1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index b64d10b66548..c30ed8d3bcbd 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -182,6 +182,7 @@ struct signal_struct;
 
 struct tty_port {
         struct tty_struct       *tty;           /* Back pointer */
+        spinlock_t              lock;           /* Lock protecting tty field */
         int                     blocked_open;   /* Waiting to open */
         int                     count;          /* Usage count */
         wait_queue_head_t       open_wait;      /* Open waiters */
@@ -405,6 +406,8 @@ extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 extern void tty_port_init(struct tty_port *port);
 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
 extern void tty_port_free_xmit_buf(struct tty_port *port);
+extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
+extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
 
 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 extern int tty_unregister_ldisc(int disc);