[PATCH 1/3] dmaengine: ptdma: Remove obsolete 32-bit DMA mask fallback

[Ruizhe Zhou <zhouruizhe@resnics.com>]

The DMA API guarantees support for masks of 32 bits or wider and
explicitly identifies retrying a 32-bit mask after a wider request as
incorrect:
https://docs.kernel.org/core-api/dma-api-howto.html#dma-addressing-capabilities

Remove the obsolete fallback while retaining the error check so that a
genuine DMA setup failure is still reported and aborts initialization.

Signed-off-by: Ruizhe Zhou <zhouruizhe@resnics.com>
---
 drivers/dma/amd/ptdma/ptdma-pci.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/amd/ptdma/ptdma-pci.c b/drivers/dma/amd/ptdma/ptdma-pci.c
index 22739ff0c3c5..d36bb9c67325 100644
--- a/drivers/dma/amd/ptdma/ptdma-pci.c
+++ b/drivers/dma/amd/ptdma/ptdma-pci.c
@@ -178,12 +178,8 @@ static int pt_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
 	if (ret) {
-		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
-		if (ret) {
-			dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
-				ret);
-			goto e_err;
-		}
+		dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret);
+		goto e_err;
 	}
 
 	dev_set_drvdata(dev, pt);
-- 
2.27.0