diff options
Diffstat (limited to 'arch/arm/mm/dma-mapping.c')
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 48836eba4ab7..330061d3d081 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1875,7 +1875,11 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p { struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev); dma_addr_t dma_addr; - int ret, prot, len = PAGE_ALIGN(size + offset); + int ret, prot, len, start_offset, map_offset; + + map_offset = offset & ~PAGE_MASK; + start_offset = offset & PAGE_MASK; + len = PAGE_ALIGN(map_offset + size); dma_addr = __alloc_iova(mapping, len); if (dma_addr == DMA_ERROR_CODE) @@ -1883,11 +1887,12 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p prot = __dma_direction_to_prot(dir); - ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, prot); + ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page) + + start_offset, len, prot); if (ret < 0) goto fail; - return dma_addr + offset; + return dma_addr + map_offset; fail: __free_iova(mapping, dma_addr, len); return DMA_ERROR_CODE; |