netdev - Re: [PATCH 18/51] DMA-API: staging: et131x: replace dma_set_mask()+dma_set_coherent

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Message-ID: <20130921195531.GO12758@n2100.arm.linux.org.uk>
Date:	Sat, 21 Sep 2013 20:55:31 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	devel@...verdev.osuosl.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 18/51] DMA-API: staging: et131x: replace
	dma_set_mask()+dma_set_coherent_mask() with new helper

On Fri, Sep 20, 2013 at 04:42:08PM +0100, Ben Hutchings wrote:
> On Thu, 2013-09-19 at 22:43 +0100, Russell King wrote:
> > +	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)) ||
> > +	    dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
> 
> Surely we want && here.

Good catch, exactly right.  Thanks for the review, here's the replacement
patch:

8<====
From: Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH] DMA-API: staging: et131x: replace
 dma_set_mask()+dma_set_coherent_mask() with new helper

Replace the following sequence:

	dma_set_mask(dev, mask);
	dma_set_coherent_mask(dev, mask);

with a call to the new helper dma_set_mask_and_coherent().

Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
---
 drivers/staging/et131x/et131x.c |   17 ++---------------
 1 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index f73e58f..61da7ee 100644
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -4797,21 +4797,8 @@ static int et131x_pci_setup(struct pci_dev *pdev,
 	pci_set_master(pdev);
 
 	/* Check the DMA addressing support of this device */
-	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
-		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
-		if (rc < 0) {
-			dev_err(&pdev->dev,
-			  "Unable to obtain 64 bit DMA for consistent allocations\n");
-			goto err_release_res;
-		}
-	} else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
-		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
-		if (rc < 0) {
-			dev_err(&pdev->dev,
-			  "Unable to obtain 32 bit DMA for consistent allocations\n");
-			goto err_release_res;
-		}
-	} else {
+	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)) &&
+	    dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
 		dev_err(&pdev->dev, "No usable DMA addressing method\n");
 		rc = -EIO;
 		goto err_release_res;
-- 
1.7.4.4


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