---
  arch/arm/mm/dma-mapping.c |   43 ++++++++++++++++++++++++++++---------------
  1 file changed, 28 insertions(+), 15 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index f5e1a84..1272ed2 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c

@@ -1232,7 +1232,8 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size)
  				break;
  
  		len = (j - i) << PAGE_SHIFT;
-		ret = iommu_map(mapping->domain, iova, phys, len, 0);
+		ret = iommu_map(mapping->domain, iova, phys, len,
+				IOMMU_READ|IOMMU_WRITE);
  		if (ret < 0)
  			goto fail;
  		iova += len;

@@ -1431,6 +1432,27 @@ static int arm_iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
  					 GFP_KERNEL);
  }
  
+static int __dma_direction_to_prot(enum dma_data_direction dir)
+{
+	int prot;
+
+	switch (dir) {
+	case DMA_BIDIRECTIONAL:
+		prot = IOMMU_READ | IOMMU_WRITE;
+		break;
+	case DMA_TO_DEVICE:
+		prot = IOMMU_READ;
+		break;
+	case DMA_FROM_DEVICE:
+		prot = IOMMU_WRITE;
+		break;
+	default:
+		prot = 0;
+	}
+
+	return prot;
+}
+
  /*
   * Map a part of the scatter-gather list into contiguous io address space
   */

@@ -1444,6 +1466,7 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
  	int ret = 0;
  	unsigned int count;
  	struct scatterlist *s;
+	int prot;
  
  	size = PAGE_ALIGN(size);
  	*handle = DMA_ERROR_CODE;

@@ -1460,7 +1483,9 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
  			!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
  			__dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
  
-		ret = iommu_map(mapping->domain, iova, phys, len, 0);
+		prot = __dma_direction_to_prot(dir);
+
+		ret = iommu_map(mapping->domain, iova, phys, len, prot);
  		if (ret < 0)
  			goto fail;
  		count += len >> PAGE_SHIFT;

@@ -1665,19 +1690,7 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p
  	if (dma_addr == DMA_ERROR_CODE)
  		return dma_addr;
  
-	switch (dir) {
-	case DMA_BIDIRECTIONAL:
-		prot = IOMMU_READ | IOMMU_WRITE;
-		break;
-	case DMA_TO_DEVICE:
-		prot = IOMMU_READ;
-		break;
-	case DMA_FROM_DEVICE:
-		prot = IOMMU_WRITE;
-		break;
-	default:
-		prot = 0;
-	}
+	prot = __dma_direction_to_prot(dir);
  
  	ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, prot);
  	if (ret < 0)