From bd1d558c9c65cf56623a3a237a2998697586c409 Mon Sep 17 00:00:00 2001 From: Martin Larsson Date: Wed, 20 Jul 2022 15:31:54 +0000 Subject: [PATCH] iio: adc: imx8qxp-adc: propagate regulator_get_voltage error If the ADC vref regulator returns an error, for example, if CONFIG_REGULATOR is not set, the error will be used as a reference voltage. Introduce a guard for negative return values instead of unconditionally casting it to u32. Acked-by: Haibo Chen Signed-off-by: Martin Larsson Reviewed-by: Fabio Estevam Link: https://lore.kernel.org/r/20220720153136.3502440-1-martin.larsson@actia.se Signed-off-by: Jonathan Cameron --- drivers/iio/adc/imx8qxp-adc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/imx8qxp-adc.c b/drivers/iio/adc/imx8qxp-adc.c index e48446784a0a..36777b827165 100644 --- a/drivers/iio/adc/imx8qxp-adc.c +++ b/drivers/iio/adc/imx8qxp-adc.c @@ -202,7 +202,7 @@ static int imx8qxp_adc_read_raw(struct iio_dev *indio_dev, struct imx8qxp_adc *adc = iio_priv(indio_dev); struct device *dev = adc->dev; - u32 ctrl, vref_uv; + u32 ctrl; long ret; switch (mask) { @@ -245,8 +245,10 @@ static int imx8qxp_adc_read_raw(struct iio_dev *indio_dev, return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: - vref_uv = regulator_get_voltage(adc->vref); - *val = vref_uv / 1000; + ret = regulator_get_voltage(adc->vref); + if (ret < 0) + return ret; + *val = ret / 1000; *val2 = 12; return IIO_VAL_FRACTIONAL_LOG2;