[PATCH 3.16 083/328] iio: ad9523: Fix return value for ad952x_store()

Ben Hutchings
2018-12-09T22:08:48Z

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

commit 9a5094ca29ea9b1da301b31fd377c0c0c4c23034 upstream.

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@metafoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Fixes: cd1678f96329 ("iio: frequency: New driver for AD9523 SPI Low Jitter Clock Generator")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/iio/frequency/ad9523.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/frequency/ad9523.c
+++ b/drivers/iio/frequency/ad9523.c
@@ -507,7 +507,7 @@ static ssize_t ad9523_store(struct devic
return ret;

if (!state)
- return 0;
+ return len;

mutex_lock(&indio_dev->mlock);
switch ((u32)this_attr->address) {