ldisc: Make sure the ldisc isn't active when we close it

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c
index 94b3e06..874c248 100644 (file)
--- a/drivers/char/tty_ldisc.c
+++ b/drivers/char/tty_ldisc.c
@@ -793,6 +793,8 @@ void tty_ldisc_hangup(struct tty_struct *tty)
                /* Avoid racing set_ldisc */
                mutex_lock(&tty->ldisc_mutex);
                /* Switch back to N_TTY */
+               tty_ldisc_halt(tty);
+               tty_ldisc_wait_idle(tty);
                tty_ldisc_reinit(tty);
                /* At this point we have a closed ldisc and we want to
                   reopen it. We could defer this to the next open but