spi: mxs: Use dma_request_chan() instead dma_request_slave_channel()

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>
Link: https://lore.kernel.org/r/20191212135550.4634-6-peter.ujfalusi@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c
index 996c1c8a9c719e77372c0358025eaa7ed193d232..dce85ee07cd0023de15d3d240464a329e44e533f 100644 (file)
--- 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;
        }