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NVMe: Use dma_set_mask() correctly

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In some circumstances setting a 64-bit DMA mask can fail, as explained
in Documentation/DMA-API-HOWTO.txt.  Use the recommended code sequence
to set a 32-bit DMA mask if setting a 64-bit DMA mask fails.

Reported-by: Chayan Biswas <Chayan.Biswas@sandisk.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Matthew Wilcox 2013-05-28 16:46:46 -04:00
parent cf90bc4830
commit cf9f123b38
1 changed files with 8 additions and 2 deletions
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10
drivers/block/nvme-core.c
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@ -1927,8 +1927,14 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
INIT_LIST_HEAD(&dev->namespaces);
dev->pci_dev = pdev;
pci_set_drvdata(pdev, dev);
dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)))
dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
else
goto disable;
result = nvme_set_instance(dev);
if (result)
goto disable;