Re: [PATCH] (1/4) propgate bridge internal MTU changes

[Stephen Hemminger <shemminger@xxxxxxxx>]

Follow up to earlier RCU patch.  Since now using RCU, need to use
deferred free.  

Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxx>

diff -Nru a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
--- a/net/bridge/br_fdb.c       2004-07-29 11:00:07 -07:00
+++ b/net/bridge/br_fdb.c       2004-07-29 11:00:07 -07:00
@@ -217,11 +217,18 @@
        return fdb;
 }
 
+static void fdb_rcu_free(struct rcu_head *head)
+{
+       struct net_bridge_fdb_entry *ent
+               = container_of(head, struct net_bridge_fdb_entry, rcu);
+       kmem_cache_free(br_fdb_cache, ent);
+}
 
+/* Set entry up for deletion with RCU  */
 void br_fdb_put(struct net_bridge_fdb_entry *ent)
 {
        if (atomic_dec_and_test(&ent->use_count))
-               kmem_cache_free(br_fdb_cache, ent);
+               call_rcu(&ent->rcu, fdb_rcu_free);
 }
 
 /*
diff -Nru a/net/bridge/br_private.h b/net/bridge/br_private.h
--- a/net/bridge/br_private.h   2004-07-29 11:00:07 -07:00
+++ b/net/bridge/br_private.h   2004-07-29 11:00:07 -07:00
@@ -46,7 +46,10 @@
 {
        struct hlist_node               hlist;
        struct net_bridge_port          *dst;
-       struct list_head                age_list;
+       union {
+               struct list_head        age_list;
+               struct rcu_head         rcu;
+       };
        atomic_t                        use_count;
        unsigned long                   ageing_timer;
        mac_addr                        addr;