From cf9f123b38345b2c2777e642eb9bb561f4b7de91 Mon Sep 17 00:00:00 2001 From: Matthew Wilcox Date: Tue, 28 May 2013 16:46:46 -0400 Subject: [PATCH] NVMe: Use dma_set_mask() correctly 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 Signed-off-by: Matthew Wilcox --- drivers/block/nvme-core.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index 84937089d5db..a57d3bcec803 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -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; -- 2.39.5