tty: Don't protect atomic operation with mutex
test_bit() is already atomic; drop mutex lock/unlock. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1391,9 +1391,7 @@ static int tty_reopen(struct tty_struct *tty)
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}
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tty->count++;
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mutex_lock(&tty->ldisc_mutex);
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WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
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mutex_unlock(&tty->ldisc_mutex);
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return 0;
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}
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