Patch "scsi: ufs: core: WLUN suspend SSU/enter hibern8 fail recovery" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    scsi: ufs: core: WLUN suspend SSU/enter hibern8 fail recovery

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     scsi-ufs-core-wlun-suspend-ssu-enter-hibern8-fail-re.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 0cceeb7e85a809b6d3410ce006510967ea81f084
Author: Peter Wang <peter.wang@xxxxxxxxxxxx>
Date:   Thu Dec 8 15:25:20 2022 +0800

    scsi: ufs: core: WLUN suspend SSU/enter hibern8 fail recovery
    
    [ Upstream commit 1a5665fc8d7a000671ebd3fe69c6f9acf1e0dcd9 ]
    
    When SSU/enter hibern8 fail in WLUN suspend flow, trigger the error handler
    and return busy to break the suspend.  Otherwise the consumer will get
    stuck in runtime suspend status.
    
    Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun")
    Signed-off-by: Peter Wang <peter.wang@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20221208072520.26210-1-peter.wang@xxxxxxxxxxxx
    Reviewed-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
    Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
    Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
    Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index d1db6be80156..b048357d21e3 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -6094,6 +6094,14 @@ void ufshcd_schedule_eh_work(struct ufs_hba *hba)
 	}
 }
 
+static void ufshcd_force_error_recovery(struct ufs_hba *hba)
+{
+	spin_lock_irq(hba->host->host_lock);
+	hba->force_reset = true;
+	ufshcd_schedule_eh_work(hba);
+	spin_unlock_irq(hba->host->host_lock);
+}
+
 static void ufshcd_clk_scaling_allow(struct ufs_hba *hba, bool allow)
 {
 	down_write(&hba->clk_scaling_lock);
@@ -9066,6 +9074,15 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 
 		if (!hba->dev_info.b_rpm_dev_flush_capable) {
 			ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
+			if (ret && pm_op != UFS_SHUTDOWN_PM) {
+				/*
+				 * If return err in suspend flow, IO will hang.
+				 * Trigger error handler and break suspend for
+				 * error recovery.
+				 */
+				ufshcd_force_error_recovery(hba);
+				ret = -EBUSY;
+			}
 			if (ret)
 				goto enable_scaling;
 		}
@@ -9077,6 +9094,15 @@ static int __ufshcd_wl_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	 */
 	check_for_bkops = !ufshcd_is_ufs_dev_deepsleep(hba);
 	ret = ufshcd_link_state_transition(hba, req_link_state, check_for_bkops);
+	if (ret && pm_op != UFS_SHUTDOWN_PM) {
+		/*
+		 * If return err in suspend flow, IO will hang.
+		 * Trigger error handler and break suspend for
+		 * error recovery.
+		 */
+		ufshcd_force_error_recovery(hba);
+		ret = -EBUSY;
+	}
 	if (ret)
 		goto set_dev_active;