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

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@mediatek.com>
Link: https://lore.kernel.org/r/20221208072520.26210-1-peter.wang@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 2dbe24977822f956383052144eac17b00ebab343..c63cd8bbe5c6d53d758d1d2ea68059fb0ac58aa3 100644 (file)
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -6056,6 +6056,14 @@ 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);
@@ -9083,6 +9091,15 @@ 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;
                }
@@ -9094,6 +9111,15 @@ 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;