From: Tomer Maimon <tmaimon77@gmail.com>
Date: Sun, 7 Apr 2019 08:19:28 +0000 (+0300)
Subject: iio: adc: modify NPCM ADC read reference voltage
X-Git-Tag: v5.2-rc3~22^2~9^2~4
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=4e63ed6b90803eeb400c392e9ff493200d926b06;p=linux.git

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>
---

diff --git a/drivers/iio/adc/npcm_adc.c b/drivers/iio/adc/npcm_adc.c
index 9e25bbec9c70..193b3b81de4d 100644
--- 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 {