[PATCH 1/1] scsi: ufs: Fix a possible NULL pointer issue

[Can Guo]

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 <c...@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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