UCOM_FLAG_ATTACHED
ssc->sc_flag = UCOM_FLAG_ATTACHED |
sc[subunit].sc_flag |= UCOM_FLAG_ATTACHED;
if (!(ssc->sc_flag & UCOM_FLAG_ATTACHED))
if (sc[subunit].sc_flag & UCOM_FLAG_ATTACHED) {
sc[subunit].sc_flag &= ~UCOM_FLAG_ATTACHED;
ssc->sc_flag &= ~UCOM_FLAG_ATTACHED;