diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 75fa99978348db2465cb35bace4e38429f4feaa8..e52d615735538b53c785fe8153a83d5bfd56a18c 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -540,9 +540,6 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 		return 0;
 	}
 
-	/* FIXME: why 'shutoff' input if the ldisc is locked? */
-	tty->receive_room = 0;
-
 	old_ldisc = tty->ldisc;
 	tty_lock(tty);