ztimer/periodic: reinit stop and handle aquire

sys/ztimer/periodic.c

@@ -57,18 +57,22 @@ void ztimer_periodic_init(ztimer_clock_t *clock, ztimer_periodic_t *timer,
  bool (*callback)(
  void *), void *arg, uint32_t interval)
 {
- ztimer_remove(clock, &timer->timer);
+ /* check if this is a reinit, ensure timer is stopped in case */
+ if (timer->timer.callback == _ztimer_periodic_callback) {
+ ztimer_periodic_stop(timer);
+ }
  *timer =
  (ztimer_periodic_t){ .clock = clock, .interval = interval,
  .callback = callback, .arg = arg,
  .timer = {
- .callback = _ztimer_periodic_callback,
- .arg = timer
+ .callback = _ztimer_periodic_callback
  } };
 }
 
 void ztimer_periodic_start(ztimer_periodic_t *timer)
 {
+ ztimer_periodic_stop(timer);
+ timer->timer.arg = timer;
  ztimer_acquire(timer->clock);
 
  uint32_t now = ztimer_now(timer->clock);
@@ -79,7 +83,9 @@ void ztimer_periodic_start(ztimer_periodic_t *timer)
 
 void ztimer_periodic_stop(ztimer_periodic_t *timer)
 {
- ztimer_remove(timer->clock, &timer->timer);
-
- ztimer_release(timer->clock);
+ if (timer->timer.arg == timer) {
+ ztimer_remove(timer->clock, &timer->timer);
+ ztimer_release(timer->clock);
+ timer->timer.arg = NULL;
+ }
 }