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dma-direct: implement complete bus_dma_mask handling

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Instead of rejecting devices with a too small bus_dma_mask we can handle
by taking the bus dma_mask into account for allocations and bounce
buffering decisions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig
2018-09-20 14:04:08 +02:00
parent 7d21ee4c71
commit b4ebe60632
2 changed files with 13 additions and 11 deletions
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3
include/linux/dma-direct.h
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@@ -27,7 +27,8 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
if (!dev->dma_mask)
return false;
return addr + size - 1 <= *dev->dma_mask;
return addr + size - 1 <=
min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
}
#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */