[AVR32] Make dma_sync_*_for_cpu no-ops

I don't think the dma_sync_*_for_cpu ever did anything useful. We
flush the relevant cache lines when mapping the buffer or when calling
dma_sync_*_for_device(), and the CPU isn't allowed to touch the buffer
after that.

In other words, if these functions actually have anything to flush
from the caches, we're already in trouble.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

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