hexagon: remove the sync_single_for_cpu DMA operation

hexagon does all the required cache maintainance at dma map time, and none
at unmap time.  It thus has to implement sync_single_for_device to match
the map cace for buffer reuse, but there is no point in doing another
invalidation in the sync_single_cpu_case, which in terms of cache
maintainance is equivalent to the unmap case.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index 77459df..d2b717f 100644 (file)
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c
@@ -181,13 +181,6 @@ static dma_addr_t hexagon_map_page(struct device *dev, struct page *page,
        return bus;
 }
 
-static void hexagon_sync_single_for_cpu(struct device *dev,
-                                       dma_addr_t dma_handle, size_t size,
-                                       enum dma_data_direction dir)
-{
-       dma_sync(dma_addr_to_virt(dma_handle), size, dir);
-}
-
 static void hexagon_sync_single_for_device(struct device *dev,
                                        dma_addr_t dma_handle, size_t size,
                                        enum dma_data_direction dir)
@@ -205,7 +198,6 @@ const struct dma_map_ops hexagon_dma_ops = {
        .free           = hexagon_free_coherent,
        .map_sg         = hexagon_map_sg,
        .map_page       = hexagon_map_page,
-       .sync_single_for_cpu = hexagon_sync_single_for_cpu,
        .sync_single_for_device = hexagon_sync_single_for_device,
        .mapping_error  = hexagon_mapping_error,
 };