[ospfd] Fix bad SPF calculation on some topologies - incorrect sorting
2007-08-07 Atis Elsts <atis@mikrotik.com>
* ospf_spf.c: (ospf_spf_next) Sort heap in correct direction
after vertex cost is changed, thus fixing incorrect SPF
calculation on certain topologies.
* lib/pqueue.{c,h}: Export trickle_up
diff --git a/ospfd/ospf_spf.c b/ospfd/ospf_spf.c
index 51e3383..41288f1 100644
--- a/ospfd/ospf_spf.c
+++ b/ospfd/ospf_spf.c
@@ -896,9 +896,12 @@
* will flush the old parents
*/
if (ospf_nexthop_calculation (area, v, w, l, distance))
- /* Decrease the key of the node in the heap,
- * re-sort the heap. */
- trickle_down (w_lsa->stat, candidate);
+ /* Decrease the key of the node in the heap.
+ * trickle-sort it up towards root, just in case this
+ * node should now be the new root due the cost change.
+ * (pqueu_{de,en}queue
+ */
+ trickle_up (w_lsa->stat, candidate);
}
} /* end W is already on the candidate list */
} /* end loop over the links in V's LSA */