lkml.org 
[lkml]   [2020]   [Dec]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/3] scsi: ufs: Let resume callback return -EBUSY after ufshcd_shutdown
Date
From: Bean Huo <beanhuo@micron.com>

After ufshcd_shutdown(), both UFS device and UFS LINk are powered off,
return '0' will mislead the upper PM layer since the device has not been
successfully resumed yet. This will let pm_runtime_get_sync() caller
mistakenly believe the device/LINK has been resumed, which leads to
request processing timeout that was en-queued later.

To fix this, let ufshcd_system/runtimie_resume() return -EBUSY in case of
hba->is_powered == false.

Signed-off-by: Bean Huo <beanhuo@micron.com>
---
drivers/scsi/ufs/ufshcd.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index e221add25a7e..e1bcac51c01f 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8950,14 +8950,16 @@ int ufshcd_system_resume(struct ufs_hba *hba)
return -EINVAL;
}

- if (!hba->is_powered || pm_runtime_suspended(hba->dev))
+ if (!hba->is_powered || pm_runtime_suspended(hba->dev)) {
/*
* Let the runtime resume take care of resuming
* if runtime suspended.
*/
+ ret = -EBUSY;
goto out;
- else
+ } else {
ret = ufshcd_resume(hba, UFS_SYSTEM_PM);
+ }
out:
trace_ufshcd_system_resume(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
@@ -9026,10 +9028,12 @@ int ufshcd_runtime_resume(struct ufs_hba *hba)
if (!hba)
return -EINVAL;

- if (!hba->is_powered)
+ if (!hba->is_powered) {
+ ret = -EBUSY;
goto out;
- else
+ } else {
ret = ufshcd_resume(hba, UFS_RUNTIME_PM);
+ }
out:
trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
ktime_to_us(ktime_sub(ktime_get(), start)),
--
2.17.1
\
 
 \ /
  Last update: 2020-12-24 18:22    [W:0.127 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site