[PATCH 09/25] drm/gem: Check locking in drm_gem_object_unreference

[Daniel Vetter]

Pretty soon only some drivers will need dev->struct_mutex in their
gem_free_object callbacks. Hence it's really important to make sure
everything still keeps getting this right.

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 include/drm/drm_gem.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 7a592d7e398b..5b3754864fb0 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -142,6 +142,8 @@ drm_gem_object_reference(struct drm_gem_object *obj)
 static inline void
 drm_gem_object_unreference(struct drm_gem_object *obj)
 {
+	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
+
 	if (obj != NULL)
 		kref_put(&obj->refcount, drm_gem_object_free);
 }
-- 
2.5.1