From: Nicolin Chen Date: Fri, 26 Jul 2019 19:34:33 +0000 (-0700) Subject: dma-contiguous: page-align the size in dma_free_contiguous() X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=f46cc0152501e46d1b3aa5e7eade61145070eab0;p=android-x86%2Fkernel.git dma-contiguous: page-align the size in dma_free_contiguous() According to the original dma_direct_alloc_pages() code: { unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; if (!dma_release_from_contiguous(dev, page, count)) __free_pages(page, get_order(size)); } The count parameter for dma_release_from_contiguous() was page aligned before the right-shifting operation, while the new API dma_free_contiguous() forgets to have PAGE_ALIGN() at the size. So this patch simply adds it to prevent any corner case. Fixes: fdaeec198ada ("dma-contiguous: add dma_{alloc,free}_contiguous() helpers") Signed-off-by: Nicolin Chen Reviewed-by: Christoph Hellwig Signed-off-by: Christoph Hellwig --- diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index ea8259f53eda..2bd410f934b3 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -267,7 +267,8 @@ struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp) */ void dma_free_contiguous(struct device *dev, struct page *page, size_t size) { - if (!cma_release(dev_get_cma_area(dev), page, size >> PAGE_SHIFT)) + if (!cma_release(dev_get_cma_area(dev), page, + PAGE_ALIGN(size) >> PAGE_SHIFT)) __free_pages(page, get_order(size)); }