Bluetooth: hci_sync: Rework background scan

This replaces the use of hci_update_background_scan with
hci_update_passive_scan which runs from cmd_work_sync and deal properly
with resolving list when LL privacy is enabled.

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

Author: Vudentz

net/bluetooth/hci_conn.c

@@ -108,7 +108,7 @@ static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
 		break;
 	}
 
-	hci_update_background_scan(hdev);
+	hci_update_passive_scan(hdev);
 }
 
 static void hci_conn_cleanup(struct hci_conn *conn)
@@ -913,7 +913,7 @@ void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 	/* Since we may have temporarily stopped the background scanning in
 	 * favor of connection establishment, we should restart it.
 	 */
-	hci_update_background_scan(hdev);
+	hci_update_passive_scan(hdev);
 
 	/* Re-enable advertising in case this was a failed connection
 	 * attempt as a peripheral.
@@ -1411,7 +1411,7 @@ struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
 	conn->conn_timeout = conn_timeout;
 	conn->conn_reason = conn_reason;
 
-	hci_update_background_scan(hdev);
+	hci_update_passive_scan(hdev);
 
 done:
 	hci_conn_hold(conn);

net/bluetooth/hci_core.c

@@ -975,7 +975,7 @@ void hci_discovery_set_state(struct hci_dev *hdev, int state)
 
 	switch (state) {
 	case DISCOVERY_STOPPED:
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 
 		if (old_state != DISCOVERY_STARTING)
 			mgmt_discovering(hdev, 0);
@@ -1850,7 +1850,7 @@ int hci_dev_reset_stat(__u16 dev)
 	return ret;
 }
 
-static void hci_update_scan_state(struct hci_dev *hdev, u8 scan)
+static void hci_update_passive_scan_state(struct hci_dev *hdev, u8 scan)
 {
 	bool conn_changed, discov_changed;
 
@@ -1951,7 +1951,7 @@ int hci_dev_cmd(unsigned int cmd, void __user *arg)
 		 * get correctly modified as this was a non-mgmt change.
 		 */
 		if (!err)
-			hci_update_scan_state(hdev, dr.dev_opt);
+			hci_update_passive_scan_state(hdev, dr.dev_opt);
 		break;
 
 	case HCISETLINKPOL:
@@ -3096,7 +3096,7 @@ bool hci_add_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor,
 
 	switch (hci_get_adv_monitor_offload_ext(hdev)) {
 	case HCI_ADV_MONITOR_EXT_NONE:
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 		bt_dev_dbg(hdev, "%s add monitor status %d", hdev->name, *err);
 		/* Message was not forwarded to controller - not an error */
 		return false;
@@ -3160,7 +3160,7 @@ bool hci_remove_single_adv_monitor(struct hci_dev *hdev, u16 handle, int *err)
 
 	pending = hci_remove_adv_monitor(hdev, monitor, handle, err);
 	if (!*err && !pending)
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 
 	bt_dev_dbg(hdev, "%s remove monitor handle %d, status %d, %spending",
 		   hdev->name, handle, *err, pending ? "" : "not ");
@@ -3192,7 +3192,7 @@ bool hci_remove_all_adv_monitor(struct hci_dev *hdev, int *err)
 	}
 
 	if (update)
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 
 	bt_dev_dbg(hdev, "%s remove all monitors status %d, %spending",
 		   hdev->name, *err, pending ? "" : "not ");
@@ -3486,7 +3486,7 @@ void hci_conn_params_del(struct hci_dev *hdev, bdaddr_t *addr, u8 addr_type)
 
 	hci_conn_params_free(params);
 
-	hci_update_background_scan(hdev);
+	hci_update_passive_scan(hdev);
 
 	BT_DBG("addr %pMR (type %u)", addr, addr_type);
 }

net/bluetooth/hci_event.c

@@ -3028,7 +3028,7 @@ static void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		case HCI_AUTO_CONN_ALWAYS:
 			list_del_init(&params->action);
 			list_add(&params->action, &hdev->pend_le_conns);
-			hci_update_background_scan(hdev);
+			hci_update_passive_scan(hdev);
 			break;
 
 		default:
@@ -5471,7 +5471,7 @@ static void le_conn_complete_evt(struct hci_dev *hdev, u8 status,
 	}
 
 unlock:
-	hci_update_background_scan(hdev);
+	hci_update_passive_scan(hdev);
 	hci_dev_unlock(hdev);
 }
 

net/bluetooth/hci_sync.c

@@ -2029,5 +2029,14 @@ static int update_passive_scan_sync(struct hci_dev *hdev, void *data)
 
 int hci_update_passive_scan(struct hci_dev *hdev)
 {
+	/* Only queue if it would have any effect */
+	if (!test_bit(HCI_UP, &hdev->flags) ||
+	    test_bit(HCI_INIT, &hdev->flags) ||
+	    hci_dev_test_flag(hdev, HCI_SETUP) ||
+	    hci_dev_test_flag(hdev, HCI_CONFIG) ||
+	    hci_dev_test_flag(hdev, HCI_AUTO_OFF) ||
+	    hci_dev_test_flag(hdev, HCI_UNREGISTER))
+		return 0;
+
 	return hci_cmd_sync_queue(hdev, update_passive_scan_sync, NULL, NULL);
 }

net/bluetooth/mgmt.c

@@ -1585,7 +1585,7 @@ static int set_connectable_update_settings(struct hci_dev *hdev,
 
 	if (changed) {
 		hci_req_update_scan(hdev);
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 		return new_settings(hdev, sk);
 	}
 
@@ -1943,7 +1943,7 @@ static void le_enable_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 			__hci_req_update_scan_rsp_data(&req, 0x00);
 		}
 		hci_req_run(&req, NULL);
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 	}
 
 unlock:
@@ -4488,7 +4488,7 @@ int mgmt_add_adv_patterns_monitor_complete(struct hci_dev *hdev, u8 status)
 		hdev->adv_monitors_cnt++;
 		if (monitor->state == ADV_MONITOR_STATE_NOT_REGISTERED)
 			monitor->state = ADV_MONITOR_STATE_REGISTERED;
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 	}
 
 	err = mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
@@ -4714,7 +4714,7 @@ int mgmt_remove_adv_monitor_complete(struct hci_dev *hdev, u8 status)
 	rp.monitor_handle = cp->monitor_handle;
 
 	if (!status)
-		hci_update_background_scan(hdev);
+		hci_update_passive_scan(hdev);
 
 	err = mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
 				mgmt_status(status), &rp, sizeof(rp));

net/bluetooth/msft.c

@@ -168,7 +168,7 @@ static void reregister_monitor(struct hci_dev *hdev, int handle)
 		if (!monitor) {
 			/* All monitors have been reregistered */
 			msft->reregistering = false;
-			hci_update_background_scan(hdev);
+			hci_update_passive_scan(hdev);
 			return;
 		}