arm64: Align CMA sizes to PAGE_SIZE

dma_alloc_from_contiguous takes number of pages for a size.
Align up the dma size passed in to page size to avoid truncation
and allocation failures on sizes less than PAGE_SIZE.

Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit ccc9e244eb1b9654915634827322932cbafd8244)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 7821d016bb46dd46887ba2098773bd791e9da5e0..550873ace5977eff3092ee53f2f0b160174b2fb7 100644 (file)
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -40,6 +40,7 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size,
        if (IS_ENABLED(CONFIG_DMA_CMA)) {
                struct page *page;
 
+               size = PAGE_ALIGN(size);
                page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
                                                        get_order(size));
                if (!page)