If we don't have anything to sync, don't add a EV_SYN event

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index 445cc54..8d339f4 100644 (file)
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -426,11 +426,14 @@ sync_state(struct libevdev *dev)
        if (rc == 0 && libevdev_has_event_code(dev, EV_ABS, ABS_MT_SLOT))
                rc = sync_mt_state(dev);
 
-       ev = queue_push(dev);
-       init_event(dev, ev, EV_SYN, SYN_REPORT, 0);
-
        dev->queue_nsync = queue_num_elements(dev);
 
+       if (dev->queue_nsync > 0) {
+               ev = queue_push(dev);
+               init_event(dev, ev, EV_SYN, SYN_REPORT, 0);
+               dev->queue_nsync++;
+       }
+
        return rc;
 }