1 files changed, 10 insertions, 2 deletions

diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c
index 09bb774b39cd..24e0f8c21f2f 100644
--- a/arch/tile/kernel/pci-dma.c
+++ b/arch/tile/kernel/pci-dma.c
@@ -213,10 +213,12 @@ static int tile_dma_map_sg(struct device *dev, struct scatterlist *sglist,
 
         for_each_sg(sglist, sg, nents, i) {
                 sg->dma_address = sg_phys(sg);
-                __dma_prep_pa_range(sg->dma_address, sg->length, direction);
 #ifdef CONFIG_NEED_SG_DMA_LENGTH
                 sg->dma_length = sg->length;
 #endif
+                if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+                        continue;
+                __dma_prep_pa_range(sg->dma_address, sg->length, direction);
         }
 
         return nents;
@@ -232,6 +234,8 @@ static void tile_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
         BUG_ON(!valid_dma_direction(direction));
         for_each_sg(sglist, sg, nents, i) {
                 sg->dma_address = sg_phys(sg);
+                if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+                        continue;
                 __dma_complete_pa_range(sg->dma_address, sg->length,
                                         direction);
         }
@@ -245,7 +249,8 @@ static dma_addr_t tile_dma_map_page(struct device *dev, struct page *page,
         BUG_ON(!valid_dma_direction(direction));
 
         BUG_ON(offset + size > PAGE_SIZE);
-        __dma_prep_page(page, offset, size, direction);
+        if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+                __dma_prep_page(page, offset, size, direction);
 
         return page_to_pa(page) + offset;
 }
@@ -256,6 +261,9 @@ static void tile_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 {
         BUG_ON(!valid_dma_direction(direction));
 
+        if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+                return;
+
         __dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
                             dma_address & (PAGE_SIZE - 1), size, direction);
 }