l2cap_recv_frag
len = l2cap_recv_frag(conn, skb, L2CAP_LEN_SIZE - conn->rx_skb->len);
len = l2cap_recv_frag(conn, rx_skb,
l2cap_recv_frag(conn, skb, conn->mtu);
if (l2cap_recv_frag(conn, skb, len) < 0)
l2cap_recv_frag(conn, skb, skb->len);