linux-kernel - [PATCH] iio: ad9523: fix a missing check of return value

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Message-Id: <20181220072122.40469-1-kjlu@umn.edu>
Date:   Thu, 20 Dec 2018 01:21:22 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iio: ad9523: fix a missing check of return value

If ad9523_write() fails, indio_dev may get incorrect data. The fix
inserts a check for the return value of ad9523_write(), and it fails,
returns an error.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/iio/frequency/ad9523.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c
index f3f94fbdd20a..3f9be69499ec 100644
--- a/drivers/iio/frequency/ad9523.c
+++ b/drivers/iio/frequency/ad9523.c
@@ -943,11 +943,14 @@ static int ad9523_setup(struct iio_dev *indio_dev)
 		}
 	}
 
-	for_each_clear_bit(i, &active_mask, AD9523_NUM_CHAN)
-		ad9523_write(indio_dev,
+	for_each_clear_bit(i, &active_mask, AD9523_NUM_CHAN) {
+		ret = ad9523_write(indio_dev,
 			     AD9523_CHANNEL_CLOCK_DIST(i),
 			     AD9523_CLK_DIST_DRIVER_MODE(TRISTATE) |
 			     AD9523_CLK_DIST_PWR_DOWN_EN);
+		if (ret < 0)
+			return ret;
+	}
 
 	ret = ad9523_write(indio_dev, AD9523_POWER_DOWN_CTRL, 0);
 	if (ret < 0)
-- 
2.17.2 (Apple Git-113)