Bluetooth: Fix trying to initiate connections when acting as LE slave

When we have at least one LE slave connection most (probably all)
controllers will refuse to initiate any new connections. To avoid
unnecessary failures simply check for this situation up-front and skip
the connection attempt.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_event.c

@@ -4246,6 +4246,12 @@ static void check_pending_le_conn(struct hci_dev *hdev, bdaddr_t *addr,
 	if (hci_bdaddr_list_lookup(&hdev->blacklist, addr, addr_type))
 		return;
 
+	/* Most controller will fail if we try to create new connections
+	 * while we have an existing one in slave role.
+	 */
+	if (hdev->conn_hash.le_num_slave > 0)
+		return;
+
 	/* If we're connectable, always connect any ADV_DIRECT_IND event */
 	if (test_bit(HCI_CONNECTABLE, &hdev->dev_flags) &&
 	    adv_type == LE_ADV_DIRECT_IND)