releases/5.1.8/iio-adc-modify-npcm-adc-read-reference-voltage.patch

   1 From 4e63ed6b90803eeb400c392e9ff493200d926b06 Mon Sep 17 00:00:00 2001
   2 From: Tomer Maimon <tmaimon77@gmail.com>
   3 Date: Sun, 7 Apr 2019 11:19:28 +0300
   4 Subject: iio: adc: modify NPCM ADC read reference voltage
   5
   6 From: Tomer Maimon <tmaimon77@gmail.com>
   7
   8 commit 4e63ed6b90803eeb400c392e9ff493200d926b06 upstream.
   9
  10 Checking if regulator is valid before reading
  11 NPCM ADC regulator voltage to avoid system crash
  12 in a case the regulator is not valid.
  13
  14 Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
  15 Cc: <Stable@vger.kernel.org>
  16 Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18
  19 ---
  20  drivers/iio/adc/npcm_adc.c |    2 +-
  21  1 file changed, 1 insertion(+), 1 deletion(-)
  22
  23 --- a/drivers/iio/adc/npcm_adc.c
  24 +++ b/drivers/iio/adc/npcm_adc.c
  25 @@ -149,7 +149,7 @@ static int npcm_adc_read_raw(struct iio_
  26                 }
  27                 return IIO_VAL_INT;
  28         case IIO_CHAN_INFO_SCALE:
  29 -               if (info->vref) {
  30 +               if (!IS_ERR(info->vref)) {
  31                         vref_uv = regulator_get_voltage(info->vref);
  32                         *val = vref_uv / 1000;
  33                 } else {