[ 51/82] drm/ttm: Fix spinlock imbalance

[Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>]

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>

commit a8ff3ee211fccf708e1911bbc096625453ebf759 upstream.

This imbalance may cause hangs when TTM is trying to swap out a buffer
that is already on the delayed delete list.

Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Jakob Bornecrantz <jakob@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/ttm/ttm_bo.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1821,6 +1821,7 @@ static int ttm_bo_swapout(struct ttm_mem
 			spin_unlock(&glob->lru_lock);
 			(void) ttm_bo_cleanup_refs(bo, false, false, false);
 			kref_put(&bo->list_kref, ttm_bo_release_list);
+			spin_lock(&glob->lru_lock);
 			continue;
 		}
 


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