Bluetooth: Actively send request for Basic Mode

The Profile Tuning Suite requires that we send a RFC containing the
Basic Mode configuration when requesting Basic Mode.
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap.c

@@ -2492,6 +2492,14 @@ static int l2cap_build_conf_req(struct sock *sk, void *data)
 	case L2CAP_MODE_BASIC:
 		if (pi->imtu != L2CAP_DEFAULT_MTU)
 			l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
+
+		rfc.mode            = L2CAP_MODE_BASIC;
+		rfc.txwin_size      = 0;
+		rfc.max_transmit    = 0;
+		rfc.retrans_timeout = 0;
+		rfc.monitor_timeout = 0;
+		rfc.max_pdu_size    = 0;
+
 		break;
 
 	case L2CAP_MODE_ERTM:
@@ -2504,9 +2512,6 @@ static int l2cap_build_conf_req(struct sock *sk, void *data)
 		if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
 			rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
 
-		l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
-					sizeof(rfc), (unsigned long) &rfc);
-
 		if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
 			break;
 
@@ -2527,9 +2532,6 @@ static int l2cap_build_conf_req(struct sock *sk, void *data)
 		if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
 			rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
 
-		l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
-					sizeof(rfc), (unsigned long) &rfc);
-
 		if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
 			break;
 
@@ -2541,6 +2543,9 @@ static int l2cap_build_conf_req(struct sock *sk, void *data)
 		break;
 	}
 
+	l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
+						(unsigned long) &rfc);
+
 	/* FIXME: Need actual value of the flush timeout */
 	//if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
 	//   l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);