1 files changed, 4 insertions, 0 deletions

diff --git a/sys/xen/xenbus/xenbus_probe.c b/sys/xen/xenbus/xenbus_probe.c
index f04f8eca46382..f930c8ff71b90 100644
--- a/sys/xen/xenbus/xenbus_probe.c
+++ b/sys/xen/xenbus/xenbus_probe.c
@@ -348,7 +348,9 @@ xenbus_devices_changed(struct xenbus_watch *watch,
 	if (p)
 		*p = 0;
 
+	newbus_xlock();
 	xenbus_add_device(dev, bus, type, id);
+	newbus_xunlock();
 	taskqueue_enqueue(taskqueue_thread, &sc->xs_probechildren);
 out:
 	free(node, M_DEVBUF);
@@ -361,7 +363,9 @@ xenbus_attach_deferred(void *arg)
 	struct xenbus_softc *sc = device_get_softc(dev);
 	int error;
 	
+	newbus_xlock();
 	error = xenbus_enumerate_bus(dev, "device");
+	newbus_xunlock();
 	if (error)
 		return;
 	xenbus_probe_children(dev);