Bluetooth: hci_sync: Cleanup hci_conn if it cannot be aborted

This attempts to cleanup the hci_conn if it cannot be aborted as
otherwise it would likely result in having the controller and host
stack out of sync with respect to connection handle.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Author: Vudentz

include/net/bluetooth/hci_core.h

@@ -1156,7 +1156,7 @@ int hci_conn_switch_role(struct hci_conn *conn, __u8 role);
 
 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active);
 
-void hci_le_conn_failed(struct hci_conn *conn, u8 status);
+void hci_conn_failed(struct hci_conn *conn, u8 status);
 
 /*
  * hci_conn_get() and hci_conn_put() are used to control the life-time of an

net/bluetooth/hci_conn.c

@@ -670,7 +670,7 @@ static void le_conn_timeout(struct work_struct *work)
 		/* Disable LE Advertising */
 		le_disable_advertising(hdev);
 		hci_dev_lock(hdev);
-		hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
+		hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 		hci_dev_unlock(hdev);
 		return;
 	}
@@ -873,7 +873,7 @@ struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
 EXPORT_SYMBOL(hci_get_route);
 
 /* This function requires the caller holds hdev->lock */
-void hci_le_conn_failed(struct hci_conn *conn, u8 status)
+static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 {
 	struct hci_dev *hdev = conn->hdev;
 	struct hci_conn_params *params;
@@ -886,8 +886,6 @@ void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 		params->conn = NULL;
 	}
 
-	conn->state = BT_CLOSED;
-
 	/* If the status indicates successful cancellation of
 	 * the attempt (i.e. Unknown Connection Id) there's no point of
 	 * notifying failure since we'll go back to keep trying to
@@ -899,10 +897,6 @@ void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 		mgmt_connect_failed(hdev, &conn->dst, conn->type,
 				    conn->dst_type, status);
 
-	hci_connect_cfm(conn, status);
-
-	hci_conn_del(conn);
-
 	/* Since we may have temporarily stopped the background scanning in
 	 * favor of connection establishment, we should restart it.
 	 */
@@ -914,6 +908,28 @@ void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 	hci_enable_advertising(hdev);
 }
 
+/* This function requires the caller holds hdev->lock */
+void hci_conn_failed(struct hci_conn *conn, u8 status)
+{
+	struct hci_dev *hdev = conn->hdev;
+
+	bt_dev_dbg(hdev, "status 0x%2.2x", status);
+
+	switch (conn->type) {
+	case LE_LINK:
+		hci_le_conn_failed(conn, status);
+		break;
+	case ACL_LINK:
+		mgmt_connect_failed(hdev, &conn->dst, conn->type,
+				    conn->dst_type, status);
+		break;
+	}
+
+	conn->state = BT_CLOSED;
+	hci_connect_cfm(conn, status);
+	hci_conn_del(conn);
+}
+
 static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err)
 {
 	struct hci_conn *conn = data;

net/bluetooth/hci_event.c

@@ -2834,7 +2834,7 @@ static void hci_cs_le_create_conn(struct hci_dev *hdev, u8 status)
 	bt_dev_dbg(hdev, "status 0x%2.2x", status);
 
 	/* All connection failure handling is taken care of by the
-	 * hci_le_conn_failed function which is triggered by the HCI
+	 * hci_conn_failed function which is triggered by the HCI
 	 * request completion callbacks used for connecting.
 	 */
 	if (status)
@@ -2859,7 +2859,7 @@ static void hci_cs_le_ext_create_conn(struct hci_dev *hdev, u8 status)
 	bt_dev_dbg(hdev, "status 0x%2.2x", status);
 
 	/* All connection failure handling is taken care of by the
-	 * hci_le_conn_failed function which is triggered by the HCI
+	 * hci_conn_failed function which is triggered by the HCI
 	 * request completion callbacks used for connecting.
 	 */
 	if (status)
@@ -3179,12 +3179,7 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, void *data,
 
 done:
 	if (status) {
-		conn->state = BT_CLOSED;
-		if (conn->type == ACL_LINK)
-			mgmt_connect_failed(hdev, &conn->dst, conn->type,
-					    conn->dst_type, status);
-		hci_connect_cfm(conn, status);
-		hci_conn_del(conn);
+		hci_conn_failed(conn, status);
 	} else if (ev->link_type == SCO_LINK) {
 		switch (conn->setting & SCO_AIRMODE_MASK) {
 		case SCO_AIRMODE_CVSD:
@@ -5623,7 +5618,7 @@ static void le_conn_complete_evt(struct hci_dev *hdev, u8 status,
 	}
 
 	if (status) {
-		hci_le_conn_failed(conn, status);
+		hci_conn_failed(conn, status);
 		goto unlock;
 	}
 

net/bluetooth/hci_sync.c

@@ -4408,12 +4408,21 @@ static int hci_reject_conn_sync(struct hci_dev *hdev, struct hci_conn *conn,
 static int hci_abort_conn_sync(struct hci_dev *hdev, struct hci_conn *conn,
 			       u8 reason)
 {
+	int err;
+
 	switch (conn->state) {
 	case BT_CONNECTED:
 	case BT_CONFIG:
 		return hci_disconnect_sync(hdev, conn, reason);
 	case BT_CONNECT:
-		return hci_connect_cancel_sync(hdev, conn);
+		err = hci_connect_cancel_sync(hdev, conn);
+		/* Cleanup hci_conn object if it cannot be cancelled as it
+		 * likelly means the controller and host stack are out of sync.
+		 */
+		if (err)
+			hci_conn_failed(conn, err);
+
+		return err;
 	case BT_CONNECT2:
 		return hci_reject_conn_sync(hdev, conn, reason);
 	default: