DMA-API: dma: dw_dmac.c: convert to use dma_coerce_mask_and_coherent()

This code sequence:
	if (!pdev->dev.dma_mask) {
		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
	}
bypasses the architectures check on the DMA mask.  It can be replaced
with dma_coerce_mask_and_coherent(), avoiding the direct initialization
of this mask.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index e35d97590311329fe1f7bd93be5cc4b845f3a7c2..453822cc4f9d3a9a9c7b62626c7362c13ee8b931 100644 (file)
--- a/drivers/dma/dw/platform.c
+++ b/drivers/dma/dw/platform.c
@@ -191,11 +191,9 @@ static int dw_probe(struct platform_device *pdev)
        if (IS_ERR(chip->regs))
                return PTR_ERR(chip->regs);
 
-       /* Apply default dma_mask if needed */
-       if (!dev->dma_mask) {
-               dev->dma_mask = &dev->coherent_dma_mask;
-               dev->coherent_dma_mask = DMA_BIT_MASK(32);
-       }
+       err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+       if (err)
+               return err;
 
        pdata = dev_get_platdata(dev);
        if (!pdata)