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gtphub: add assertion to ensure expiry ordering. 

Make 100% sure the user adds expiring_items in chronological order by asserting
that a newly added expiry is >= the last expiry in the queue. Add llist_last()
to facilitate.

Sponsored-by: On-Waves ehi
This commit is contained in:
Neels Hofmeyr 2015-11-24 13:32:23 +01:00
parent 508514c7c5
commit 1aa0e47104
1 changed files with 8 additions and 0 deletions
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8
openbsc/src/gprs/gtphub.c
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@ -62,6 +62,10 @@ typedef int (*osmo_fd_cb_t)(struct osmo_fd *fd, unsigned int what);
#define llist_first(head, type, entry) \
llist_entry(__llist_first(head), type, entry)
#define __llist_last(head) (((head)->next == (head)) ? NULL : (head)->prev)
#define llist_last(head, type, entry) \
llist_entry(__llist_last(head), type, entry)
/* TODO move GTP header stuff to openggsn/gtp/ ? See gtp_decaps*() */
enum gtp_rc {
@ -564,6 +568,10 @@ void expiry_add(struct expiry *exq, struct expiring_item *item, time_t now)
{
item->expiry = now + exq->expiry_in_seconds;
OSMO_ASSERT(llist_empty(&exq->items)
|| (item->expiry
>= llist_last(&exq->items, struct expiring_item, entry)->expiry));
/* Add/move to the tail to always sort by expiry, ascending. */
llist_del(&item->entry);
llist_add_tail(&item->entry, &exq->items);