From 269def7c505b4d229f9ad49bf88543d1e605533e Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 22 Feb 2007 01:10:18 -0800 Subject: [PATCH] [BRIDGE]: eliminate workqueue for carrier check Having a work queue for checking carrier leads to lots of race issues. Simpler to just get the cost when data structure is created and update on change. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/bridge/br_if.c | 30 +++++------------------------- net/bridge/br_notify.c | 25 +++++++++++-------------- net/bridge/br_private.h | 4 +--- 3 files changed, 17 insertions(+), 42 deletions(-) diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c index aff6a779c9c8..6845a258408f 100644 --- a/net/bridge/br_if.c +++ b/net/bridge/br_if.c @@ -77,26 +77,15 @@ static int port_cost(struct net_device *dev) * Called from work queue to allow for calling functions that * might sleep (such as speed check), and to debounce. */ -static void port_carrier_check(struct work_struct *work) +void br_port_carrier_check(struct net_bridge_port *p) { - struct net_bridge_port *p; - struct net_device *dev; - struct net_bridge *br; - - dev = container_of(work, struct net_bridge_port, - carrier_check.work)->dev; - work_release(work); - - rtnl_lock(); - p = dev->br_port; - if (!p) - goto done; - br = p->br; + struct net_device *dev = p->dev; + struct net_bridge *br = p->br; if (netif_carrier_ok(dev)) p->path_cost = port_cost(dev); - if (br->dev->flags & IFF_UP) { + if (netif_running(br->dev)) { spin_lock_bh(&br->lock); if (netif_carrier_ok(dev)) { if (p->state == BR_STATE_DISABLED) @@ -107,9 +96,6 @@ static void port_carrier_check(struct work_struct *work) } spin_unlock_bh(&br->lock); } -done: - dev_put(dev); - rtnl_unlock(); } static void release_nbp(struct kobject *kobj) @@ -162,9 +148,6 @@ static void del_nbp(struct net_bridge_port *p) dev_set_promiscuity(dev, -1); - if (cancel_delayed_work(&p->carrier_check)) - dev_put(dev); - spin_lock_bh(&br->lock); br_stp_disable_port(p); spin_unlock_bh(&br->lock); @@ -282,7 +265,6 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br, p->port_no = index; br_init_port(p); p->state = BR_STATE_DISABLED; - INIT_DELAYED_WORK_NAR(&p->carrier_check, port_carrier_check); br_stp_port_timer_init(p); kobject_init(&p->kobj); @@ -446,12 +428,10 @@ int br_add_if(struct net_bridge *br, struct net_device *dev) spin_lock_bh(&br->lock); br_stp_recalculate_bridge_id(br); br_features_recompute(br); - if (schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE)) - dev_hold(dev); - spin_unlock_bh(&br->lock); dev_set_mtu(br->dev, br_min_mtu(br)); + kobject_uevent(&p->kobj, KOBJ_ADD); return 0; diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c index 3311c4e30829..37357ed2149b 100644 --- a/net/bridge/br_notify.c +++ b/net/bridge/br_notify.c @@ -42,51 +42,48 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v br = p->br; - spin_lock_bh(&br->lock); switch (event) { case NETDEV_CHANGEMTU: dev_set_mtu(br->dev, br_min_mtu(br)); break; case NETDEV_CHANGEADDR: + spin_lock_bh(&br->lock); br_fdb_changeaddr(p, dev->dev_addr); br_ifinfo_notify(RTM_NEWLINK, p); br_stp_recalculate_bridge_id(br); + spin_unlock_bh(&br->lock); break; case NETDEV_CHANGE: - if (br->dev->flags & IFF_UP) - if (schedule_delayed_work(&p->carrier_check, - BR_PORT_DEBOUNCE)) - dev_hold(dev); + br_port_carrier_check(p); break; case NETDEV_FEAT_CHANGE: - if (br->dev->flags & IFF_UP) + spin_lock_bh(&br->lock); + if (netif_running(br->dev)) br_features_recompute(br); - - /* could do recursive feature change notification - * but who would care?? - */ + spin_unlock_bh(&br->lock); break; case NETDEV_DOWN: + spin_lock_bh(&br->lock); if (br->dev->flags & IFF_UP) br_stp_disable_port(p); + spin_unlock_bh(&br->lock); break; case NETDEV_UP: + spin_lock_bh(&br->lock); if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) br_stp_enable_port(p); + spin_unlock_bh(&br->lock); break; case NETDEV_UNREGISTER: - spin_unlock_bh(&br->lock); br_del_if(br, dev); - goto done; + break; } - spin_unlock_bh(&br->lock); - done: return NOTIFY_DONE; } diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 16fc47a821e5..cc3f1c99261a 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -26,8 +26,6 @@ #define BR_PORT_BITS 10 #define BR_MAX_PORTS (1<