Since xtensa doesn't select ARCH_HAS_SG_CHAIN, it is not necessary to
use for_each_sg() in order to loop over each sg element. But this can
help find problems with drivers that do not properly initialize their
sg tables when CONFIG_DEBUG_SG is enabled.
Signed-off-by: Akinobu Mita <akinobu.m...@gmail.com>
Cc: Chris Zankel <ch...@zankel.net>
Cc: Max Filippov <jcmvb...@gmail.com>
Cc: linux-xte...@linux-xtensa.org
Cc: linux-a...@vger.kernel.org
---
arch/xtensa/include/asm/dma-mapping.h | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/xtensa/include/asm/dma-mapping.h
b/arch/xtensa/include/asm/dma-mapping.h
index 172a02a..54d2b22 100644
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h
@@ -52,14 +52,15 @@ dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
size_t size,
}
static inline int
-dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction direction)
{
int i;
+ struct scatterlist *sg;
BUG_ON(direction == DMA_NONE);
- for (i = 0; i < nents; i++, sg++ ) {
+ for_each_sg(sglist, sg, nents, i) {
BUG_ON(!sg_page(sg));
sg->dma_address = sg_phys(sg);
@@ -124,20 +125,24 @@ dma_sync_single_range_for_device(struct device *dev,
dma_addr_t dma_handle,
consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
}
static inline void
-dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nelems,
enum dma_data_direction dir)
{
int i;
- for (i = 0; i < nelems; i++, sg++)
+ struct scatterlist *sg;
+
+ for_each_sg(sglist, sg, nelems, i)
consistent_sync(sg_virt(sg), sg->length, dir);
}
static inline void
-dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
- enum dma_data_direction dir)
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
+ int nelems, enum dma_data_direction dir)
{
int i;
- for (i = 0; i < nelems; i++, sg++)
+ struct scatterlist *sg;
+
+ for_each_sg(sglist, sg, nelems, i)
consistent_sync(sg_virt(sg), sg->length, dir);
}
static inline int
--
1.9.1
--
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