[PATCH] drm/ttm: fix adding foreign BOs to the LRU during init

[Christian König]

From: Christian König <christian.koe...@amd.com>

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

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 745e996..a98a5d5 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);

-- 
2.5.0