Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: CNPjLB8U2r0Fgtaiknb/rAw4D8FmB18qWG1Z+oI3KGyXu5dOre4CcWcBl+6zAoMIHjIG2/zobi
 w4UC+FvyojqDARC7BXatwLvL/BUO7/6iCowmpsLeiFB8Qjrv+uaNcy0AKCQeNpZQGxG8DqwhLi
 tR7kK7RDVtClPBmvM0pvp1cmu4iMFcOxY55vQKtDcZno5BSzyMxVv2i4PScUg354Yur6WwClkq
 WE/en/jSYD/ycr/DReIoEzW6ss31Mlv450WSca7GgluiL/vxQMc6jJjvtFueKK0fG0BjImswA2
 w1A=
From:   Can Guo <cang@codeaurora.org>
To:     asutoshd@codeaurora.org, nguyenb@codeaurora.org,
        hongwus@codeaurora.org, rnayak@codeaurora.org,
        linux-scsi@vger.kernel.org, kernel-team@android.com,
        saravanak@google.com, salyzyn@google.com, cang@codeaurora.org
Cc:     Alim Akhtar <alim.akhtar@samsung.com>,
        Avri Altman <avri.altman@wdc.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Stanley Chu <stanley.chu@mediatek.com>,
        Bean Huo <beanhuo@micron.com>,
        Bart Van Assche <bvanassche@acm.org>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH V2 1/1] scsi: ufs: Fix a possible NULL pointer issue
Date:   Sun, 13 Dec 2020 19:41:32 -0800
Message-Id: <1607917296-11735-1-git-send-email-cang@codeaurora.org>
Precedence: bulk

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 | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index c1c401b..ef155a9 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8883,8 +8883,11 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
 	int ret = 0;
 	ktime_t start = ktime_get();
 
+	if (!hba)
+		return 0;
+
 	down(&hba->eh_sem);
-	if (!hba || !hba->is_powered)
+	if (!hba->is_powered)
 		return 0;
 
 	if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
@@ -8932,10 +8935,8 @@ 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))
 		/*
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.