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[09/34] dma-mapping: take dma_pfn_offset into account in dma_max_pfn

Message ID 20180112084232.2857-10-hch@lst.de (mailing list archive)
State New, archived
Headers show

Commit Message

Christoph Hellwig Jan. 12, 2018, 8:42 a.m. UTC 
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>
---
 include/linux/dma-mapping.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 81ed9b2d84dc..d84951865be7 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -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