[PATCH 28/31] powerpc: handle page-less SG entries

[Christoph Hellwig]

Make all cache invalidation conditional on sg_has_page().

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 arch/powerpc/kernel/dma.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 35e4dcc..cece40b 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -135,7 +135,10 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 	for_each_sg(sgl, sg, nents, i) {
 		sg->dma_address = sg_phys(sg) + get_dma_offset(dev);
 		sg->dma_length = sg->length;
-		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+		if (sg_has_page(sg)) {
+			__dma_sync_page(sg_page(sg), sg->offset, sg->length,
+					direction);
+		}
 	}
 
 	return nents;
@@ -200,7 +203,10 @@ static inline void dma_direct_sync_sg(struct device *dev,
 	int i;
 
 	for_each_sg(sgl, sg, nents, i)
-		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+		if (sg_has_page(sg)) {
+			__dma_sync_page(sg_page(sg), sg->offset, sg->length,
+					direction);
+		}
 }
 
 static inline void dma_direct_sync_single(struct device *dev,
-- 
1.9.1