drm/panthor: Flush shmem writes before mapping buffers CPU-uncached #422
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The shmem layer zeroes out the new pages using cached mappings, and if we don't CPU-flush we might leave dirty cachelines behind, leading to potential data leaks and/or asynchronous buffer corruption when dirty cachelines are evicted. Fixes: 8a1cc07 ("drm/panthor: Add GEM logical block") Signed-off-by: Boris Brezillon <[email protected]>
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The patch applied cleanly but needs to be tested to make sure it didn't break anything downstream. |
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From upstream: https://lore.kernel.org/dri-devel/[email protected]/T/#u
The shmem layer zeroes out the new pages using cached mappings, and if we don't CPU-flush we might leave dirty cachelines behind, leading to potential data leaks and/or asynchronous buffer corruption when dirty cachelines are evicted.
Fixes: 8a1cc07 ("drm/panthor: Add GEM logical block")