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[RTNETLINK]: rtnl_link API simplification 

All drivers need to unregister their devices in the module unload function.
While doing so they must hold the rtnl and atomically unregister the
rtnl_link ops as well. This makes the rtnl_link_unregister function that
takes the rtnl itself completely useless.

Provide default newlink/dellink functions, make __rtnl_link_unregister and
rtnl_link_unregister unregister all devices with matching rtnl_link_ops and
change the existing users to take advantage of that.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-07-11 19:42:13 -07:00 committed by David S. Miller
parent 8c979c26a0
commit 2d85cba2b2
4 changed files with 23 additions and 131 deletions
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57
drivers/net/dummy.c
View File

@ -37,11 +37,6 @@
#include <linux/rtnetlink.h>
#include <net/rtnetlink.h>
struct dummy_priv {
struct net_device *dev;
struct list_head list;
};
static int numdummies = 1;
static int dummy_xmit(struct sk_buff *skb, struct net_device *dev);
@ -89,37 +84,9 @@ static int dummy_xmit(struct sk_buff *skb, struct net_device *dev)
return 0;
}
static LIST_HEAD(dummies);
static int dummy_newlink(struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct dummy_priv *priv = netdev_priv(dev);
int err;
err = register_netdevice(dev);
if (err < 0)
return err;
priv->dev = dev;
list_add_tail(&priv->list, &dummies);
return 0;
}
static void dummy_dellink(struct net_device *dev)
{
struct dummy_priv *priv = netdev_priv(dev);
list_del(&priv->list);
unregister_netdevice(dev);
}
static struct rtnl_link_ops dummy_link_ops __read_mostly = {
.kind = "dummy",
.priv_size = sizeof(struct dummy_priv),
.setup = dummy_setup,
.newlink = dummy_newlink,
.dellink = dummy_dellink,
};
/* Number of dummy devices to be set up by this module. */
@ -129,12 +96,9 @@ MODULE_PARM_DESC(numdummies, "Number of dummy pseudo devices");
static int __init dummy_init_one(void)
{
struct net_device *dev_dummy;
struct dummy_priv *priv;
int err;
dev_dummy = alloc_netdev(sizeof(struct dummy_priv), "dummy%d",
dummy_setup);
dev_dummy = alloc_netdev(0, "dummy%d", dummy_setup);
if (!dev_dummy)
return -ENOMEM;
@ -146,10 +110,6 @@ static int __init dummy_init_one(void)
err = register_netdevice(dev_dummy);
if (err < 0)
goto err;
priv = netdev_priv(dev_dummy);
priv->dev = dev_dummy;
list_add_tail(&priv->list, &dummies);
return 0;
err:
@ -159,7 +119,6 @@ err:
static int __init dummy_init_module(void)
{
struct dummy_priv *priv, *next;
int i, err = 0;
rtnl_lock();
@ -167,11 +126,8 @@ static int __init dummy_init_module(void)
for (i = 0; i < numdummies && !err; i++)
err = dummy_init_one();
if (err < 0) {
list_for_each_entry_safe(priv, next, &dummies, list)
dummy_dellink(priv->dev);
if (err < 0)
__rtnl_link_unregister(&dummy_link_ops);
}
rtnl_unlock();
return err;
@ -179,14 +135,7 @@ static int __init dummy_init_module(void)
static void __exit dummy_cleanup_module(void)
{
struct dummy_priv *priv, *next;
rtnl_lock();
list_for_each_entry_safe(priv, next, &dummies, list)
dummy_dellink(priv->dev);
__rtnl_link_unregister(&dummy_link_ops);
rtnl_unlock();
rtnl_link_unregister(&dummy_link_ops);
}
module_init(dummy_init_module);

