diff options
| -rw-r--r-- | arch/powerpc/platforms/pseries/iommu.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 44d47ac552a9..05c101e7dcd7 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -1026,9 +1026,12 @@ static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask) const void *dma_window = NULL; u64 dma_offset; - if (!dev->dma_mask || !dma_supported(dev, dma_mask)) + if (!dev->dma_mask) return -EIO; + if (!dev_is_pci(dev)) + goto check_mask; + pdev = to_pci_dev(dev); /* only attempt to use a new window if 64-bit DMA is requested */ @@ -1059,13 +1062,17 @@ static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask) } } - /* fall-through to iommu ops */ - if (!ddw_enabled) { - dev_info(dev, "Using 32-bit DMA via iommu\n"); + /* fall back on iommu ops, restore table pointer with ops */ + if (!ddw_enabled && get_dma_ops(dev) != &dma_iommu_ops) { + dev_info(dev, "Restoring 32-bit DMA via iommu\n"); set_dma_ops(dev, &dma_iommu_ops); pci_dma_dev_setup_pSeriesLP(pdev); } +check_mask: + if (!dma_supported(dev, dma_mask)) + return -EIO; + *dev->dma_mask = dma_mask; return 0; } |