[PATCH net-next v3 2/4] net: bridge: multicast: use non-bh rcu flavor

[Nikolay Aleksandrov]

The bridge multicast code has been using a mix of RCU and RCU-bh flavors
sometimes in questionable way. Since we've moved to rhashtable just use
non-bh RCU everywhere. In addition this simplifies freeing of objects
and allows us to remove some unnecessary callback functions.

v3: new patch

Signed-off-by: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
---
 net/bridge/br_mdb.c       |  2 +-
 net/bridge/br_multicast.c | 26 +++++---------------------
 net/bridge/br_private.h   |  1 -
 3 files changed, 6 insertions(+), 23 deletions(-)

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index ea8abdb56df3..79d4c9d253e0 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -710,7 +710,7 @@ static int __br_mdb_del(struct net_bridge *br, struct 
br_mdb_entry *entry)
                rcu_assign_pointer(*pp, p->next);
                hlist_del_init(&p->mglist);
                del_timer(&p->timer);
-               call_rcu_bh(&p->rcu, br_multicast_free_pg);
+               kfree_rcu(p, rcu);
                err = 0;
 
                if (!mp->ports && !mp->host_joined &&
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 83a5931a7784..5b8cfef8bc4d 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -160,22 +160,6 @@ struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge 
*br,
        return br_mdb_ip_get_rcu(br, &ip);
 }
 
-void br_multicast_free_pg(struct rcu_head *head)
-{
-       struct net_bridge_port_group *p =
-               container_of(head, struct net_bridge_port_group, rcu);
-
-       kfree(p);
-}
-
-static void br_multicast_free_group(struct rcu_head *head)
-{
-       struct net_bridge_mdb_entry *mp =
-               container_of(head, struct net_bridge_mdb_entry, rcu);
-
-       kfree(mp);
-}
-
 static void br_multicast_group_expired(struct timer_list *t)
 {
        struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
@@ -195,7 +179,7 @@ static void br_multicast_group_expired(struct timer_list *t)
                               br_mdb_rht_params);
        hlist_del_rcu(&mp->mdb_node);
 
-       call_rcu_bh(&mp->rcu, br_multicast_free_group);
+       kfree_rcu(mp, rcu);
 
 out:
        spin_unlock(&br->multicast_lock);
@@ -223,7 +207,7 @@ static void br_multicast_del_pg(struct net_bridge *br,
                del_timer(&p->timer);
                br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
                              p->flags);
-               call_rcu_bh(&p->rcu, br_multicast_free_pg);
+               kfree_rcu(p, rcu);
 
                if (!mp->ports && !mp->host_joined &&
                    netif_running(br->dev))
@@ -1425,7 +1409,7 @@ br_multicast_leave_group(struct net_bridge *br,
                        rcu_assign_pointer(*pp, p->next);
                        hlist_del_init(&p->mglist);
                        del_timer(&p->timer);
-                       call_rcu_bh(&p->rcu, br_multicast_free_pg);
+                       kfree_rcu(p, rcu);
                        br_mdb_notify(br->dev, port, group, RTM_DELMDB,
                                      p->flags);
 
@@ -1839,11 +1823,11 @@ void br_multicast_dev_del(struct net_bridge *br)
                rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
                                       br_mdb_rht_params);
                hlist_del_rcu(&mp->mdb_node);
-               call_rcu_bh(&mp->rcu, br_multicast_free_group);
+               kfree_rcu(mp, rcu);
        }
        spin_unlock_bh(&br->multicast_lock);
 
-       rcu_barrier_bh();
+       rcu_barrier();
 }
 
 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index a0ce0822921c..cf1f7365deb3 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -679,7 +679,6 @@ struct net_bridge_mdb_entry *
 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
 struct net_bridge_mdb_entry *
 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
-void br_multicast_free_pg(struct rcu_head *head);
 struct net_bridge_port_group *
 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
                            struct net_bridge_port_group __rcu *next,
-- 
2.17.2