Bluetooth: Fix incorrectly disabling page scan when toggling connectable

If we have entries in the whitelist we shouldn't disable page scanning
when disabling connectable mode. This patch adds the necessary check to
the Set Connectable command handler.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/mgmt.c

@@ -1881,7 +1881,18 @@ static int set_connectable(struct sock *sk, struct hci_dev *hdev, void *data,
 		if (cp->val) {
 			scan = SCAN_PAGE;
 		} else {
-			scan = 0;
+			/* If we don't have any whitelist entries just
+			 * disable all scanning. If there are entries
+			 * and we had both page and inquiry scanning
+			 * enabled then fall back to only page scanning.
+			 * Otherwise no changes are needed.
+			 */
+			if (list_empty(&hdev->whitelist))
+				scan = SCAN_DISABLED;
+			else if (test_bit(HCI_ISCAN, &hdev->flags))
+				scan = SCAN_PAGE;
+			else
+				goto no_scan_update;
 
 			if (test_bit(HCI_ISCAN, &hdev->flags) &&
 			    hdev->discov_timeout > 0)
@@ -1891,6 +1902,7 @@ static int set_connectable(struct sock *sk, struct hci_dev *hdev, void *data,
 		hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
 	}
 
+no_scan_update:
 	/* If we're going from non-connectable to connectable or
 	 * vice-versa when fast connectable is enabled ensure that fast
 	 * connectable gets disabled. write_fast_connectable won't do