static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
{
	struct sock *sk;

	sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
	if (!sk) {
		BT_DBG("unknown cid 0x%4.4x", cid);
		goto drop;
	}

	BT_DBG("sk %p, len %d", sk, skb->len);

	if (sk->sk_state != BT_CONNECTED)
		goto drop;

	if (l2cap_pi(sk)->imtu < skb->len)
		goto drop;

	/* If socket recv buffers overflows we drop data here
	 * which is *bad* because L2CAP has to be reliable.
	 * But we don't have any other choice. L2CAP doesn't
	 * provide flow control mechanism. */

	if (!sock_queue_rcv_skb(sk, skb))
		goto done;

drop:
	kfree_skb(skb);

done:
	if (sk)
		bh_unlock_sock(sk);

	return 0;
}
static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
{
	struct sock *sk;

	sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
	if (!sk) {
		BT_DBG("unknown cid 0x%4.4x", cid);
		goto drop;
	}

	BT_DBG("sk %p, len %d", sk, skb->len);

	if (sk->sk_state != BT_CONNECTED)
		goto drop;

	if (l2cap_pi(sk)->imtu < skb->len)
		goto drop;

	 

	if (!sock_queue_rcv_skb(sk, skb))
		goto done;

drop:
	kfree_skb(skb);

done:
	if (sk)
		bh_unlock_sock(sk);

	return 0;
}