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| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2020-01-07 13:45:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-27 17:37:45 +0200 |
| commit | ae862e350a607cb7f290526a18393a3b49efd85c (patch) | |
| tree | eb5461770b63a0a75dd38485bfae0401400d4f47 /drivers/iio/adc | |
| parent | 90af01f6d9faa30367cbd0d09fbbbaa0ac0eea8e (diff) | |
| download | linux-stable-ae862e350a607cb7f290526a18393a3b49efd85c.tar.gz linux-stable-ae862e350a607cb7f290526a18393a3b49efd85c.tar.bz2 linux-stable-ae862e350a607cb7f290526a18393a3b49efd85c.zip | |
iio: adc: stm32-dfsdm: Use dma_request_chan() instead dma_request_slave_channel()
[ 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 <peter.ujfalusi@ti.com>
Acked-by: Olivier Moysan <olivier.moysan@st.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/iio/adc')
| -rw-r--r-- | drivers/iio/adc/stm32-dfsdm-adc.c | 10 |
1 files 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, |