linux-kernel - [PATCH AUTOSEL 4.9 38/62] iio: ad9523: Fix return value for ad952x

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Message-ID: <20180902131411.183978-28-alexander.levin@microsoft.com>
Date:   Sun, 2 Sep 2018 13:14:51 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Lars-Peter Clausen <lars@...afoo.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        "Stable@...r.kernel.org" <Stable@...r.kernel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 38/62] iio: ad9523: Fix return value for
 ad952x_store()

From: Lars-Peter Clausen <lars@...afoo.de>

[ Upstream commit 9a5094ca29ea9b1da301b31fd377c0c0c4c23034 ]

A sysfs write callback function needs to either return the number of
consumed characters or an error.

The ad952x_store() function currently returns 0 if the input value was "0",
this will signal that no characters have been consumed and the function
will be called repeatedly in a loop indefinitely. Fix this by returning
number of supplied characters to indicate that the whole input string has
been consumed.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Fixes: cd1678f96329 ("iio: frequency: New driver for AD9523 SPI Low Jitter Clock Generator")
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/iio/frequency/ad9523.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c
index 99eba524f6dd..26caf7cc1db9 100644
--- a/drivers/iio/frequency/ad9523.c
+++ b/drivers/iio/frequency/ad9523.c
@@ -508,7 +508,7 @@ static ssize_t ad9523_store(struct device *dev,
 		return ret;
 
 	if (!state)
-		return 0;
+		return len;
 
 	mutex_lock(&indio_dev->mlock);
 	switch ((u32)this_attr->address) {
-- 
2.17.1