sna: Assert that flip handler/data exists before invoking

Just an explanatory assert in case we ever jump off into a NULL function
pointer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/sna/xassert.h b/src/sna/xassert.h
index bac70b8a..28796b8a 100644
--- a/src/sna/xassert.h
+++ b/src/sna/xassert.h
@@ -52,8 +52,14 @@
 		__warn_once__ = 1; \
 	} \
 } while (0)
+
+#define dbg(EXPR) EXPR
+
 #else
+
 #define warn_unless(E)
+#define dbg(EXPR)
+
 #endif
 
 #endif /* __XASSERT_H__ */