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dma-mapping fix for 5.4

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- fix a regression in the intel-iommu get_required_mask conversion
    (Arvind Sankar)
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Merge tag 'dma-mapping-5.4-2' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fix from Christoph Hellwig:
 "Fix a regression in the intel-iommu get_required_mask conversion
  (Arvind Sankar)"

* tag 'dma-mapping-5.4-2' of git://git.infradead.org/users/hch/dma-mapping:
  iommu/vt-d: Return the correct dma mask when we are bypassing the IOMMU
This commit is contained in:
Linus Torvalds 2019-10-26 06:29:04 -04:00
commit 964f9cfaae
1 changed files with 9 additions and 1 deletions
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10
drivers/iommu/intel-iommu.c
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@ -3471,7 +3471,7 @@ static bool iommu_need_mapping(struct device *dev)
if (dev->coherent_dma_mask && dev->coherent_dma_mask < dma_mask)
dma_mask = dev->coherent_dma_mask;
if (dma_mask >= dma_get_required_mask(dev))
if (dma_mask >= dma_direct_get_required_mask(dev))
return false;
/*
@ -3775,6 +3775,13 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
return nelems;
}
static u64 intel_get_required_mask(struct device *dev)
{
if (!iommu_need_mapping(dev))
return dma_direct_get_required_mask(dev);
return DMA_BIT_MASK(32);
}
static const struct dma_map_ops intel_dma_ops = {
.alloc = intel_alloc_coherent,
.free = intel_free_coherent,
@ -3787,6 +3794,7 @@ static const struct dma_map_ops intel_dma_ops = {
.dma_supported = dma_direct_supported,
.mmap = dma_common_mmap,
.get_sgtable = dma_common_get_sgtable,
.get_required_mask = intel_get_required_mask,
};
static void