[PATCH 09/20] drm/gem: WARN about unbalanced handle refcounts

[Daniel Vetter]

Trying to drop a reference we don't have is a pretty serious bug.
Trying to paper over it is an even worse offense.

So scream into dmesg with a big WARN in case that ever happens.

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

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 5d41af1..b07519e 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -247,7 +247,7 @@ static void drm_gem_object_handle_free(struct drm_gem_object *obj)
 void
 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
 {
-	if (atomic_read(&obj->handle_count) == 0)
+	if (WARN_ON(atomic_read(&obj->handle_count) == 0))
 		return;
 
 	/*
-- 
1.8.3.2