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| author |   Robin Murphy <robin.murphy@arm.com> | 2018-12-10 19:33:31 +0000 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2018-12-11 11:55:32 +0000 |
| commit | 3238c359acee4ab57f15abb5a82b8ab38a661ee7 (patch) | |
| tree | 2e5882f781c7a89a870222b2fd5221eedff3f7f4 /arch | |
| parent | Linux 4.20-rc6 (diff) | |
| download | linux-dev-3238c359acee4ab57f15abb5a82b8ab38a661ee7.tar.xz linux-dev-3238c359acee4ab57f15abb5a82b8ab38a661ee7.zip | |
arm64: dma-mapping: Fix FORCE_CONTIGUOUS buffer clearing
We need to invalidate the caches *before* clearing the buffer via the
non-cacheable alias, else in the worst case __dma_flush_area() may
write back dirty lines over the top of our nice new zeros.
Fixes: dd65a941f6ba ("arm64: dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag")
Cc: <stable@vger.kernel.org> # 4.18.x-
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index a3ac26284845..a53704406099 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -429,9 +429,9 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, prot, __builtin_return_address(0)); if (addr) { - memset(addr, 0, size); if (!coherent) __dma_flush_area(page_to_virt(page), iosize); + memset(addr, 0, size); } else { iommu_dma_unmap_page(dev, *handle, iosize, 0, attrs); dma_release_from_contiguous(dev, page, |