[24/33] powerpc/dma: fix an off-by-one in dma_capable

Message ID 20181009132500.17643-25-hch@lst.de
State New
Headers show
Series
  • [01/33] powerpc: use mm zones more sensibly
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Context Check Description
snowpatch_ozlabs/apply_patch fail Failed to apply to any branch

Commit Message

Christoph Hellwig Oct. 9, 2018, 1:24 p.m.
We need to compare the last byte in the dma range and not the one after it
for the bus_dma_mask, just like we do for the regular dma_mask.  Fix this
cleanly by merging the two comparisms into one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/powerpc/include/asm/dma-direct.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Patch

diff --git a/arch/powerpc/include/asm/dma-direct.h b/arch/powerpc/include/asm/dma-direct.h
index e00ab5d0612d..92d8aed86422 100644
--- a/arch/powerpc/include/asm/dma-direct.h
+++ b/arch/powerpc/include/asm/dma-direct.h
@@ -4,15 +4,11 @@ 
 
 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 {
-#ifdef CONFIG_SWIOTLB
-	if (dev->bus_dma_mask && addr + size > dev->bus_dma_mask)
-		return false;
-#endif
-
 	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);
 }
 
 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)