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Merge tag 'dma-mapping-4.19-2' of git://git.infradead.org/users/hch/dma-mapping

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Pull dma-mapping fixes from Christoph Hellwig:
 "A few fixes for the fallout of being a little more pedantic about dma
  masks"

* tag 'dma-mapping-4.19-2' of git://git.infradead.org/users/hch/dma-mapping:
  of/platform: initialise AMBA default DMA masks
  sparc: set a default 32-bit dma mask for OF devices
  kernel/dma/direct: take DMA offset into account in dma_direct_supported
This commit is contained in:
Linus Torvalds
2018-09-02 20:09:36 -07:00
parent 57361846b5 8c89ef7b6b
commit 60c1f89241
4 changed files with 13 additions and 2 deletions
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4
kernel/dma/direct.c
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@@ -168,7 +168,7 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
int dma_direct_supported(struct device *dev, u64 mask)
{
#ifdef CONFIG_ZONE_DMA
if (mask < DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
if (mask < phys_to_dma(dev, DMA_BIT_MASK(ARCH_ZONE_DMA_BITS)))
return 0;
#else
/*
@@ -177,7 +177,7 @@ int dma_direct_supported(struct device *dev, u64 mask)
* memory, or by providing a ZONE_DMA32. If neither is the case, the
* architecture needs to use an IOMMU instead of the direct mapping.
*/
if (mask < DMA_BIT_MASK(32))
if (mask < phys_to_dma(dev, DMA_BIT_MASK(32)))
return 0;
#endif
/*