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Diffstat (limited to 'include/asm-avr32/dma-mapping.h')
-rw-r--r--include/asm-avr32/dma-mapping.h17
1 files changed, 10 insertions, 7 deletions
diff --git a/include/asm-avr32/dma-mapping.h b/include/asm-avr32/dma-mapping.h
index 21bb60bbb9a..81e342636ac 100644
--- a/include/asm-avr32/dma-mapping.h
+++ b/include/asm-avr32/dma-mapping.h
@@ -264,7 +264,11 @@ static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
{
- dma_cache_sync(dev, bus_to_virt(dma_handle), size, direction);
+ /*
+ * No need to do anything since the CPU isn't supposed to
+ * touch this memory after we flushed it at mapping- or
+ * sync-for-device time.
+ */
}
static inline void
@@ -309,12 +313,11 @@ static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction direction)
{
- int i;
-
- for (i = 0; i < nents; i++) {
- dma_cache_sync(dev, page_address(sg[i].page) + sg[i].offset,
- sg[i].length, direction);
- }
+ /*
+ * No need to do anything since the CPU isn't supposed to
+ * touch this memory after we flushed it at mapping- or
+ * sync-for-device time.
+ */
}
static inline void