From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 9AE34C433E0 for ; Wed, 27 Jan 2021 04:49:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A4CE2070E for ; Wed, 27 Jan 2021 04:49:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239434AbhA0Eo5 (ORCPT ); Tue, 26 Jan 2021 23:44:57 -0500 Received: from labrats.qualcomm.com ([199.106.110.90]:31467 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238229AbhA0EJX (ORCPT ); Tue, 26 Jan 2021 23:09:23 -0500 IronPort-SDR: A0VjZ20FM29nhAGpEObYJz9jL8kyjchB1BIXJhZ+T2zi7ZVSXOLLtMmVN6MU0HPWGxZmCRYLX3 z/APdQ+x4Ok8nogysGjy0CFxbi45ypqEPqXwiUXcrLqHf9QGAszvf58wtIF8BgY070l3PBvjpc O6F/eM3/8zVwn6fHqJf0byNtfQIKZ//1dw61RJudE3+TnrcR6iA/Dx4gsGMCezEFLNwWVbn+to nVm7B4IvDD6UMulXzku9arxqdb1GsfuK979oO7pEV0xB96lxX1KR5WzJm1ILtWK0kTWjtx5w0D lrA= X-IronPort-AV: E=Sophos;i="5.79,378,1602572400"; d="scan'208";a="47711300" Received: from unknown (HELO ironmsg05-sd.qualcomm.com) ([10.53.140.145]) by labrats.qualcomm.com with ESMTP; 26 Jan 2021 20:00:32 -0800 X-QCInternal: smtphost Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg05-sd.qualcomm.com with ESMTP; 26 Jan 2021 20:00:31 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 92687) id A76D721903; Tue, 26 Jan 2021 20:00:31 -0800 (PST) From: Asutosh Das To: cang@codeaurora.org, martin.petersen@oracle.com, linux-scsi@vger.kernel.org Cc: Asutosh Das , linux-arm-msm@vger.kernel.org, stern@rowland.harvard.edu, "Bao D . Nguyen" , Alim Akhtar , Avri Altman , "James E.J. Bottomley" , Stanley Chu , Bean Huo , linux-kernel@vger.kernel.org (open list) Subject: [RFC PATCH v1 2/2] scsi: ufs: Fix deadlock while suspending ufs host Date: Tue, 26 Jan 2021 20:00:23 -0800 Message-Id: <7929cc67311133f8dbdfe5e627cf6a2f1daa486e.1611719814.git.asutoshd@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org During runtime-suspend of ufs host, the scsi devices are already suspended and so are the queues associated with them. But the ufs host sends SSU to wlun during its runtime-suspend. During the process blk_queue_enter checks if the queue is not in suspended state. If so, it waits for the queue to resume, and never comes out of it. The commit (d55d15a33: scsi: block: Do not accept any requests while suspended) adds the check if the queue is in suspended state in blk_queue_enter(). Fix this, by decoupling wlun scsi devices from block layer pm. The runtime-pm for these devices would be managed by bsg and sg drivers. Call trace: __switch_to+0x174/0x2c4 __schedule+0x478/0x764 schedule+0x9c/0xe0 blk_queue_enter+0x158/0x228 blk_mq_alloc_request+0x40/0xa4 blk_get_request+0x2c/0x70 __scsi_execute+0x60/0x1c4 ufshcd_set_dev_pwr_mode+0x124/0x1e4 ufshcd_suspend+0x208/0x83c ufshcd_runtime_suspend+0x40/0x154 ufshcd_pltfrm_runtime_suspend+0x14/0x20 pm_generic_runtime_suspend+0x28/0x3c __rpm_callback+0x80/0x2a4 rpm_suspend+0x308/0x614 rpm_idle+0x158/0x228 pm_runtime_work+0x84/0xac process_one_work+0x1f0/0x470 worker_thread+0x26c/0x4c8 kthread+0x13c/0x320 ret_from_fork+0x10/0x18 Change-Id: Id777fd52493c8b5522d1ebcad73cd30dac33e8a4 Signed-off-by: Asutosh Das Signed-off-by: Can Guo Signed-off-by: Bao D. Nguyen --- drivers/scsi/ufs/ufshcd.c | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 9c691e4..b7e7f81 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -7217,16 +7217,6 @@ static void ufshcd_set_active_icc_lvl(struct ufs_hba *hba) kfree(desc_buf); } -static inline void ufshcd_blk_pm_runtime_init(struct scsi_device *sdev) -{ - scsi_autopm_get_device(sdev); - blk_pm_runtime_init(sdev->request_queue, &sdev->sdev_gendev); - if (sdev->rpm_autosuspend) - pm_runtime_set_autosuspend_delay(&sdev->sdev_gendev, - RPM_AUTOSUSPEND_DELAY_MS); - scsi_autopm_put_device(sdev); -} - /** * ufshcd_scsi_add_wlus - Adds required W-LUs * @hba: per-adapter instance @@ -7265,7 +7255,6 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba) hba->sdev_ufs_device = NULL; goto out; } - ufshcd_blk_pm_runtime_init(hba->sdev_ufs_device); scsi_device_put(hba->sdev_ufs_device); hba->sdev_rpmb = __scsi_add_device(hba->host, 0, 0, @@ -7274,17 +7263,14 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba) ret = PTR_ERR(hba->sdev_rpmb); goto remove_sdev_ufs_device; } - ufshcd_blk_pm_runtime_init(hba->sdev_rpmb); scsi_device_put(hba->sdev_rpmb); sdev_boot = __scsi_add_device(hba->host, 0, 0, ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL); - if (IS_ERR(sdev_boot)) { + if (IS_ERR(sdev_boot)) dev_err(hba->dev, "%s: BOOT WLUN not found\n", __func__); - } else { - ufshcd_blk_pm_runtime_init(sdev_boot); + else scsi_device_put(sdev_boot); - } goto out; remove_sdev_ufs_device: -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.