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iio: adc: modify NPCM ADC read reference voltage

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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>
This commit is contained in:
Tomer Maimon 2019-04-07 11:19:28 +03:00 committed by Jonathan Cameron
parent 131ac62253
commit 4e63ed6b90
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/adc/npcm_adc.c
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@ -149,7 +149,7 @@ static int npcm_adc_read_raw(struct iio_dev *indio_dev,
} }
return IIO_VAL_INT; return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE: case IIO_CHAN_INFO_SCALE:
if (info->vref) { if (!IS_ERR(info->vref)) {
vref_uv = regulator_get_voltage(info->vref); vref_uv = regulator_get_voltage(info->vref);
*val = vref_uv / 1000; *val = vref_uv / 1000;
} else { } else {