Bluetooth: Add status parameter to mgmt_disconnect response

Since disconnecting may fail the status needs to be communicated to user
space. This also updates the implementation to match the latest mgmt API
specification.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/hci_core.h

@@ -919,7 +919,7 @@ int mgmt_connected(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 								u8 addr_type);
 int mgmt_disconnected(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 								u8 addr_type);
-int mgmt_disconnect_failed(struct hci_dev *hdev);
+int mgmt_disconnect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 status);
 int mgmt_connect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 						u8 addr_type, u8 status);
 int mgmt_pin_code_request(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 secure);

include/net/bluetooth/mgmt.h

@@ -130,6 +130,7 @@ struct mgmt_cp_disconnect {
 } __packed;
 struct mgmt_rp_disconnect {
 	bdaddr_t bdaddr;
+	__u8 status;
 } __packed;
 
 #define MGMT_ADDR_BREDR			0x00

net/bluetooth/hci_event.c

@@ -1605,27 +1605,27 @@ static inline void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff
 
 	BT_DBG("%s status %d", hdev->name, ev->status);
 
-	if (ev->status) {
-		hci_dev_lock(hdev);
-		mgmt_disconnect_failed(hdev);
-		hci_dev_unlock(hdev);
-		return;
-	}
-
 	hci_dev_lock(hdev);
 
 	conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
 	if (!conn)
 		goto unlock;
 
+	if (ev->status == 0)
 		conn->state = BT_CLOSED;
 
-	if (conn->type == ACL_LINK || conn->type == LE_LINK)
+	if (conn->type == ACL_LINK || conn->type == LE_LINK) {
+		if (ev->status != 0)
+			mgmt_disconnect_failed(hdev, &conn->dst, ev->status);
+		else
 			mgmt_disconnected(hdev, &conn->dst, conn->type,
 							conn->dst_type);
+	}
 
+	if (ev->status == 0) {
 		hci_proto_disconn_cfm(conn, ev->reason);
 		hci_conn_del(conn);
+	}
 
 unlock:
 	hci_dev_unlock(hdev);
@@ -2098,7 +2098,7 @@ static inline void hci_cmd_status_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
 	case HCI_OP_DISCONNECT:
 		if (ev->status != 0)
-			mgmt_disconnect_failed(hdev);
+			mgmt_disconnect_failed(hdev, NULL, ev->status);
 		break;
 
 	case HCI_OP_LE_CREATE_CONN:

net/bluetooth/mgmt.c

@@ -2128,6 +2128,7 @@ static void disconnect_rsp(struct pending_cmd *cmd, void *data)
 	struct mgmt_rp_disconnect rp;
 
 	bacpy(&rp.bdaddr, &cp->bdaddr);
+	rp.status = 0;
 
 	cmd_complete(cmd->sk, cmd->index, MGMT_OP_DISCONNECT, &rp, sizeof(rp));
 
@@ -2176,7 +2177,7 @@ int mgmt_disconnected(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 	return err;
 }
 
-int mgmt_disconnect_failed(struct hci_dev *hdev)
+int mgmt_disconnect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 status)
 {
 	struct pending_cmd *cmd;
 	int err;
@@ -2185,7 +2186,17 @@ int mgmt_disconnect_failed(struct hci_dev *hdev)
 	if (!cmd)
 		return -ENOENT;
 
-	err = cmd_status(cmd->sk, hdev->id, MGMT_OP_DISCONNECT, EIO);
+	if (bdaddr) {
+		struct mgmt_rp_disconnect rp;
+
+		bacpy(&rp.bdaddr, bdaddr);
+		rp.status = status;
+
+		err = cmd_complete(cmd->sk, cmd->index, MGMT_OP_DISCONNECT,
+							&rp, sizeof(rp));
+	} else
+		err = cmd_status(cmd->sk, hdev->id, MGMT_OP_DISCONNECT,
+								status);
 
 	mgmt_pending_remove(cmd);