[PATCH] drm/ttm: fix LRU handling in ttm_buffer_object_transfer

[Christian König]

We need to set the NO_EVICT flag on the ghost object or otherwise we are
adding it to the LRU.

When it is added to the LRU we can run into a race between destroying
and evicting it again.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo_util.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index ba80150d1052..895d77d799e4 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -492,8 +492,10 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 	if (!fbo)
 		return -ENOMEM;
 
-	ttm_bo_get(bo);
 	fbo->base = *bo;
+	fbo->base.mem.placement |= TTM_PL_FLAG_NO_EVICT;
+
+	ttm_bo_get(bo);
 	fbo->bo = bo;
 
 	/**
-- 
2.14.1