iio: adc: modify NPCM ADC read reference voltage

Checking if regulator is valid before reading NPCM ADC regulator voltage to avoid system crash in a case the regulator is not valid. Signed-off-by: Tomer Maimon <tmaimon77@gmail.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
mariux64 · Apr 7, 2019 · 4e63ed6 · 4e63ed6
1 parent 131ac62
commit 4e63ed6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/iio/adc/npcm_adc.c b/drivers/iio/adc/npcm_adc.c
@@ -149,7 +149,7 @@ static int npcm_adc_read_raw(struct iio_dev *indio_dev,
 		}
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
-		if (info->vref) {
+		if (!IS_ERR(info->vref)) {
 			vref_uv = regulator_get_voltage(info->vref);
 			*val = vref_uv / 1000;
 		} else {