diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h
index 0764b66..2919c03 100644
--- a/drivers/char/drm/drmP.h
+++ b/drivers/char/drm/drmP.h
@@ -242,6 +242,12 @@ do {									\
 		DRM_ERROR( "%s called without lock held, held  %d owner %p %p\n",\
 			   __func__, _DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ),\
 			   dev->lock.file_priv, file_priv );		\
+		static int count = 0;					\
+		if (count < 3) {					\
+			dump_stack();					\
+			count++;					\
+			BUG_ON(count == 3);				\
+		}							\
 		return -EINVAL;						\
 	}								\
 } while (0)