netdev - [PATCH 3/4] net: sgi: ioc3-eth: simplify setting the DMA mask

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Date:   Wed, 30 Oct 2019 14:12:32 -0700
From:   Christoph Hellwig <hch@....de>
To:     "David S. Miller" <davem@...emloft.net>,
        Thomas Bogendoerfer <tbogendoerfer@...e.de>
Cc:     linux-mips@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] net: sgi: ioc3-eth: simplify setting the DMA mask

There is no need to fall back to a lower mask these days, the DMA mask
just communictes the hardware supported features.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/net/ethernet/sgi/ioc3-eth.c | 27 +++++++--------------------
 1 file changed, 7 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index 8a684d882e63..dc2e22652b55 100644
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -1173,26 +1173,14 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	struct ioc3 *ioc3;
 	unsigned long ioc3_base, ioc3_size;
 	u32 vendor, model, rev;
-	int err, pci_using_dac;
+	int err;
 
 	/* Configure DMA attributes. */
-	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
-	if (!err) {
-		pci_using_dac = 1;
-		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
-		if (err < 0) {
-			pr_err("%s: Unable to obtain 64 bit DMA for consistent allocations\n",
-			       pci_name(pdev));
-			goto out;
-		}
-	} else {
-		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
-		if (err) {
-			pr_err("%s: No usable DMA configuration, aborting.\n",
-			       pci_name(pdev));
-			goto out;
-		}
-		pci_using_dac = 0;
+	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (err) {
+		pr_err("%s: No usable DMA configuration, aborting.\n",
+		       pci_name(pdev));
+		goto out;
 	}
 
 	if (pci_enable_device(pdev))
@@ -1204,8 +1192,7 @@ static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto out_disable;
 	}
 
-	if (pci_using_dac)
-		dev->features |= NETIF_F_HIGHDMA;
+	dev->features |= NETIF_F_HIGHDMA;
 
 	err = pci_request_regions(pdev, "ioc3");
 	if (err)
-- 
2.20.1