From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C6122396B75; Thu, 15 Jan 2026 16:54:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768496057; cv=none; b=cm3GcddCcZapqpn3Et/jd1CqahOTrc7Xk7NEHaCCceLo5JsyR5LC5kD10GJvSiHwVtq385vx/20QvKj5CktHONbxERrAP3gTPRJ2EH6B4B3Kcie9ANxsFNd2/HQ5c+adgJUxVgy5IrA3G2Ey+0fIQt4Xpt3K5DJlINqvUmgB/4c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768496057; c=relaxed/simple; bh=q14H+rPWkd+gcS2Niq4DPYQS3sfpaaPBcpIXhQz77qo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DRgewaHij5tgFEJnm17/gruaH2OqlDJSbq/qZA/Qoy+IGcpYFQErqyXp/A7RJwgKDTK57cMXAyRsLkknKAfDr29oGAb1lbR5QmBwtT44Caycgqho5MbAhUd2ScelgXbvYNYi7KGUhtFoGnsMFt1iigaTaGey+cFh7vd+3aMpEeI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=e1kGpw9p; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="e1kGpw9p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5210DC116D0; Thu, 15 Jan 2026 16:54:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768496057; bh=q14H+rPWkd+gcS2Niq4DPYQS3sfpaaPBcpIXhQz77qo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e1kGpw9ps1RRjt2mvNKQYoPMyOV0qSF2GER6l40ZngEOjMm78GVsoAx7ROELPd0WO Qk53ohHbxgmDnB25Vib3YGODnnBlnJVFnPwA5RHZ+zU5btR9Y2rtZF2RAod1uZNQMu MTfcldy/dl3dPKW0afByjVjTsLu7XLlZSBaWYGK8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Brian Kao , Bart Van Assche , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 6.18 062/181] scsi: ufs: core: Fix EH failure after W-LUN resume error Date: Thu, 15 Jan 2026 17:46:39 +0100 Message-ID: <20260115164204.565953924@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164202.305475649@linuxfoundation.org> References: <20260115164202.305475649@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Brian Kao [ Upstream commit b4bb6daf4ac4d4560044ecdd81e93aa2f6acbb06 ] When a W-LUN resume fails, its parent devices in the SCSI hierarchy, including the scsi_target, may be runtime suspended. Subsequently, the error handler in ufshcd_recover_pm_error() fails to set the W-LUN device back to active because the parent target is not active. This results in the following errors: google-ufshcd 3c2d0000.ufs: ufshcd_err_handler started; HBA state eh_fatal; ... ufs_device_wlun 0:0:0:49488: START_STOP failed for power mode: 1, result 40000 ufs_device_wlun 0:0:0:49488: ufshcd_wl_runtime_resume failed: -5 ... ufs_device_wlun 0:0:0:49488: runtime PM trying to activate child device 0:0:0:49488 but parent (target0:0:0) is not active Address this by: 1. Ensuring the W-LUN's parent scsi_target is runtime resumed before attempting to set the W-LUN to active within ufshcd_recover_pm_error(). 2. Explicitly checking for power.runtime_error on the HBA and W-LUN devices before calling pm_runtime_set_active() to clear the error state. 3. Adding pm_runtime_get_sync(hba->dev) in ufshcd_err_handling_prepare() to ensure the HBA itself is active during error recovery, even if a child device resume failed. These changes ensure the device power states are managed correctly during error recovery. Signed-off-by: Brian Kao Tested-by: Brian Kao Reviewed-by: Bart Van Assche Link: https://patch.msgid.link/20251112063214.1195761-1-powenkao@google.com Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/ufs/core/ufshcd.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index ba1bb3953cf69..022810b524e96 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -6498,6 +6498,11 @@ static void ufshcd_clk_scaling_suspend(struct ufs_hba *hba, bool suspend) static void ufshcd_err_handling_prepare(struct ufs_hba *hba) { + /* + * A WLUN resume failure could potentially lead to the HBA being + * runtime suspended, so take an extra reference on hba->dev. + */ + pm_runtime_get_sync(hba->dev); ufshcd_rpm_get_sync(hba); if (pm_runtime_status_suspended(&hba->ufs_device_wlun->sdev_gendev) || hba->is_sys_suspended) { @@ -6537,6 +6542,7 @@ static void ufshcd_err_handling_unprepare(struct ufs_hba *hba) if (ufshcd_is_clkscaling_supported(hba)) ufshcd_clk_scaling_suspend(hba, false); ufshcd_rpm_put(hba); + pm_runtime_put(hba->dev); } static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba) @@ -6551,28 +6557,42 @@ static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba) #ifdef CONFIG_PM static void ufshcd_recover_pm_error(struct ufs_hba *hba) { + struct scsi_target *starget = hba->ufs_device_wlun->sdev_target; struct Scsi_Host *shost = hba->host; struct scsi_device *sdev; struct request_queue *q; - int ret; + bool resume_sdev_queues = false; hba->is_sys_suspended = false; + /* - * Set RPM status of wlun device to RPM_ACTIVE, - * this also clears its runtime error. + * Ensure the parent's error status is cleared before proceeding + * to the child, as the parent must be active to activate the child. */ - ret = pm_runtime_set_active(&hba->ufs_device_wlun->sdev_gendev); + if (hba->dev->power.runtime_error) { + /* hba->dev has no functional parent thus simplily set RPM_ACTIVE */ + pm_runtime_set_active(hba->dev); + resume_sdev_queues = true; + } + + if (hba->ufs_device_wlun->sdev_gendev.power.runtime_error) { + /* + * starget, parent of wlun, might be suspended if wlun resume failed. + * Make sure parent is resumed before set child (wlun) active. + */ + pm_runtime_get_sync(&starget->dev); + pm_runtime_set_active(&hba->ufs_device_wlun->sdev_gendev); + pm_runtime_put_sync(&starget->dev); + resume_sdev_queues = true; + } - /* hba device might have a runtime error otherwise */ - if (ret) - ret = pm_runtime_set_active(hba->dev); /* * If wlun device had runtime error, we also need to resume those * consumer scsi devices in case any of them has failed to be * resumed due to supplier runtime resume failure. This is to unblock * blk_queue_enter in case there are bios waiting inside it. */ - if (!ret) { + if (resume_sdev_queues) { shost_for_each_device(sdev, shost) { q = sdev->request_queue; if (q->dev && (q->rpm_status == RPM_SUSPENDED || -- 2.51.0