Bluetooth: Update hci_disconnect() to return an error value

We'll soon use hci_disconnect() from places that are interested to know
whether the hci_send_cmd() really succeeded or not. This patch updates
hci_disconnect() to pass on any error returned from hci_send_cmd().
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci_core.h

@@ -703,7 +703,7 @@ static inline struct hci_conn *hci_conn_hash_lookup_state(struct hci_dev *hdev,
 	return NULL;
 }
 
-void hci_disconnect(struct hci_conn *conn, __u8 reason);
+int hci_disconnect(struct hci_conn *conn, __u8 reason);
 bool hci_setup_sync(struct hci_conn *conn, __u16 handle);
 void hci_sco_setup(struct hci_conn *conn, __u8 status);
 

net/bluetooth/hci_conn.c

@@ -122,7 +122,7 @@ static void hci_reject_sco(struct hci_conn *conn)
 	hci_send_cmd(conn->hdev, HCI_OP_REJECT_SYNC_CONN_REQ, sizeof(cp), &cp);
 }
 
-void hci_disconnect(struct hci_conn *conn, __u8 reason)
+int hci_disconnect(struct hci_conn *conn, __u8 reason)
 {
 	struct hci_cp_disconnect cp;
 
@@ -132,7 +132,7 @@ void hci_disconnect(struct hci_conn *conn, __u8 reason)
 
 	cp.handle = cpu_to_le16(conn->handle);
 	cp.reason = reason;
-	hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
+	return hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
 }
 
 static void hci_amp_disconn(struct hci_conn *conn)