[PATCH 20/31] avr32: handle page-less SG entries

Christoph Hellwig
2015-08-12T07:05:39Z

Make all cache invalidation conditional on sg_has_page() and use
sg_phys to get the physical address directly, bypassing the noop
page_to_bus.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/avr32/include/asm/dma-mapping.h | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/avr32/include/asm/dma-mapping.h b/arch/avr32/include/asm/dma-mapping.h
index ae7ac92..a662ce2 100644
--- a/arch/avr32/include/asm/dma-mapping.h
+++ b/arch/avr32/include/asm/dma-mapping.h
@@ -216,11 +216,9 @@ dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
struct scatterlist *sg;

for_each_sg(sglist, sg, nents, i) {
- char *virt;
-
- sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
- virt = sg_virt(sg);
- dma_cache_sync(dev, virt, sg->length, direction);
+ sg->dma_address = sg_phys(sg);
+ if (sg_has_page(sg))
+ dma_cache_sync(dev, sg_virt(sg), sg->length, direction);
}

return nents;
@@ -328,8 +326,10 @@ dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
int i;
struct scatterlist *sg;

- for_each_sg(sglist, sg, nents, i)
- dma_cache_sync(dev, sg_virt(sg), sg->length, direction);
+ for_each_sg(sglist, sg, nents, i) {
+ if (sg_has_page(sg))
+ dma_cache_sync(dev, sg_virt(sg), sg->length, direction);
+ }
}

/* Now for the API extensions over the pci_ one */
--
1.9.1