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error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td);		error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td);
}		}

dev_relthread(dev, ref);		dev_relthread(dev, ref);
if (error == ENOIOCTL)		if (error == ENOIOCTL)
error = ENOTTY;		error = ENOTTY;

if (error == 0 && com == TIOCSCTTY) {		if (error == 0 && com == TIOCSCTTY) {
/* Do nothing if reassigning same control tty */		/*
		* Do nothing if reassigning same control tty, or if the
		* control tty has already disappeared. If it disappeared,
		* it's because we were racing with TIOCNOTTY. TIOCNOTTY
		* already took care of releasing the old vnode and we have
		* nothing left to do.
		*/
sx_slock(&proctree_lock);		sx_slock(&proctree_lock);
if (td->td_proc->p_session->s_ttyvp == vp) {		if (td->td_proc->p_session->s_ttyvp == vp \|\|
		td->td_proc->p_session->s_ttyp == NULL) {
sx_sunlock(&proctree_lock);		sx_sunlock(&proctree_lock);
return (0);		return (0);
}		}

vpold = td->td_proc->p_session->s_ttyvp;		vpold = td->td_proc->p_session->s_ttyvp;
VREF(vp);		VREF(vp);
SESS_LOCK(td->td_proc->p_session);		SESS_LOCK(td->td_proc->p_session);
td->td_proc->p_session->s_ttyvp = vp;		td->td_proc->p_session->s_ttyvp = vp;
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