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: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 402ab69..d42631c 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -817,11 +817,11 @@ retry:
                goto retry;
        }
 
-       ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
+       ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 
        if (unlikely(ret == -EBUSY)) {
                spin_unlock(&glob->lru_lock);
-               if (likely(!no_wait_gpu))
+               if (likely(!no_wait_reserve))
                        ret = ttm_bo_wait_unreserved(bo, interruptible);
 
                kref_put(&bo->list_kref, ttm_bo_release_list);