diff --git a/sys/dev/etherswitch/e6000sw/e6000sw.c b/sys/dev/etherswitch/e6000sw/e6000sw.c
--- a/sys/dev/etherswitch/e6000sw/e6000sw.c
+++ b/sys/dev/etherswitch/e6000sw/e6000sw.c
@@ -650,6 +650,7 @@
 	return (0);
 
 out_fail:
+	E6000SW_UNLOCK(sc);
 	e6000sw_detach(dev);
 
 	return (err);