[PATCH 34/37] drm/ttm: fix fence locking in ttm_buffer_object_transfer

[Daniel Vetter]

Noticed while reviewing the fence locking in the radone pageflip
handler.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/ttm/ttm_bo_util.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c 
b/drivers/gpu/drm/ttm/ttm_bo_util.c
index b9c4e51..5c8b207 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -441,7 +441,9 @@ static int ttm_buffer_object_transfer(struct 
ttm_buffer_object *bo,
        fbo->vm_node = NULL;
        atomic_set(&fbo->cpu_writers, 0);

+       spin_lock(&bdev->fence_lock);
        fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
+       spin_unlock(&bdev->fence_lock);
        kref_init(&fbo->list_kref);
        kref_init(&fbo->kref);
        fbo->destroy = &ttm_transfered_destroy;
-- 
1.7.10.4