drm/ttm: fix adding foreign BOs to the LRU during init v2

If we import a BO with an external reservation object we don't
reserve/unreserve it. So we never add it to the LRU causing a possible
denial of service.

v2: fix typo in commit message

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 745e996d2dbc..a98a5d5d756d 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1170,9 +1170,15 @@ int ttm_bo_init(struct ttm_bo_device *bdev,
         if (likely(!ret))
                 ret = ttm_bo_validate(bo, placement, interruptible, false);
 
-        if (!resv)
+        if (!resv) {
                 ttm_bo_unreserve(bo);
 
+        } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
+                spin_lock(&bo->glob->lru_lock);
+                ttm_bo_add_to_lru(bo);
+                spin_unlock(&bo->glob->lru_lock);
+        }
+
         if (unlikely(ret))
                 ttm_bo_unref(&bo);