qxl: handle no updates in interface_update_area_complete

Simply return early in case there are no updated rects.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1465395101-13580-1-git-send-email-kraxel@redhat.com

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index ab96f24..47cc6f4 100644 (file)
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -893,7 +893,8 @@ static void interface_update_area_complete(QXLInstance *sin,
     int qxl_i;
 
     qemu_mutex_lock(&qxl->ssd.lock);
-    if (surface_id != 0 || !qxl->render_update_cookie_num) {
+    if (surface_id != 0 || !num_updated_rects ||
+        !qxl->render_update_cookie_num) {
         qemu_mutex_unlock(&qxl->ssd.lock);
         return;
     }