cancel_work
cancelled = cancel_work(up_token);
if (cancel_work(down_token)) {
if (cancel_work(up_token)) {
static boolean_t cancel_work(work_token_t *);
if (cancel_work(&path->work_token[RSMKA_IPC_UP_INDEX])) {
if (cancel_work(&path->work_token[RSMKA_IPC_DOWN_INDEX])) {