redonkable/remarkable-linux
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[BRIDGE]: fix error handling for add interface to bridge

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Refactor how the bridge code interacts with kobject system.
It should still use kobjects even if not using sysfs.
Fix the error unwind handling in br_add_if.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-02-09 17:10:12 -08:00 committed by David S. Miller
parent 5dce971acf
commit bab1deea30
3 changed files with 59 additions and 73 deletions
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77
net/bridge/br_if.c
View file

@ -106,6 +106,20 @@ done:
rtnl_unlock();
}
static void release_nbp(struct kobject *kobj)
{
struct net_bridge_port *p
= container_of(kobj, struct net_bridge_port, kobj);
kfree(p);
}
static struct kobj_type brport_ktype = {
#ifdef CONFIG_SYSFS
.sysfs_ops = &brport_sysfs_ops,
#endif
.release = release_nbp,
};
static void destroy_nbp(struct net_bridge_port *p)
{
struct net_device *dev = p->dev;
@ -114,7 +128,7 @@ static void destroy_nbp(struct net_bridge_port *p)
p->dev = NULL;
dev_put(dev);
br_sysfs_freeif(p);
kobject_put(&p->kobj);
}
static void destroy_nbp_rcu(struct rcu_head *head)
@ -138,6 +152,8 @@ static void del_nbp(struct net_bridge_port *p)
struct net_bridge *br = p->br;
struct net_device *dev = p->dev;
sysfs_remove_link(&br->ifobj, dev->name);
dev_set_promiscuity(dev, -1);
cancel_delayed_work(&p->carrier_check);
@ -152,6 +168,8 @@ static void del_nbp(struct net_bridge_port *p)
rcu_assign_pointer(dev->br_port, NULL);
kobject_del(&p->kobj);
call_rcu(&p->rcu, destroy_nbp_rcu);
}
@ -161,7 +179,6 @@ static void del_br(struct net_bridge *br)
struct net_bridge_port *p, *n;
list_for_each_entry_safe(p, n, &br->port_list, list) {
br_sysfs_removeif(p);
del_nbp(p);
}
@ -261,6 +278,11 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
INIT_WORK(&p->carrier_check, port_carrier_check, dev);
kobject_init(&p->kobj);
kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
p->kobj.ktype = &brport_ktype;
p->kobj.parent = &(dev->class_dev.kobj);
p->kobj.kset = NULL;
return p;
}
@ -388,31 +410,43 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
if (dev->br_port != NULL)
return -EBUSY;
if (IS_ERR(p = new_nbp(br, dev)))
p = new_nbp(br, dev);
if (IS_ERR(p))
return PTR_ERR(p);
if ((err = br_fdb_insert(br, p, dev->dev_addr)))
destroy_nbp(p);
else if ((err = br_sysfs_addif(p)))
del_nbp(p);
else {
rcu_assign_pointer(dev->br_port, p);
dev_set_promiscuity(dev, 1);
err = kobject_add(&p->kobj);
if (err)
goto err0;
list_add_rcu(&p->list, &br->port_list);
err = br_fdb_insert(br, p, dev->dev_addr);
if (err)
goto err1;
spin_lock_bh(&br->lock);
br_stp_recalculate_bridge_id(br);
br_features_recompute(br);
if ((br->dev->flags & IFF_UP)
&& (dev->flags & IFF_UP) && netif_carrier_ok(dev))
br_stp_enable_port(p);
spin_unlock_bh(&br->lock);
err = br_sysfs_addif(p);
if (err)
goto err2;
dev_set_mtu(br->dev, br_min_mtu(br));
}
rcu_assign_pointer(dev->br_port, p);
dev_set_promiscuity(dev, 1);
list_add_rcu(&p->list, &br->port_list);
spin_lock_bh(&br->lock);
br_stp_recalculate_bridge_id(br);
br_features_recompute(br);
schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE);
spin_unlock_bh(&br->lock);
dev_set_mtu(br->dev, br_min_mtu(br));
kobject_uevent(&p->kobj, KOBJ_ADD);
return 0;
err2:
br_fdb_delete_by_port(br, p);
err1:
kobject_del(&p->kobj);
err0:
kobject_put(&p->kobj);
return err;
}
@ -424,7 +458,6 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
if (!p || p->br != br)
return -EINVAL;
br_sysfs_removeif(p);
del_nbp(p);
spin_lock_bh(&br->lock);

5
net/bridge/br_private.h
View file

@ -232,9 +232,8 @@ extern void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
#ifdef CONFIG_SYSFS
/* br_sysfs_if.c */
extern struct sysfs_ops brport_sysfs_ops;
extern int br_sysfs_addif(struct net_bridge_port *p);
extern void br_sysfs_removeif(struct net_bridge_port *p);
extern void br_sysfs_freeif(struct net_bridge_port *p);
/* br_sysfs_br.c */
extern int br_sysfs_addbr(struct net_device *dev);
@ -243,8 +242,6 @@ extern void br_sysfs_delbr(struct net_device *dev);
#else
#define br_sysfs_addif(p) (0)
#define br_sysfs_removeif(p) do { } while(0)
#define br_sysfs_freeif(p) kfree(p)
#define br_sysfs_addbr(dev) (0)
#define br_sysfs_delbr(dev) do { } while(0)
#endif /* CONFIG_SYSFS */

50
net/bridge/br_sysfs_if.c
View file

@ -195,23 +195,11 @@ static ssize_t brport_store(struct kobject * kobj,
return ret;
}
/* called from kobject_put when port ref count goes to zero. */
static void brport_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct net_bridge_port, kobj));
}
static struct sysfs_ops brport_sysfs_ops = {
struct sysfs_ops brport_sysfs_ops = {
.show = brport_show,
.store = brport_store,
};
static struct kobj_type brport_ktype = {
.sysfs_ops = &brport_sysfs_ops,
.release = brport_release,
};
/*
* Add sysfs entries to ethernet device added to a bridge.
* Creates a brport subdirectory with bridge attributes.
@ -223,17 +211,6 @@ int br_sysfs_addif(struct net_bridge_port *p)
struct brport_attribute **a;
int err;
ASSERT_RTNL();
kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
p->kobj.ktype = &brport_ktype;
p->kobj.parent = &(p->dev->class_dev.kobj);
p->kobj.kset = NULL;
err = kobject_add(&p->kobj);
if(err)
goto out1;
err = sysfs_create_link(&p->kobj, &br->dev->class_dev.kobj,
SYSFS_BRIDGE_PORT_LINK);
if (err)
@ -245,28 +222,7 @@ int br_sysfs_addif(struct net_bridge_port *p)
goto out2;
}
err = sysfs_create_link(&br->ifobj, &p->kobj, p->dev->name);
if (err)
goto out2;
kobject_uevent(&p->kobj, KOBJ_ADD);
return 0;
out2:
kobject_del(&p->kobj);
out1:
err= sysfs_create_link(&br->ifobj, &p->kobj, p->dev->name);
out2:
return err;
}
void br_sysfs_removeif(struct net_bridge_port *p)
{
pr_debug("br_sysfs_removeif\n");
sysfs_remove_link(&p->br->ifobj, p->dev->name);
kobject_uevent(&p->kobj, KOBJ_REMOVE);
kobject_del(&p->kobj);
}
void br_sysfs_freeif(struct net_bridge_port *p)
{
pr_debug("br_sysfs_freeif\n");
kobject_put(&p->kobj);
}