Re: [PATCH v2] iio: adc: stm32: fix null pointer on defer_probe error
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
Date: 2021-11-22 14:41:20
Also in:
linux-iio, lkml
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>
quoted hunk ↗ jump to hunk
--- 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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