[PATCH] spi: mxs: Use dma_request_chan() instead dma_request_slave_channel()

From: Peter Ujfalusi
Date: Thu Dec 12 2019 - 08:55:46 EST


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@xxxxxx>
Link: https://lore.kernel.org/r/20191212135550.4634-6-peter.ujfalusi@xxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/spi/spi-mxs.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c
index 996c1c8a9c71..dce85ee07cd0 100644
--- a/drivers/spi/spi-mxs.c
+++ b/drivers/spi/spi-mxs.c
@@ -590,10 +590,10 @@ static int mxs_spi_probe(struct platform_device *pdev)
if (ret)
goto out_master_free;

- ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
- if (!ssp->dmach) {
+ ssp->dmach = dma_request_chan(&pdev->dev, "rx-tx");
+ if (IS_ERR(ssp->dmach)) {
dev_err(ssp->dev, "Failed to request DMA\n");
- ret = -ENODEV;
+ ret = PTR_ERR(ssp->dmach);
goto out_master_free;
}

--
2.20.1