linux-kernel - [PATCH] scsi: ufs: fix a missing check of devm_reset_control

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Message-Id: <20190314063749.13907-1-kjlu@umn.edu>
Date:   Thu, 14 Mar 2019 01:37:49 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Vinayak Holikatti <vinholikatti@...il.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: ufs: fix a missing check of devm_reset_control_get

devm_reset_control_get could fail, so the fix checks its
return value and pass the error code upstream in case it fails.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/scsi/ufs/ufs-hisi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/ufs/ufs-hisi.c b/drivers/scsi/ufs/ufs-hisi.c
index 452e19f8fb47..ce9d7c40909f 100644
--- a/drivers/scsi/ufs/ufs-hisi.c
+++ b/drivers/scsi/ufs/ufs-hisi.c
@@ -544,6 +544,11 @@ static int ufs_hisi_init_common(struct ufs_hba *hba)
 	ufshcd_set_variant(hba, host);
 
 	host->rst  = devm_reset_control_get(dev, "rst");
+	if (IS_ERR(host->rst)) {
+		dev_err(dev, "%s: failed to get reset control\n",
+			__func__);
+		return PTR_ERR(host->rst);
+	}
 
 	ufs_hisi_set_pm_lvl(hba);
 
-- 
2.17.1