From f8ae737deea1be001d7d8ac11c382a7b73a1c98f Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Mon, 20 Mar 2006 22:58:36 -0800 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- net/bridge/br_device.c | 3 +-- net/bridge/br_fdb.c | 6 ++---- 2 files changed, 3 insertions(+), 6 deletions(-) diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c index 0b33a7b3a00c..0c88a2ac32c1 100644 --- 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 1f08a59b51ea..3a73b8c94271 100644 --- 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(); } -- 2.30.2