linux-kernel - [PATCH] iio: imu: adis: assign value only if return code zero in read funcs

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Message-ID: <20191030115511.28975-1-alexandru.ardelean@analog.com>
Date:   Wed, 30 Oct 2019 13:55:11 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>, <lars@...afoo.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH] iio: imu: adis: assign value only if return code zero in read funcs

The inline read functions in the ADIS library don't check the return value
of the `adis_read_reg()` function and assign the value of `tmp` regardless.

Fix this by checking if return value is zero and only then assigning the
value of `tmp`.

Fixes: 57a1228a06b7a ("iio:imu:adis: Add support for 32bit registers")
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 include/linux/iio/imu/adis.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index 4c53815bb729..92aae14593bf 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -129,7 +129,8 @@ static inline int adis_read_reg_16(struct adis *adis, unsigned int reg,
 	int ret;
 
 	ret = adis_read_reg(adis, reg, &tmp, 2);
-	*val = tmp;
+	if (ret == 0)
+		*val = tmp;
 
 	return ret;
 }
@@ -147,7 +148,8 @@ static inline int adis_read_reg_32(struct adis *adis, unsigned int reg,
 	int ret;
 
 	ret = adis_read_reg(adis, reg, &tmp, 4);
-	*val = tmp;
+	if (ret == 0)
+		*val = tmp;
 
 	return ret;
 }
-- 
2.20.1