From: "Suzuki K. Poulose" <suzuki.poulose@xxxxxxx>
Current implementation doesn't zero out the pages allocated.
Honor the __GFP_ZERO flag and zero out if set.
This is backport of upstream commit : 7132813c384515c9ded
Cc: <stable@xxxxxxxxxxxxxxx> # v3.14
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
---
arch/arm64/mm/dma-mapping.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index fbd7678..3974881 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -44,6 +44,7 @@ static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size,
flags |= GFP_DMA32;
if (IS_ENABLED(CONFIG_DMA_CMA)) {
struct page *page;
+ void *addr;
size = PAGE_ALIGN(size);
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
@@ -52,7 +53,10 @@ static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size,
return NULL;
*dma_handle = phys_to_dma(dev, page_to_phys(page));
- return page_address(page);
+ addr = page_address(page);
+ if (flags & __GFP_ZERO)
+ memset(addr, 0, size);
+ return addr;
} else {
return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
}
--
1.7.9.5
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