Re: [PATCH v2] iio: adc: stm32: fix null pointer on defer_probe error

Ahmad Fatoum
2021-11-22T14:42:47Z

On 22.11.21 15:38, Olivier Moysan wrote:
> dev_err_probe() calls __device_set_deferred_probe_reason()
> on -EPROBE_DEFER error. If device pointer to driver core
> private structure is not initialized, an null pointer error occurs.
> This pointer is set on iio_device_register() call for iio device.
>
> dev_err_probe() must be called with the device which is probing.
> Replace iio device by its parent device.
>
> Fixes: 0e346b2cfa85 ("iio: adc: stm32-adc: add vrefint calibration support")
>
> Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> ---
> Changes in v2:
> - Use parent device from indio_dev instead of private structure
> ---
> drivers/iio/adc/stm32-adc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
> index 7f1fb36c747c..341afdd342cc 100644
> --- a/drivers/iio/adc/stm32-adc.c
> +++ b/drivers/iio/adc/stm32-adc.c
> @@ -1986,7 +1986,7 @@ static int stm32_adc_populate_int_ch(struct iio_dev *indio_dev, const char *ch_n
> /* Get calibration data for vrefint channel */
> ret = nvmem_cell_read_u16(&indio_dev->dev, "vrefint", &vrefint);
> if (ret && ret != -ENOENT) {
> - return dev_err_probe(&indio_dev->dev, ret,
> + return dev_err_probe(indio_dev->dev.parent, ret,
> "nvmem access error\n");
> }
> if (ret == -ENOENT)
>

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