Sean Wang report dma_zalloc_coherent doesn't work as expect on his armv7,the allocated mem is not zeroed.The reason is __alloc_from_pool doesn't honor __GFP_ZERO.
Like commit 6829e274a623 ("arm64: dma-mapping: always clear allocated buffers") does,always clear allocated buffers to fix this. Reported-by: Sean Wang <sean.w...@mediatek.com> Signed-off-by: YueHaibing <yuehaib...@huawei.com> Reviewed-by: zhong jiang <zhongji...@huawei.com> --- arch/arm/mm/dma-mapping.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 6656647..cf5882f 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -564,6 +564,7 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page) *ret_page = phys_to_page(phys); ptr = (void *)val; + memset(ptr, 0, size); } return ptr; -- 2.7.0