diff --git a/mm/hmm.c b/mm/hmm.c
index f6c4ddff4bd6..5955f2f0c83d 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -778,7 +778,7 @@ dma_addr_t hmm_dma_map_pfn(struct device *dev, struct hmm_dma_map *map,
 	struct page *page = hmm_pfn_to_page(pfns[idx]);
 	phys_addr_t paddr = hmm_pfn_to_phys(pfns[idx]);
 	size_t offset = idx * map->dma_entry_size;
-	unsigned long attrs = 0;
+	unsigned long attrs = DMA_ATTR_REQUIRE_COHERENT;
 	dma_addr_t dma_addr;
 	int ret;
 
@@ -871,7 +871,7 @@ bool hmm_dma_unmap_pfn(struct device *dev, struct hmm_dma_map *map, size_t idx)
 	struct dma_iova_state *state = &map->state;
 	dma_addr_t *dma_addrs = map->dma_list;
 	unsigned long *pfns = map->pfn_list;
-	unsigned long attrs = 0;
+	unsigned long attrs = DMA_ATTR_REQUIRE_COHERENT;
 
 	if ((pfns[idx] & valid_dma) != valid_dma)
 		return false;