bridge: Replace mp->mglist hlist with a bool

As it turns out we never need to walk through the list of multicast
groups subscribed by the bridge interface itself (the only time we'd
want to do that is when we shut down the bridge, in which case we
simply walk through all multicast groups), we don't really need to
keep an hlist for mp->mglist.

This means that we can replace it with just a single bit to indicate
whether the bridge interface is subscribed to a group.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 9 insertions, 12 deletions

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 6f6d8e1b776f..88e4aa9cb1f9 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -80,7 +80,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
         if (is_multicast_ether_addr(dest)) {
                 mdst = br_mdb_get(br, skb);
                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) {
-                        if ((mdst && !hlist_unhashed(&mdst->mglist)) ||
+                        if ((mdst && mdst->mglist) ||
                             br_multicast_is_router(br))
                                 skb2 = skb;
                         br_multicast_forward(mdst, skb, skb2);
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index c558274051eb..09d5c0987925 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -232,8 +232,7 @@ static void br_multicast_group_expired(unsigned long data)
         if (!netif_running(br->dev) || timer_pending(&mp->timer))
                 goto out;
 
-        if (!hlist_unhashed(&mp->mglist))
-                hlist_del_init(&mp->mglist);
+        mp->mglist = false;
 
         if (mp->ports)
                 goto out;
@@ -276,7 +275,7 @@ static void br_multicast_del_pg(struct net_bridge *br,
                 del_timer(&p->query_timer);
                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 
-                if (!mp->ports && hlist_unhashed(&mp->mglist) &&
+                if (!mp->ports && !mp->mglist &&
                     netif_running(br->dev))
                         mod_timer(&mp->timer, jiffies);
 
@@ -528,7 +527,7 @@ static void br_multicast_group_query_expired(unsigned long data)
         struct net_bridge *br = mp->br;
 
         spin_lock(&br->multicast_lock);
-        if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
+        if (!netif_running(br->dev) || !mp->mglist ||
             mp->queries_sent >= br->multicast_last_member_count)
                 goto out;
 
@@ -719,8 +718,7 @@ static int br_multicast_add_group(struct net_bridge *br,
                 goto err;
 
         if (!port) {
-                if (hlist_unhashed(&mp->mglist))
-                        hlist_add_head(&mp->mglist, &br->mglist);
+                mp->mglist = true;
                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
                 goto out;
         }
@@ -1166,7 +1164,7 @@ static int br_ip4_multicast_query(struct net_bridge *br,
 
         max_delay *= br->multicast_last_member_count;
 
-        if (!hlist_unhashed(&mp->mglist) &&
+        if (mp->mglist &&
             (timer_pending(&mp->timer) ?
              time_after(mp->timer.expires, now + max_delay) :
              try_to_del_timer_sync(&mp->timer) >= 0))
@@ -1237,7 +1235,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
                 goto out;
 
         max_delay *= br->multicast_last_member_count;
-        if (!hlist_unhashed(&mp->mglist) &&
+        if (mp->mglist &&
             (timer_pending(&mp->timer) ?
              time_after(mp->timer.expires, now + max_delay) :
              try_to_del_timer_sync(&mp->timer) >= 0))
@@ -1284,7 +1282,7 @@ static void br_multicast_leave_group(struct net_bridge *br,
                      br->multicast_last_member_interval;
 
         if (!port) {
-                if (!hlist_unhashed(&mp->mglist) &&
+                if (mp->mglist &&
                     (timer_pending(&mp->timer) ?
                      time_after(mp->timer.expires, time) :
                      try_to_del_timer_sync(&mp->timer) >= 0)) {
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 84aac7734bfc..4e1b620b6be6 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -84,13 +84,13 @@ struct net_bridge_port_group {
 struct net_bridge_mdb_entry
 {
         struct hlist_node               hlist[2];
-        struct hlist_node               mglist;
         struct net_bridge               *br;
         struct net_bridge_port_group __rcu *ports;
         struct rcu_head                 rcu;
         struct timer_list               timer;
         struct timer_list               query_timer;
         struct br_ip                    addr;
+        bool                            mglist;
         u32                             queries_sent;
 };
 
@@ -238,7 +238,6 @@ struct net_bridge
         spinlock_t                      multicast_lock;
         struct net_bridge_mdb_htable __rcu *mdb;
         struct hlist_head               router_list;
-        struct hlist_head               mglist;
 
         struct timer_list               multicast_router_timer;
         struct timer_list               multicast_querier_timer;