[PATCH 4.19 16/90] scsi: ufs: Avoid runtime suspend possibly being blocked forever

From: Greg Kroah-Hartman
Date: Mon Jun 24 2019 - 06:04:45 EST

From: Stanley Chu <stanley.chu@xxxxxxxxxxxx>

commit 24e2e7a19f7e4b83d0d5189040d997bce3596473 upstream.

UFS runtime suspend can be triggered after pm_runtime_enable() is invoked
in ufshcd_pltfrm_init(). However if the first runtime suspend is triggered
before binding ufs_hba structure to ufs device structure via
platform_set_drvdata(), then UFS runtime suspend will be no longer
triggered in the future because its dev->power.runtime_error was set in the
first triggering and does not have any chance to be cleared.

To be more clear, dev->power.runtime_error is set if hba is NULL in
ufshcd_runtime_suspend() which returns -EINVAL to rpm_callback() where
dev->power.runtime_error is set as -EINVAL. In this case, any future
rpm_suspend() for UFS device fails because rpm_check_suspend_allowed()
fails due to non-zero

To resolve this issue, make sure the first UFS runtime suspend get valid
"hba" in ufshcd_runtime_suspend(): Enable UFS runtime PM only after hba is
successfully bound to UFS device structure.

Fixes: 62694735ca95 ([SCSI] ufs: Add runtime PM support for UFS host controller driver)
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/scsi/ufs/ufshcd-pltfrm.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)

--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -340,24 +340,21 @@ int ufshcd_pltfrm_init(struct platform_d
goto dealloc_host;

- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);

err = ufshcd_init(hba, mmio_base, irq);
if (err) {
dev_err(dev, "Initialization failed\n");
- goto out_disable_rpm;
+ goto dealloc_host;

platform_set_drvdata(pdev, hba);

+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
return 0;

- pm_runtime_disable(&pdev->dev);
- pm_runtime_set_suspended(&pdev->dev);