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Petersen" To: linux-scsi@vger.kernel.org, adrian.hunter@intel.com, Asutosh Das , cang@codeaurora.org Cc: "Martin K . Petersen" , Matthias Brugger , "moderated list:ARM/Mediatek SoC support" , linux-arm-msm@vger.kernel.org, "moderated list:ARM/Mediatek SoC support" Subject: Re: [PATCH v21 0/2] Enable power management for ufs wlun Date: Mon, 10 May 2021 23:25:22 -0400 Message-Id: <162070348784.27567.14973100785851703779.b4-ty@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [138.3.201.9] X-ClientProxiedBy: SN4PR0501CA0144.namprd05.prod.outlook.com (2603:10b6:803:2c::22) To PH0PR10MB4759.namprd10.prod.outlook.com (2603:10b6:510:3d::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from ca-mkp.mkp.ca.oracle.com (138.3.201.9) by SN4PR0501CA0144.namprd05.prod.outlook.com (2603:10b6:803:2c::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4129.20 via Frontend Transport; Tue, 11 May 2021 03:25:37 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1f3dcb3e-487e-4cfd-13e1-08d9142c7278 X-MS-TrafficTypeDiagnostic: PH0PR10MB4408: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; 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That leads to a resume of the associated device which > is suspended. In ufs, that device is ufs device wlun and it's parent is > ufs_hba. This resume tries to resume ufs device wlun which in turn tries > to resume ufs_hba, which is already in the process of suspending, thus > causing a deadlock. > > [...] Applied to 5.14/scsi-queue, thanks! [1/2] scsi: ufs: Enable power management for wlun https://git.kernel.org/mkp/scsi/c/b294ff3e3449 [2/2] ufs: sysfs: Resume the proper scsi device https://git.kernel.org/mkp/scsi/c/aef80fd1da32 -- Martin K. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Fri, 23 Apr 2021 17:20:15 -0700, Asutosh Das wrote: > This patch attempts to fix a deadlock in ufs while sending SSU. > Recently, blk_queue_enter() added a check to not process requests if the > queue is suspended. That leads to a resume of the associated device which > is suspended. In ufs, that device is ufs device wlun and it's parent is > ufs_hba. This resume tries to resume ufs device wlun which in turn tries > to resume ufs_hba, which is already in the process of suspending, thus > causing a deadlock. > > [...] Applied to 5.14/scsi-queue, thanks! [1/2] scsi: ufs: Enable power management for wlun https://git.kernel.org/mkp/scsi/c/b294ff3e3449 [2/2] ufs: sysfs: Resume the proper scsi device https://git.kernel.org/mkp/scsi/c/aef80fd1da32 -- Martin K. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 23 Apr 2021 17:20:15 -0700, Asutosh Das wrote: > This patch attempts to fix a deadlock in ufs while sending SSU. > Recently, blk_queue_enter() added a check to not process requests if the > queue is suspended. That leads to a resume of the associated device which > is suspended. In ufs, that device is ufs device wlun and it's parent is > ufs_hba. This resume tries to resume ufs device wlun which in turn tries > to resume ufs_hba, which is already in the process of suspending, thus > causing a deadlock. > > [...] Applied to 5.14/scsi-queue, thanks! [1/2] scsi: ufs: Enable power management for wlun https://git.kernel.org/mkp/scsi/c/b294ff3e3449 [2/2] ufs: sysfs: Resume the proper scsi device https://git.kernel.org/mkp/scsi/c/aef80fd1da32 -- Martin K. Petersen Oracle Linux Engineering _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel