Bluetooth: Refactor hci_connect_le

This patch does some code refactoring in hci_connect_le() by moving
the exception code into if statements and letting the main flow in
first level of function scope. It also adds extra comments to improve
the code readability.
Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_conn.c

@@ -594,8 +594,25 @@ static struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 	if (test_bit(HCI_ADVERTISING, &hdev->flags))
 		return ERR_PTR(-ENOTSUPP);
 
+	/* Some devices send ATT messages as soon as the physical link is
+	 * established. To be able to handle these ATT messages, the user-
+	 * space first establishes the connection and then starts the pairing
+	 * process.
+	 *
+	 * So if a hci_conn object already exists for the following connection
+	 * attempt, we simply update pending_sec_level and auth_type fields
+	 * and return the object found.
+	 */
 	conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
-	if (!conn) {
+	if (conn) {
+		conn->pending_sec_level = sec_level;
+		conn->auth_type = auth_type;
+		goto done;
+	}
+
+	/* Since the controller supports only one LE connection attempt at a
+	 * time, we return -EBUSY if there is any connection attempt running.
+	 */
 	conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 	if (conn)
 		return ERR_PTR(-EBUSY);
@@ -609,17 +626,15 @@ static struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 	conn->out = true;
 	conn->link_mode |= HCI_LM_MASTER;
 	conn->sec_level = BT_SECURITY_LOW;
+	conn->pending_sec_level = sec_level;
+	conn->auth_type = auth_type;
 
 	err = hci_create_le_conn(conn);
 	if (err)
 		return ERR_PTR(err);
-	}
-
-	conn->pending_sec_level = sec_level;
-	conn->auth_type = auth_type;
 
+done:
 	hci_conn_hold(conn);
-
 	return conn;
 }