDg58wlYOaeAvcT1pxogJrOA psT6XfogFcwC8hLb385hhrjyJ6vExAVcEBeoS5xcMp9pAqPwLCSDZiF0z0LSvYCReRWjWG5m TnFuemqBoYlecWJeSmZxtl5yfu4mRkicFe5gfH3b+xCjAAejEg+vwYnX4UKsiWXFlbmHGCU4 mJVEeF1C34QL8aYkVlalFuXHF5XmpBYfYpTmYFES570Y/TFMSCA9sSQ1OzW1ILUIJsvEwSnV wDhD3vbUrueeDYdkzogml/IwS2l1vLaPu5yz+EgaS77OzHXnPCL1frm13zK6aRR0rPu4rfr/ 2qr/S3o+1AUEvH7B9n7bk9PHU7Ycu3yaVVJBVsjhe6WD7XvxnfsaxTvbdWR694ryVLjtC34l tSGdwcHlhVHPlp8cKlHTS79yx82adOX+wklPNiuxFGckGmoxFxUnAgDY28XHrwIAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprKLMWRmVeSWpSXmKPExsXCtZEjRVc76k24wbZlOhb/9xxjs3h5/gOr xcrVR5ksVk3Ms7h39AuTxd5b2hbzlz1lt3h2qJfFovv6DjaL5cf/MVm0bfzK6MDtMbH5HbvH 4j0vmTweHNrM4rF5Sb3H7psNbB4fn95i8Xi/7yqbx+dNcgEcUVw2Kak5mWWpRfp2CVwZLx8c ZSw4zlfx/pBrA+Npni5GTg4JAROJuR8OMnYxcnEICSxmlPh/4ChbFyMHh7BAukR/sz9IjYiA rMT33a/ZQGwhATuJafObweqZBT4wS3TducoOkmATMJL49n4mC0gvL1DRgR/VIGEWAVWJlmPX WUBsUYEIiVsPO8BsXgFBiZMzn4CVcwrYS1x/qgESZhZQl/gz7xIzhC0vsf3tHOYJjHyzkHTM QlI2C0nZAkbmVYxiuZk5xbnpmQWGhnrFiXkpmcXZesn5uZsYwQHPGbmD8elE80OMTBycUg2M Zy8sPrjqjfnNZ+LbIwutWHPFzPnCwy/cSwx9mnouXO/ttUV9xlbrr2hbXV91pGXloyzh60fk N7Dayz1+uDFlP6NtZozzDzedu2vmv056mcDrcOj6s9+2p9atu3tLQD/YYsPWfPcN/DGKl7rd whbtrm496eldXtnYmf7q5QdGZc9tPr2vL9X/U2Ipzkg01GIuKk4EAJV/iMgoAgAA X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:63.163.107.225; 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Remove the QUEUE_FLAG_STOPPED manipulations that became superfluous because of this change. This patch fixes a race condition: using queue_flag_clear_unlocked() is not safe if any other function that manipulates the queue flags can be called concurrently, e.g. blk_cleanup_queue(). Untested. Signed-off-by: Bart Van Assche Cc: Keith Busch Cc: Christoph Hellwig Cc: Sagi Grimberg --- drivers/nvme/host/core.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 4669c05..d791fba 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -205,7 +205,7 @@ void nvme_requeue_req(struct request *req) blk_mq_requeue_request(req); spin_lock_irqsave(req->q->queue_lock, flags); - if (!blk_queue_stopped(req->q)) + if (!blk_mq_queue_stopped(req->q)) blk_mq_kick_requeue_list(req->q); spin_unlock_irqrestore(req->q->queue_lock, flags); } @@ -2080,10 +2080,6 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl) mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry(ns, &ctrl->namespaces, list) { - spin_lock_irq(ns->queue->queue_lock); - queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); - spin_unlock_irq(ns->queue->queue_lock); - blk_mq_cancel_requeue_work(ns->queue); blk_mq_stop_hw_queues(ns->queue); } @@ -2097,7 +2093,6 @@ void nvme_start_queues(struct nvme_ctrl *ctrl) mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry(ns, &ctrl->namespaces, list) { - queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); blk_mq_start_stopped_hw_queues(ns->queue, true); blk_mq_kick_requeue_list(ns->queue); }