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DMA-API: net: intel/igbvf: fix 32-bit DMA mask handling 

The fallback to 32-bit DMA mask is rather odd:
	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)
			pci_using_dac = 1;
	} else {
		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;
			}
		}
	}
This means we only set the coherent DMA mask in the fallback path if
the DMA mask set failed, which is silly.  This fixes it to set the
coherent DMA mask only if dma_set_mask() succeeded, and to error out
if either fails.

Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2013-06-10 12:26:32 +01:00
parent dc4ff9bb75
commit c21b8ebc2f
1 changed files with 6 additions and 12 deletions
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18
drivers/net/ethernet/intel/igbvf/netdev.c
View File

@ -2638,21 +2638,15 @@ static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
return err; return err;
pci_using_dac = 0; pci_using_dac = 0;
err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (!err) { if (!err) {
err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); pci_using_dac = 1;
if (!err)
pci_using_dac = 1;
} else { } else {
err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (err) { if (err) {
err = dma_set_coherent_mask(&pdev->dev, dev_err(&pdev->dev, "No usable DMA "
DMA_BIT_MASK(32)); "configuration, aborting\n");
if (err) { goto err_dma;
dev_err(&pdev->dev, "No usable DMA "
"configuration, aborting\n");
goto err_dma;
}
} }
} }