L2CAP_NULL_CID
if (chan->lc_lcid != L2CAP_NULL_CID || chan->lc_state != L2CAP_CLOSED)
L2CAP_NULL_CID, cp.dcid);
if (chan->lc_lcid != L2CAP_NULL_CID) {
chan->lc_lcid = L2CAP_NULL_CID;
if (chan->lc_lcid != L2CAP_NULL_CID)
chan->lc_lcid = L2CAP_NULL_CID;
chan->lc_rcid = L2CAP_NULL_CID;