Bluetooth: Change interleaved discovery behavior

According to last discussion on IRC, if an interleaved discovery is
issued, but the device is not dual mode, we should return error
instead of performing a regular BR/EDR or LE-only discovery.
Signed-off-by: NAndre Guedes <andre.guedes@openbossa.org>
Acked-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

net/bluetooth/mgmt.c

@@ -2540,29 +2540,6 @@ static int remove_remote_oob_data(struct sock *sk, u16 index,
 	return err;
 }
 
-static int discovery(struct hci_dev *hdev)
-{
-	int err;
-
-	if (lmp_host_le_capable(hdev)) {
-		if (lmp_bredr_capable(hdev)) {
-			err = hci_le_scan(hdev, LE_SCAN_TYPE,
-						LE_SCAN_INT, LE_SCAN_WIN,
-						LE_SCAN_TIMEOUT_BREDR_LE);
-		} else {
-			hdev->discovery.type = DISCOV_TYPE_LE;
-			err = hci_le_scan(hdev, LE_SCAN_TYPE,
-						LE_SCAN_INT, LE_SCAN_WIN,
-						LE_SCAN_TIMEOUT_LE_ONLY);
-		}
-	} else {
-		hdev->discovery.type = DISCOV_TYPE_BREDR;
-		err = hci_do_inquiry(hdev, INQUIRY_LEN_BREDR);
-	}
-
-	return err;
-}
-
 int mgmt_interleaved_discovery(struct hci_dev *hdev)
 {
 	int err;
@@ -2632,7 +2609,11 @@ static int start_discovery(struct sock *sk, u16 index,
 		break;
 
 	case DISCOV_TYPE_INTERLEAVED:
-		err = discovery(hdev);
+		if (lmp_host_le_capable(hdev) && lmp_bredr_capable(hdev))
+			err = hci_le_scan(hdev, LE_SCAN_TYPE, LE_SCAN_INT,
+					LE_SCAN_WIN, LE_SCAN_TIMEOUT_BREDR_LE);
+		else
+			err = -ENOTSUPP;
 		break;
 
 	default: