From: "Suzuki K. Poulose" <suzuki.poulose@xxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 7132813c384515c9dede1ae20e56f3895feb7f1e ]
Current implementation doesn't zero out the pages allocated.
Honor the __GFP_ZERO flag and zero out if set.
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>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
arch/arm64/mm/dma-mapping.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index d920942..df34a70 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -51,7 +51,7 @@ static int __init early_coherent_pool(char *p)
}
early_param("coherent_pool", early_coherent_pool);
-static void *__alloc_from_pool(size_t size, struct page **ret_page)
+static void *__alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags)
{
unsigned long val;
void *ptr = NULL;
@@ -67,6 +67,8 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page)
*ret_page = phys_to_page(phys);
ptr = (void *)val;
+ if (flags & __GFP_ZERO)
+ memset(ptr, 0, size);
}
return ptr;
@@ -101,6 +103,7 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size,
flags |= GFP_DMA;
if (IS_ENABLED(CONFIG_DMA_CMA) && (flags & __GFP_WAIT)) {
struct page *page;
+ void *addr;
size = PAGE_ALIGN(size);
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
@@ -109,7 +112,10 @@ static void *__dma_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);
}
@@ -145,7 +151,7 @@ static void *__dma_alloc_noncoherent(struct device *dev, size_t size,
if (!(flags & __GFP_WAIT)) {
struct page *page = NULL;
- void *addr = __alloc_from_pool(size, &page);
+ void *addr = __alloc_from_pool(size, &page, flags);
if (addr)
*dma_handle = phys_to_dma(dev, page_to_phys(page));
--
2.1.0
--
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