drm/ttm: Fix a theoretical race
The ttm_mem_evict_first function could theoretically drop the lru lock without retrying if a reservation from off the LRU list ended up waiting. However, since currently there are no users that could cause a wait in that situation so this is not suitable for stable Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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