console: add same displaychangelistener registration pre-condition

Catch an invalid state. Mainly useful for documentation purposes. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-id: 20170406120513.638-3-marcandre.lureau@redhat.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
qemu · Apr 24, 2017 · e0665c3 · e0665c3
1 parent 6905b93
commit e0665c3
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/ui/console.c b/ui/console.c
@@ -1410,6 +1410,8 @@ void register_displaychangelistener(DisplayChangeListener *dcl)
     static DisplaySurface *dummy;
     QemuConsole *con;
 
+    assert(!dcl->ds);
+
     if (dcl->ops->dpy_gl_ctx_create) {
         /* display has opengl support */
         assert(dcl->con);