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
dev->power.runtime_error.
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>
---
drivers/scsi/ufs/ufshcd-pltfrm.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 8a74ec30c3d2..d7d521b394c3 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -430,24 +430,21 @@ int ufshcd_pltfrm_init(struct platform_device *pdev,
goto dealloc_host;
}
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
-
ufshcd_init_lanes_per_dir(hba);
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;
-out_disable_rpm:
- pm_runtime_disable(&pdev->dev);
- pm_runtime_set_suspended(&pdev->dev);
dealloc_host:
ufshcd_dealloc_host(hba);
out:
--
2.18.0
