It is hard to understand why the refcnt is increased when it isn't done near the actual place the new reference is used. So using kref_get right before the place which requires the reference and in the same function helps to avoid accidental problems causedy incorrect reference counting.
Signed-off-by: Sven Eckelmann sven@narfation.org --- v2: - split patch based on type
net/batman-adv/gateway_client.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c index 94f8f9d..afa43d4 100644 --- a/net/batman-adv/gateway_client.c +++ b/net/batman-adv/gateway_client.c @@ -333,14 +333,15 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv, if (!gw_node) return;
+ kref_init(&gw_node->refcount); INIT_HLIST_NODE(&gw_node->list); kref_get(&orig_node->refcount); gw_node->orig_node = orig_node; gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); - kref_init(&gw_node->refcount);
spin_lock_bh(&bat_priv->gw.list_lock); + kref_get(&gw_node->refcount); hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); spin_unlock_bh(&bat_priv->gw.list_lock);
@@ -351,6 +352,9 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv, ntohl(gateway->bandwidth_down) % 10, ntohl(gateway->bandwidth_up) / 10, ntohl(gateway->bandwidth_up) % 10); + + /* don't return reference to new gw_node */ + batadv_gw_node_put(gw_node); }
/**