diff options
Diffstat (limited to 'drivers/tty/tty_ldisc.c')
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 46 |
1 files changed, 23 insertions, 23 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index f26ef1ace4f1..4e46c1721b9d 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -179,6 +179,29 @@ static struct tty_ldisc *tty_ldisc_get(int disc) return ld; } +/** + * tty_ldisc_put - release the ldisc + * + * Complement of tty_ldisc_get(). + */ +static inline void tty_ldisc_put(struct tty_ldisc *ld) +{ + unsigned long flags; + + if (WARN_ON_ONCE(!ld)) + return; + + raw_spin_lock_irqsave(&tty_ldisc_lock, flags); + + /* unreleased reader reference(s) will cause this WARN */ + WARN_ON(!atomic_dec_and_test(&ld->users)); + + ld->ops->refcount--; + module_put(ld->ops->owner); + kfree(ld); + raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags); +} + static void *tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos) { return (*pos < NR_LDISCS) ? pos : NULL; @@ -329,29 +352,6 @@ void tty_ldisc_deref(struct tty_ldisc *ld) EXPORT_SYMBOL_GPL(tty_ldisc_deref); /** - * tty_ldisc_put - release the ldisc - * - * Complement of tty_ldisc_get(). - */ -static inline void tty_ldisc_put(struct tty_ldisc *ld) -{ - unsigned long flags; - - if (WARN_ON_ONCE(!ld)) - return; - - raw_spin_lock_irqsave(&tty_ldisc_lock, flags); - - /* unreleased reader reference(s) will cause this WARN */ - WARN_ON(!atomic_dec_and_test(&ld->users)); - - ld->ops->refcount--; - module_put(ld->ops->owner); - kfree(ld); - raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags); -} - -/** * tty_ldisc_enable - allow ldisc use * @tty: terminal to activate ldisc on * |