linux-kernel - [PATCH 5.5 061/399] iio: imu: st_lsm6dsx: check return value from st_lsm6dsx_sensor_set

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Message-Id: <20200221072408.298365940@linuxfoundation.org>
Date:   Fri, 21 Feb 2020 08:36:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 061/399] iio: imu: st_lsm6dsx: check return value from st_lsm6dsx_sensor_set_enable

From: Lorenzo Bianconi <lorenzo@...nel.org>

[ Upstream commit a2dd9bd9334efb8dc0bdc0109abff3a7b57effb1 ]

Add missing return value check in st_lsm6dsx_read_oneshot disabling the
sensor. The issue is reported by coverity with the following error:

Unchecked return value:
If the function returns an error value, the error value may be mistaken
for a normal value.

Addresses-Coverity-ID: 1446733 ("Unchecked return value")
Fixes: b5969abfa8b8 ("iio: imu: st_lsm6dsx: add motion events")
Fixes: 290a6ce11d93 ("iio: imu: add support to lsm6dsx driver")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index b921dd9e108fa..e45123d8d2812 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -1506,8 +1506,11 @@ static int st_lsm6dsx_read_oneshot(struct st_lsm6dsx_sensor *sensor,
 	if (err < 0)
 		return err;
 
-	if (!hw->enable_event)
-		st_lsm6dsx_sensor_set_enable(sensor, false);
+	if (!hw->enable_event) {
+		err = st_lsm6dsx_sensor_set_enable(sensor, false);
+		if (err < 0)
+			return err;
+	}
 
 	*val = (s16)le16_to_cpu(data);
 
-- 
2.20.1