[BRIDGE]: forwarding remove unneeded preempt and bh diasables

Optimize the forwarding and transmit paths. Both places are
called with bottom half/no preempt so there is no need to use
spin_lock_bh or rcu_read_lock.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 0b33a7b..0c88a2a 100644 (file)
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -27,6 +27,7 @@ static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
        return &br->statistics;
 }
 
+/* net device transmit always called with no BH (preempt_disabled) */
 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 {
        struct net_bridge *br = netdev_priv(dev);
@@ -39,7 +40,6 @@ int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
        skb->mac.raw = skb->data;
        skb_pull(skb, ETH_HLEN);
 
-       rcu_read_lock();
        if (dest[0] & 1) 
                br_flood_deliver(br, skb, 0);
        else if ((dst = __br_fdb_get(br, dest)) != NULL)
@@ -47,7 +47,6 @@ int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
        else
                br_flood_deliver(br, skb, 0);
 
-       rcu_read_unlock();
        return 0;
 }
 

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 1f08a59..3a73b8c 100644 (file)
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -341,7 +341,6 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
        if (hold_time(br) == 0)
                return;
 
-       rcu_read_lock();
        fdb = fdb_find(head, addr);
        if (likely(fdb)) {
                /* attempt to update an entry for a local interface */
@@ -356,13 +355,12 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
                        fdb->ageing_timer = jiffies;
                }
        } else {
-               spin_lock_bh(&br->hash_lock);
+               spin_lock(&br->hash_lock);
                if (!fdb_find(head, addr))
                        fdb_create(head, source, addr, 0);
                /* else  we lose race and someone else inserts
                 * it first, don't bother updating
                 */
-               spin_unlock_bh(&br->hash_lock);
+               spin_unlock(&br->hash_lock);
        }
-       rcu_read_unlock();
 }