diff options
Diffstat (limited to 'src/alarm.c')
| -rw-r--r-- | src/alarm.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/alarm.c b/src/alarm.c index 25075ef..0fe80ee 100644 --- a/src/alarm.c +++ b/src/alarm.c @@ -31,6 +31,8 @@ void init_alarm(struct alarm_list *t, void *data, void (*fcn)(struct alarm_list *a, void *data)) { + /* initialize the head to check whether a node is inserted */ + INIT_LIST_HEAD(&t->head); timerclear(&t->tv); t->data = data; t->function = fcn; @@ -61,12 +63,14 @@ void add_alarm(struct alarm_list *alarm) void del_alarm(struct alarm_list *alarm) { - list_del(&alarm->head); + /* don't remove a non-inserted node */ + if (!list_empty(&alarm->head)) + list_del_init(&alarm->head); } void mod_alarm(struct alarm_list *alarm, unsigned long sc, unsigned long usc) { - list_del(&alarm->head); + list_del_init(&alarm->head); set_alarm_expiration(alarm, sc, usc); add_alarm(alarm); } |