L2CAP_PSMLEN_SIZE
int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
skb_pull(skb, L2CAP_PSMLEN_SIZE);