* [PATCH 1/1] scsi: ufs: Fix a possible NULL pointer issue
@ 2020-12-14 2:05 Can Guo
0 siblings, 0 replies; only message in thread
From: Can Guo @ 2020-12-14 2:05 UTC (permalink / raw)
To: asutoshd, nguyenb, hongwus, rnayak, linux-scsi, kernel-team,
saravanak, salyzyn, cang
Cc: Alim Akhtar, Avri Altman, James E.J. Bottomley,
Martin K. Petersen, Stanley Chu, Bean Huo, Bart Van Assche,
open list
During system resume/suspend, hba could be NULL. In this case, do not touch
eh_sem.
Fixes: 88a92d6ae4fe ("scsi: ufs: Serialize eh_work with system PM events and async scan")
Signed-off-by: Can Guo <cang@codeaurora.org>
---
drivers/scsi/ufs/ufshcd.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index c1c401b..140394a 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8883,9 +8883,13 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
int ret = 0;
ktime_t start = ktime_get();
- down(&hba->eh_sem);
- if (!hba || !hba->is_powered)
+ if (!hba)
+ return 0;
+
+ if (!hba->is_powered) {
+ down(&hba->eh_sem);
return 0;
+ }
if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
hba->curr_dev_pwr_mode) &&
@@ -8932,10 +8936,8 @@ int ufshcd_system_resume(struct ufs_hba *hba)
int ret = 0;
ktime_t start = ktime_get();
- if (!hba) {
- up(&hba->eh_sem);
+ if (!hba)
return -EINVAL;
- }
if (!hba->is_powered || pm_runtime_suspended(hba->dev))
/*
--
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