sata_mv: use dma_set_mask_and_coherent

Use the dma_set_mask_and_coherent helper to set the DMA mask.  Rely
on the relatively recent change that setting a larger than required
mask will never fail to avoid the need for the boilerplate 32-bit
fallback code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/ata/sata_mv.c

@@ -4314,38 +4314,6 @@ static struct pci_driver mv_pci_driver = {
 
 };
 
-/* move to PCI layer or libata core? */
-static int pci_go_64(struct pci_dev *pdev)
-{
-	int rc;
-
-	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
-		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
-		if (rc) {
-			rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
-			if (rc) {
-				dev_err(&pdev->dev,
-					"64-bit DMA enable failed\n");
-				return rc;
-			}
-		}
-	} else {
-		rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
-		if (rc) {
-			dev_err(&pdev->dev, "32-bit DMA enable failed\n");
-			return rc;
-		}
-		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
-		if (rc) {
-			dev_err(&pdev->dev,
-				"32-bit consistent DMA enable failed\n");
-			return rc;
-		}
-	}
-
-	return rc;
-}
-
 /**
  *      mv_print_info - Dump key info to kernel log for perusal.
  *      @host: ATA host to print info about
@@ -4430,9 +4398,11 @@ static int mv_pci_init_one(struct pci_dev *pdev,
 	host->iomap = pcim_iomap_table(pdev);
 	hpriv->base = host->iomap[MV_PRIMARY_BAR];
 
-	rc = pci_go_64(pdev);
-	if (rc)
+	rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (rc) {
+		dev_err(&pdev->dev, "DMA enable failed\n");
 		return rc;
+	}
 
 	rc = mv_create_dma_pools(hpriv, &pdev->dev);
 	if (rc)