diff options
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 437613588df1..b900eb1d5e17 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -1852,6 +1852,14 @@ static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask) /* 4GB offset bypasses 32-bit space */ set_dma_offset(&pdev->dev, (1ULL << 32)); set_dma_ops(&pdev->dev, &dma_direct_ops); + } else if (dma_mask >> 32 && dma_mask != DMA_BIT_MASK(64)) { + /* + * Fail the request if a DMA mask between 32 and 64 bits + * was requested but couldn't be fulfilled. Ideally we + * would do this for 64-bits but historically we have + * always fallen back to 32-bits. + */ + return -ENOMEM; } else { dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n"); set_dma_ops(&pdev->dev, &dma_iommu_ops); |