diff options
Diffstat (limited to 'drivers/tty/tty_ldisc.c')
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index 9362a1030c95..5ee0b2be7d72 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -42,13 +42,6 @@ static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_wait); /* Line disc dispatch table */ static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS]; -static inline struct tty_ldisc *get_ldisc(struct tty_ldisc *ld) -{ - if (ld) - atomic_inc(&ld->users); - return ld; -} - /** * tty_register_ldisc - install a line discipline * @disc: ldisc number @@ -269,10 +262,13 @@ static struct tty_ldisc *tty_ldisc_try(struct tty_struct *tty) unsigned long flags; struct tty_ldisc *ld; + /* FIXME: this allows reference acquire after TTY_LDISC is cleared */ raw_spin_lock_irqsave(&tty_ldisc_lock, flags); ld = NULL; - if (test_bit(TTY_LDISC, &tty->flags)) - ld = get_ldisc(tty->ldisc); + if (test_bit(TTY_LDISC, &tty->flags) && tty->ldisc) { + ld = tty->ldisc; + atomic_inc(&ld->users); + } raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags); return ld; } |