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Make sure we don't remove the preferred parent

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This commit is contained in:
Adam Dunkels 2011-02-14 23:01:11 +01:00
parent 20bf23cf06
commit db37e38156
1 changed files with 11 additions and 5 deletions
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16
core/net/rpl/rpl-dag.c
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@ -120,19 +120,25 @@ remove_parents(rpl_dag_t *dag, rpl_rank_t minimum_rank)
} }
/************************************************************************/ /************************************************************************/
static void static void
remove_worst_parent(rpl_dag_t *dag) remove_worst_parent(rpl_dag_t *dag, rpl_rank_t min_worst_rank)
{ {
rpl_parent_t *p, *worst; rpl_parent_t *p, *worst;
PRINTF("RPL: Removing the worst parent\n"); PRINTF("RPL: Removing the worst parent\n");
/* Find the parent with the highest rank. */
worst = NULL; worst = NULL;
for(p = list_head(dag->parents); p != NULL; p = p->next) { for(p = list_head(dag->parents); p != NULL; p = list_item_next(p)) {
if(worst == NULL || p->rank > worst->rank) { if(p != dag->preferred_parent &&
(worst == NULL || p->rank > worst->rank)) {
worst = p; worst = p;
} }
} }
rpl_remove_parent(dag, worst); /* Remove the neighbor if its rank is worse than the minimum worst
rank. */
if(worst != NULL && worst->rank > min_worst_rank) {
rpl_remove_parent(dag, worst);
}
} }
/************************************************************************/ /************************************************************************/
static int static int
@ -698,7 +704,7 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
if(p == NULL) { if(p == NULL) {
if(RPL_PARENT_COUNT(dag) == RPL_MAX_PARENTS) { if(RPL_PARENT_COUNT(dag) == RPL_MAX_PARENTS) {
/* Make room for a new parent. */ /* Make room for a new parent. */
remove_worst_parent(dag); remove_worst_parent(dag, dio->rank);
} }
/* Add the DIO sender as a candidate parent. */ /* Add the DIO sender as a candidate parent. */