Bluetooth: Introduce HCI_MGMT_HDEV_OPTIONAL option

When setting HCI_MGMT_HDEV_OPTIONAL it is possible to target a specific
conntroller or a global interface.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/hci_core.h

@@ -1554,6 +1554,7 @@ void hci_sock_dev_event(struct hci_dev *hdev, int event);
 #define HCI_MGMT_NO_HDEV	BIT(1)
 #define HCI_MGMT_UNTRUSTED	BIT(2)
 #define HCI_MGMT_UNCONFIGURED	BIT(3)
+#define HCI_MGMT_HDEV_OPTIONAL	BIT(4)
 
 struct hci_mgmt_handler {
 	int (*func) (struct sock *sk, struct hci_dev *hdev, void *data,

net/bluetooth/hci_sock.c

@@ -1579,12 +1579,14 @@ static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
 		}
 	}
 
+	if (!(handler->flags & HCI_MGMT_HDEV_OPTIONAL)) {
 		no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
 		if (no_hdev != !hdev) {
 			err = mgmt_cmd_status(sk, index, opcode,
 					      MGMT_STATUS_INVALID_INDEX);
 			goto done;
 		}
+	}
 
 	var_len = (handler->flags & HCI_MGMT_VAR_LEN);
 	if ((var_len && len < handler->data_len) ||