diff --git a/[refs] b/[refs]
index cbd9e37d04c1..69d0ac9620b0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 52856ed732aeab5e8e0b7c9e2a7a3d31736218ab
+refs/heads/master: 677ca3060c474d7d89941948e32493d9c18c52d2
diff --git a/trunk/drivers/char/tty_ldisc.c b/trunk/drivers/char/tty_ldisc.c
index 874c2486c034..a19e935847b0 100644
--- a/trunk/drivers/char/tty_ldisc.c
+++ b/trunk/drivers/char/tty_ldisc.c
@@ -207,6 +207,7 @@ static void tty_ldisc_put(struct tty_ldisc *ld)
 	ldo->refcount--;
 	module_put(ldo->owner);
 	spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+	WARN_ON(ld->refcount);
 	kfree(ld);
 }