scsi: ufs: Fix race between shutdown and runtime resume flow

[ Upstream commit e92643db514803c2c87d72caf5950b4c0a8faf4a ]

If UFS host device is in runtime-suspended state while UFS shutdown
callback is invoked, UFS device shall be resumed for register
accesses. Currently only UFS local runtime resume function will be invoked
to wake up the host.  This is not enough because if someone triggers
runtime resume from block layer, then race may happen between shutdown and
runtime resume flow, and finally lead to unlocked register access.

To fix this, in ufshcd_shutdown(), use pm_runtime_get_sync() instead of
resuming UFS device by ufshcd_runtime_resume() "internally" to let runtime
PM framework manage the whole resume flow.

Link: https://lore.kernel.org/r/20201119062916.12931-1-stanley.chu@mediatek.com
Fixes: 57d104c153d3 ("ufs: add UFS power management support")
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ad5f2e2b4cbaf0be70c3f6dd84cda8b9816a59e5..ad80e4223c2d3afa60bae819b368daf835edecc9 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6521,11 +6521,7 @@ int ufshcd_shutdown(struct ufs_hba *hba)
        if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
                goto out;
 
-       if (pm_runtime_suspended(hba->dev)) {
-               ret = ufshcd_runtime_resume(hba);
-               if (ret)
-                       goto out;
-       }
+       pm_runtime_get_sync(hba->dev);
 
        ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM);
 out: