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dma-mapping: take dma_pfn_offset into account in dma_max_pfn 

This makes sure the generic version can be used with architectures /
devices that have a DMA offset in the direct mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2017-11-30 07:32:51 -08:00
parent 8fbc02ac62
commit a41ef1e455
1 changed files with 1 additions and 1 deletions
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2
include/linux/dma-mapping.h
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@ -692,7 +692,7 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
#ifndef dma_max_pfn
static inline unsigned long dma_max_pfn(struct device *dev)
{
return *dev->dma_mask >> PAGE_SHIFT;
return (*dev->dma_mask >> PAGE_SHIFT) + dev->dma_pfn_offset;
}
#endif