Bluetooth: LE scan should send Discovering events

Send MGMT Discovering events once LE scan starts/stops so the
userspace can track when local adapters are discovering LE devices.

This way, we also keep the same behavior of inquiry which sends MGMT
Discovering events once inquiry starts/stops even if it is triggered
by an external tool (e.g. hcitool).
Signed-off-by: NAndre Guedes <andre.guedes@openbossa.org>
Acked-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/hci_core.h

@@ -61,6 +61,7 @@ struct discovery_state {
 		DISCOVERY_STOPPED,
 		DISCOVERY_STARTING,
 		DISCOVERY_INQUIRY,
+		DISCOVERY_LE_SCAN,
 		DISCOVERY_RESOLVING,
 		DISCOVERY_STOPPING,
 	} state;

net/bluetooth/hci_core.c

@@ -361,6 +361,7 @@ bool hci_discovery_active(struct hci_dev *hdev)
 	struct discovery_state *discov = &hdev->discovery;
 
 	if (discov->state == DISCOVERY_INQUIRY ||
+					discov->state == DISCOVERY_LE_SCAN ||
 					discov->state == DISCOVERY_RESOLVING)
 		return true;
 
@@ -381,6 +382,7 @@ void hci_discovery_set_state(struct hci_dev *hdev, int state)
 	case DISCOVERY_STARTING:
 		break;
 	case DISCOVERY_INQUIRY:
+	case DISCOVERY_LE_SCAN:
 		mgmt_discovering(hdev, 1);
 		break;
 	case DISCOVERY_RESOLVING:

net/bluetooth/hci_event.c

@@ -1056,12 +1056,17 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
 
 		hci_dev_lock(hdev);
 		hci_adv_entries_clear(hdev);
+		hci_discovery_set_state(hdev, DISCOVERY_LE_SCAN);
 		hci_dev_unlock(hdev);
 		break;
 
 	case LE_SCANNING_DISABLED:
 		clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
 
+		hci_dev_lock(hdev);
+		hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
+		hci_dev_unlock(hdev);
+
 		schedule_delayed_work(&hdev->adv_work, ADV_CLEAR_TIMEOUT);
 		break;