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
--- a/drivers/char/tty_ldisc.c
+++ b/drivers/char/tty_ldisc.c
@@ -793,6 +793,8 @@
/* 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