diff options
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index b66a81d0549e..3737f55272d2 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -572,8 +572,11 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) tty_ldisc_restore(tty, old_ldisc); } - if (tty->ldisc->ops->num != old_ldisc->ops->num && tty->ops->set_ldisc) + if (tty->ldisc->ops->num != old_ldisc->ops->num && tty->ops->set_ldisc) { + down_read(&tty->termios_rwsem); tty->ops->set_ldisc(tty); + up_read(&tty->termios_rwsem); + } /* At this point we hold a reference to the new ldisc and a reference to the old ldisc, or we hold two references to |