From: Peter Ujfalusi <[email protected]> [ Upstream commit a9ab624edd9186fbad734cfe5d606a6da3ca34db ]
dma_request_slave_channel() is a wrapper on top of dma_request_chan() eating up the error code. By using dma_request_chan() directly the driver can support deferred probing against DMA. Signed-off-by: Peter Ujfalusi <[email protected]> Acked-by: Olivier Moysan <[email protected]> Acked-by: Fabrice Gasnier <[email protected]> Signed-off-by: Jonathan Cameron <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- drivers/iio/adc/stm32-dfsdm-adc.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c index f5586dd6414d..516d7d22d9f4 100644 --- a/drivers/iio/adc/stm32-dfsdm-adc.c +++ b/drivers/iio/adc/stm32-dfsdm-adc.c @@ -933,9 +933,13 @@ static int stm32_dfsdm_dma_request(struct iio_dev *indio_dev) }; int ret; - adc->dma_chan = dma_request_slave_channel(&indio_dev->dev, "rx"); - if (!adc->dma_chan) - return -EINVAL; + adc->dma_chan = dma_request_chan(&indio_dev->dev, "rx"); + if (IS_ERR(adc->dma_chan)) { + int ret = PTR_ERR(adc->dma_chan); + + adc->dma_chan = NULL; + return ret; + } adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev, DFSDM_DMA_BUFFER_SIZE, -- 2.25.1
