diff options
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index 0f2a2c5e704c..47e3968df10b 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -897,6 +897,11 @@ int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty) static void tty_ldisc_kill(struct tty_struct *tty) { + /* There cannot be users from userspace now. But there still might be + * drivers holding a reference via tty_ldisc_ref. Do not steal them the + * ldisc until they are done. */ + tty_ldisc_wait_idle(tty, MAX_SCHEDULE_TIMEOUT); + mutex_lock(&tty->ldisc_mutex); /* * Now kill off the ldisc |