diff options
| -rw-r--r-- | common/cyclic.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/common/cyclic.c b/common/cyclic.c index 2bc3c773f27..1cf5b25d1d8 100644 --- a/common/cyclic.c +++ b/common/cyclic.c @@ -63,6 +63,19 @@ static void cyclic_run(void) struct hlist_node *tmp; u64 now, after, cpu_time; + /* + * Nothing to do if the list is empty. Also, schedule() can be + * called before timer infrastructure is ready, in which case + * calling get_timer_us() before the (empty) loop could cause + * a divide-by-0 or otherwise crash the system. No clients + * should be registered before the timer infrastructure is up, + * so the check for the list being empty should be + * ok. Otherwise, we would need a new GD_FLG_TIMERS_READY + * flag. + */ + if (hlist_empty(&gd->cyclic_list)) + return; + /* Prevent recursion */ if (gd->flags & GD_FLG_CYCLIC_RUNNING) return; |