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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>
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@ -793,6 +793,8 @@ void tty_ldisc_hangup(struct tty_struct *tty)
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/* Avoid racing set_ldisc */
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mutex_lock(&tty->ldisc_mutex);
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/* Switch back to N_TTY */
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tty_ldisc_halt(tty);
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tty_ldisc_wait_idle(tty);
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tty_ldisc_reinit(tty);
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/* At this point we have a closed ldisc and we want to
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reopen it. We could defer this to the next open but
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