The following commit has been merged in the next branch: commit f4edfc109cb1594d52e216d1a2d7826e20195c58 Author: Marek Lindner lindner_marek@yahoo.de Date: Fri Feb 18 12:28:11 2011 +0000

batman-adv: increase refcount in create_neighbor to be consistent

Signed-off-by: Marek Lindner lindner_marek@yahoo.de

diff --git a/originator.c b/originator.c index a70debe..69e27a2 100644 --- a/originator.c +++ b/originator.c @@ -94,7 +94,9 @@ struct neigh_node *create_neighbor(struct orig_node *orig_node, memcpy(neigh_node->addr, neigh, ETH_ALEN); neigh_node->orig_node = orig_neigh_node; neigh_node->if_incoming = if_incoming; - atomic_set(&neigh_node->refcount, 1); + + /* extra reference for return */ + atomic_set(&neigh_node->refcount, 2);

spin_lock_bh(&orig_node->neigh_list_lock); hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); diff --git a/routing.c b/routing.c index 9863c03..c4b7ae9 100644 --- a/routing.c +++ b/routing.c @@ -150,7 +150,7 @@ static int is_bidirectional_neigh(struct orig_node *orig_node, struct batman_if *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); - struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; + struct neigh_node *neigh_node = NULL, *tmp_neigh_node; struct hlist_node *node; unsigned char total_count; uint8_t orig_eq_count, neigh_rq_count, tq_own; @@ -161,27 +161,27 @@ static int is_bidirectional_neigh(struct orig_node *orig_node, hlist_for_each_entry_rcu(tmp_neigh_node, node, &orig_node->neigh_list, list) {

- if (compare_eth(tmp_neigh_node->addr, - orig_neigh_node->orig) && - (tmp_neigh_node->if_incoming == if_incoming)) - neigh_node = tmp_neigh_node; + if (!compare_eth(tmp_neigh_node->addr, + orig_neigh_node->orig)) + continue; + + if (tmp_neigh_node->if_incoming != if_incoming) + continue; + + if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) + continue; + + neigh_node = tmp_neigh_node; } + rcu_read_unlock();

if (!neigh_node) neigh_node = create_neighbor(orig_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); - /* create_neighbor failed, return 0 */ if (!neigh_node) - goto unlock; - - if (!atomic_inc_not_zero(&neigh_node->refcount)) { - neigh_node = NULL; - goto unlock; - } - - rcu_read_unlock(); + goto out;

neigh_node->last_valid = jiffies; } else { @@ -190,27 +190,27 @@ static int is_bidirectional_neigh(struct orig_node *orig_node, hlist_for_each_entry_rcu(tmp_neigh_node, node, &orig_neigh_node->neigh_list, list) {

- if (compare_eth(tmp_neigh_node->addr, - orig_neigh_node->orig) && - (tmp_neigh_node->if_incoming == if_incoming)) - neigh_node = tmp_neigh_node; + if (!compare_eth(tmp_neigh_node->addr, + orig_neigh_node->orig)) + continue; + + if (tmp_neigh_node->if_incoming != if_incoming) + continue; + + if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) + continue; + + neigh_node = tmp_neigh_node; } + rcu_read_unlock();

if (!neigh_node) neigh_node = create_neighbor(orig_neigh_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); - /* create_neighbor failed, return 0 */ if (!neigh_node) - goto unlock; - - if (!atomic_inc_not_zero(&neigh_node->refcount)) { - neigh_node = NULL; - goto unlock; - } - - rcu_read_unlock(); + goto out; }

orig_node->last_valid = jiffies; @@ -265,10 +265,6 @@ static int is_bidirectional_neigh(struct orig_node *orig_node, if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) ret = 1;

- goto out; - -unlock: - rcu_read_unlock(); out: if (neigh_node) neigh_node_free_ref(neigh_node); @@ -423,11 +419,6 @@ static void update_orig(struct bat_priv *bat_priv, orig_node_free_ref(orig_tmp); if (!neigh_node) goto unlock; - - if (!atomic_inc_not_zero(&neigh_node->refcount)) { - neigh_node = NULL; - goto unlock; - } } else bat_dbg(DBG_BATMAN, bat_priv, "Updating existing last-hop neighbor of originator\n");