arm64: dma-mapping: Fix FORCE_CONTIGUOUS buffer clearing

[linux.git] / arch / arm64 / mm / dma-mapping.c

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 3a703e5d4e3237f9844d09e871ef1eaa62b781cc..a5370440609917c10fb2f2c4ffbc26f5e1a1ba9f 100644 (file)
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -160,6 +160,7 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
        __dma_unmap_area(phys_to_virt(paddr), size, dir);
 }
 
+#ifdef CONFIG_IOMMU_DMA
 static int __swiotlb_get_sgtable_page(struct sg_table *sgt,
                                      struct page *page, size_t size)
 {
@@ -188,6 +189,7 @@ static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
 
        return ret;
 }
+#endif /* CONFIG_IOMMU_DMA */
 
 static int __init atomic_pool_init(void)
 {
@@ -427,9 +429,9 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
                                                   prot,
                                                   __builtin_return_address(0));
                if (addr) {
-                       memset(addr, 0, size);
                        if (!coherent)
                                __dma_flush_area(page_to_virt(page), iosize);
+                       memset(addr, 0, size);
                } else {
                        iommu_dma_unmap_page(dev, *handle, iosize, 0, attrs);
                        dma_release_from_contiguous(dev, page,