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[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 <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-02-22 01:10:18 -08:00 committed by David S. Miller
parent ac062e84d0
commit 269def7c50
3 changed files with 17 additions and 42 deletions
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30
net/bridge/br_if.c
View File

@ -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;

25
net/bridge/br_notify.c
View File

@ -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;
}

4
net/bridge/br_private.h
View File

@ -26,8 +26,6 @@
#define BR_PORT_BITS 10
#define BR_MAX_PORTS (1<<BR_PORT_BITS)
#define BR_PORT_DEBOUNCE (HZ/10)
#define BR_VERSION "2.2"
typedef struct bridge_id bridge_id;
@ -81,7 +79,6 @@ struct net_bridge_port
struct timer_list hold_timer;
struct timer_list message_age_timer;
struct kobject kobj;
struct delayed_work carrier_check;
struct rcu_head rcu;
};
@ -172,6 +169,7 @@ extern void br_flood_forward(struct net_bridge *br,
int clone);
/* br_if.c */
extern void br_port_carrier_check(struct net_bridge_port *p);
extern int br_add_bridge(const char *name);
extern int br_del_bridge(const char *name);
extern void br_cleanup_bridges(void);