ad7780: fix division by zero in ad7780_write_raw()

commit c174b53 upstream.

In the ad7780_write_raw() , val2 can be zero, which might lead to a
division by zero error in DIV_ROUND_CLOSEST(). The ad7780_write_raw()
is based on iio_info's write_raw. While val is explicitly declared that
can be zero (in read mode), val2 is not specified to be non-zero.

Fixes: 9085daa ("staging: iio: ad7780: add gain & filter gpio support")
Cc: [email protected]
Signed-off-by: Zicheng Qu <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Zicheng Qu

drivers/iio/adc/ad7780.c

@@ -152,7 +152,7 @@ static int ad7780_write_raw(struct iio_dev *indio_dev,
 
 	switch (m) {
 	case IIO_CHAN_INFO_SCALE:
-		if (val != 0)
+		if (val != 0 || val2 == 0)
 			return -EINVAL;
 
 		vref = st->int_vref_mv * 1000000LL;