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

Olivier Moysan
2021-11-22T14:40:56Z

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>
---
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)
--
2.17.1