netdev - [net-next v2 10/17] fm10k: use dma_set_mask_and_coherent in fm10k

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Message-Id: <1434545704-112470-11-git-send-email-jeffrey.t.kirsher@intel.com>
Date:	Wed, 17 Jun 2015 05:54:57 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
	nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
	sergei.shtylyov@...entembedded.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next v2 10/17] fm10k: use dma_set_mask_and_coherent in fm10k_probe

From: Jacob Keller <jacob.e.keller@...el.com>

This patch cleans up the use of dma_get_required_mask and uses the
simpler dma_set_mask_and_coherent function instead of doing these as
separate steps.

I removed the dma_get_required_mask call because based on some minimal
testing it appears that either (a) we're not doing the right thing with
the call or (b) we don't need it anyways. If the value returned is
<48bits, we'll end up trying with 48 bits anyways. If it's over 48bits,
fm10k can't support that anyways, and we should try 48bits. If 48bits
fails, we'll fallback to 32bits. This cleans up some very funky code.

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
v2: updated error message to use %d

 drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
index fe54c78..ce53ff2 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -1741,30 +1741,18 @@ static int fm10k_probe(struct pci_dev *pdev,
 	struct fm10k_intfc *interface;
 	struct fm10k_hw *hw;
 	int err;
-	u64 dma_mask;
 
 	err = pci_enable_device_mem(pdev);
 	if (err)
 		return err;
 
-	/* By default fm10k only supports a 48 bit DMA mask */
-	dma_mask = DMA_BIT_MASK(48) | dma_get_required_mask(&pdev->dev);
-
-	if ((dma_mask <= DMA_BIT_MASK(32)) ||
-	    dma_set_mask_and_coherent(&pdev->dev, dma_mask)) {
-		dma_mask &= DMA_BIT_MASK(32);
-
+	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48));
+	if (err)
 		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
-		if (err) {
-			err = dma_set_coherent_mask(&pdev->dev,
-						    DMA_BIT_MASK(32));
-			if (err) {
-				dev_err(&pdev->dev,
-					"No usable DMA configuration, aborting\n");
-				goto err_dma;
-			}
-		}
+	if (err) {
+		dev_err(&pdev->dev,
+			"DMA configuration failed: %d\n", err);
+		goto err_dma;
 	}
 
 	err = pci_request_selected_regions(pdev,
-- 
2.4.3

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