diff options
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index 2d822aa259b2..332a622b7203 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -764,6 +764,8 @@ static void tty_ldisc_kill(struct tty_struct *tty) * Called during the final close of a tty/pty pair in order to shut down * the line discpline layer. On exit the ldisc assigned is N_TTY and the * ldisc has not been opened. + * + * Holding ldisc_sem write lock serializes tty->ldisc changes. */ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty) @@ -776,13 +778,9 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty) tty_ldisc_debug(tty, "closing ldisc: %p\n", tty->ldisc); tty_ldisc_lock_pair(tty, o_tty); - tty_lock_pair(tty, o_tty); - tty_ldisc_kill(tty); if (o_tty) tty_ldisc_kill(o_tty); - - tty_unlock_pair(tty, o_tty); tty_ldisc_unlock_pair(tty, o_tty); /* And the memory resources remaining (buffers, termios) will be |