[PATCH net-next 12/14] net: pch_gbe: Remove obsolete 32-bit DMA mask fallback

[Ruizhe Zhou]

The DMA API guarantees support for masks of 32 bits or wider and
explicitly identifies retrying a 32-bit mask after a 64-bit 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@xxxxxxxxxxx>
---
 drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 88c5c52e0e38..ba3d10f9aec6 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -2504,12 +2504,10 @@ static int pch_gbe_probe(struct pci_dev *pdev,
 	if (ret)
 		return ret;
 
-	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
-		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (ret) {
-			dev_err(&pdev->dev, "ERR: No usable DMA configuration, aborting\n");
-			return ret;
-		}
+	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(&pdev->dev, "ERR: No usable DMA configuration, aborting\n");
+		return ret;
 	}
 
 	ret = pcim_iomap_regions(pdev, 1 << PCH_GBE_PCI_BAR, pci_name(pdev));
-- 
2.27.0