HCI_CMD_DRAIN_WORKQUEUE
hci_dev_test_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE))
hci_dev_set_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE);
hci_dev_clear_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE);
if (!hci_dev_test_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE))