hexagon: implement the sync_sg_for_device DMA operation

This methods needs to provide the equivalent of sync_single_for_device
for each S/G list element, but was missing.

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

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index d2b717f352f4..9e46556a227d 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c
@@ -188,6 +188,18 @@ static void hexagon_sync_single_for_device(struct device *dev,
         dma_sync(dma_addr_to_virt(dma_handle), size, dir);
 }
 
+static void hexagon_sync_sg_for_device(struct device *dev,
+                struct scatterlist *sgl, int nents, enum dma_data_direction dir)
+{
+        struct scatterlist *sg;
+        int i;
+
+        for_each_sg(sgl, sg, nents, i)
+                hexagon_sync_single_for_device(dev, sg_dma_address(sg),
+                                sg->length, dir);
+}
+
+
 static int hexagon_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
         return dma_addr == HEXAGON_MAPPING_ERROR;
@@ -199,6 +211,7 @@ const struct dma_map_ops hexagon_dma_ops = {
         .map_sg         = hexagon_map_sg,
         .map_page       = hexagon_map_page,
         .sync_single_for_device = hexagon_sync_single_for_device,
+        .sync_sg_for_device = hexagon_sync_sg_for_device,
         .mapping_error  = hexagon_mapping_error,
 };