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| author | Nicolin Chen <nicoleotsuka@gmail.com> | 2019-07-26 12:34:33 -0700 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-07-29 09:50:04 +0300 |
| commit | f46cc0152501e46d1b3aa5e7eade61145070eab0 (patch) | |
| tree | e8a0e7e34e2b9105ef60aa01ebd8eaf6faf9bfe3 /kernel/dma/contiguous.c | |
| parent | c6622a425acd1d2f3a443cd39b490a8777b622d7 (diff) | |
| download | lwn-f46cc0152501e46d1b3aa5e7eade61145070eab0.tar.gz lwn-f46cc0152501e46d1b3aa5e7eade61145070eab0.zip | |
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 <nicoleotsuka@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma/contiguous.c')
| -rw-r--r-- | kernel/dma/contiguous.c | 3 |
1 files changed, 2 insertions, 1 deletions
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)); } |