iio:ad7923: Return error if we didn't get the expected result

Instead of leaving 'val' uninitialized return an error if the result's address
did not match that of the channel we were trying to read.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Patrick Vasseur <patrick.vasseur@c-s.fr>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 766c74026be208ff6316026ef991204c4971d634..36eee248a9f6bddda205905c1ef8a5884221cb32 100644 (file)
--- a/drivers/iio/adc/ad7923.c
+++ b/drivers/iio/adc/ad7923.c
@@ -199,6 +199,8 @@ static int ad7923_read_raw(struct iio_dev *indio_dev,
 
                if (chan->address == EXTRACT(ret, 12, 4))
                        *val = EXTRACT(ret, 0, 12);
+               else
+                       return -EIO;
 
                return IIO_VAL_INT;
        }