| Message ID | 20211122143809.2332-1-olivier.moysan@foss.st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] iio: adc: stm32: fix null pointer on defer_probe error | expand |
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) >
On Mon, 22 Nov 2021 15:41:10 +0100 Ahmad Fatoum <a.fatoum@pengutronix.de> wrote: > 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") > > I'll fix it when applying, but no blank line between Fixes tag and the others. > > 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) > > > >
On Mon, 22 Nov 2021 14:45:01 +0000 Jonathan Cameron <Jonathan.Cameron@Huawei.com> wrote: > On Mon, 22 Nov 2021 15:41:10 +0100 > Ahmad Fatoum <a.fatoum@pengutronix.de> wrote: > > > 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") > > > > > I'll fix it when applying, but no blank line between Fixes tag and the others. Applied to the fixes-togreg branch of iio.git. I'll probably do a pull request later this week, Jonathan > > > > 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) > > > > > > > >
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)
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(-)