4.18-stable review patch. If anyone has any objections, please let me know.
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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") Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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 @@ -508,7 +508,7 @@ 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) {