rocker: Remove useless DMA-32 fallback configuration

As stated in [1], dma_set_mask() with a 64-bit mask never fails if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

Simplify code and remove some dead code accordingly.

[1]: https://lkml.org/lkml/2021/6/7/398

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/9ba2d13099d216f3df83e50ad33a05504c90fe7c.1641744274.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/rocker/rocker_main.c b/drivers/net/ethernet/rocker/rocker_main.c
index b620470..3fcea21 100644 (file)
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -2870,19 +2870,10 @@ static int rocker_probe(struct pci_dev *pdev, const struct pci_device_id *id)
                goto err_pci_request_regions;
        }
 
-       err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
-       if (!err) {
-               err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
-               if (err) {
-                       dev_err(&pdev->dev, "dma_set_coherent_mask failed\n");
-                       goto err_pci_set_dma_mask;
-               }
-       } else {
-               err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
-               if (err) {
-                       dev_err(&pdev->dev, "dma_set_mask failed\n");
-                       goto err_pci_set_dma_mask;
-               }
+       err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+       if (err) {
+               dev_err(&pdev->dev, "dma_set_mask failed\n");
+               goto err_pci_set_dma_mask;
        }
 
        if (pci_resource_len(pdev, 0) < ROCKER_PCI_BAR0_SIZE) {