58
drivers/net/ifb.c
View File

@ -33,15 +33,12 @@
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/list.h>
#include <net/pkt_sched.h>
#define TX_TIMEOUT (2*HZ)
#define TX_Q_LIMIT 32
struct ifb_private {
struct list_head list;
struct net_device *dev;
struct net_device_stats stats;
struct tasklet_struct ifb_tasklet;
int tasklet_pending;
@ -201,12 +198,6 @@ static struct net_device_stats *ifb_get_stats(struct net_device *dev)
return stats;
}
static LIST_HEAD(ifbs);
/* Number of ifb devices to be set up by this module. */
module_param(numifbs, int, 0);
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
static int ifb_close(struct net_device *dev)
{
struct ifb_private *dp = netdev_priv(dev);
@ -230,41 +221,19 @@ static int ifb_open(struct net_device *dev)
return 0;
}
static int ifb_newlink(struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct ifb_private *priv = netdev_priv(dev);
int err;
err = register_netdevice(dev);
if (err < 0)
return err;
priv->dev = dev;
list_add_tail(&priv->list, &ifbs);
return 0;
}
static void ifb_dellink(struct net_device *dev)
{
struct ifb_private *priv = netdev_priv(dev);
list_del(&priv->list);
unregister_netdevice(dev);
}
static struct rtnl_link_ops ifb_link_ops __read_mostly = {
.kind = "ifb",
.priv_size = sizeof(struct ifb_private),
.setup = ifb_setup,
.newlink = ifb_newlink,
.dellink = ifb_dellink,
};
/* Number of ifb devices to be set up by this module. */
module_param(numifbs, int, 0);
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
static int __init ifb_init_one(int index)
{
struct net_device *dev_ifb;
struct ifb_private *priv;
int err;
dev_ifb = alloc_netdev(sizeof(struct ifb_private),
@ -281,10 +250,6 @@ static int __init ifb_init_one(int index)
err = register_netdevice(dev_ifb);
if (err < 0)
goto err;
priv = netdev_priv(dev_ifb);
priv->dev = dev_ifb;
list_add_tail(&priv->list, &ifbs);
return 0;
err:
@ -294,7 +259,6 @@ err:
static int __init ifb_init_module(void)
{
struct ifb_private *priv, *next;
int i, err;
rtnl_lock();
@ -302,11 +266,8 @@ static int __init ifb_init_module(void)
for (i = 0; i < numifbs && !err; i++)
err = ifb_init_one(i);
if (err) {
list_for_each_entry_safe(priv, next, &ifbs, list)
ifb_dellink(priv->dev);
if (err)
__rtnl_link_unregister(&ifb_link_ops);
}
rtnl_unlock();
return err;
@ -314,14 +275,7 @@ static int __init ifb_init_module(void)
static void __exit ifb_cleanup_module(void)
{
struct ifb_private *priv, *next;
rtnl_lock();
list_for_each_entry_safe(priv, next, &ifbs, list)
ifb_dellink(priv->dev);
__rtnl_link_unregister(&ifb_link_ops);
rtnl_unlock();
rtnl_link_unregister(&ifb_link_ops);
}
module_init(ifb_init_module);

21
net/8021q/vlan.c
View File

@ -115,26 +115,6 @@ err1:
return err;
}
/* Cleanup all vlan devices
* Note: devices that have been registered that but not
* brought up will exist but have no module ref count.
*/
static void __exit vlan_cleanup_devices(void)
{
struct net_device *dev, *nxt;
rtnl_lock();
for_each_netdev_safe(dev, nxt) {
if (dev->priv_flags & IFF_802_1Q_VLAN) {
unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
VLAN_DEV_INFO(dev)->vlan_id);
unregister_netdevice(dev);
}
}
rtnl_unlock();
}
/*
* Module 'remove' entry point.
* o delete /proc/net/router directory and static entries.
@ -150,7 +130,6 @@ static void __exit vlan_cleanup_module(void)
unregister_netdevice_notifier(&vlan_notifier_block);
dev_remove_pack(&vlan_packet_type);
vlan_cleanup_devices();
/* This table must be empty if there are no module
* references left.

18
net/core/rtnetlink.c
View File

@ -270,6 +270,9 @@ static LIST_HEAD(link_ops);
*/
int __rtnl_link_register(struct rtnl_link_ops *ops)
{
if (!ops->dellink)
ops->dellink = unregister_netdevice;
list_add_tail(&ops->list, &link_ops);
return 0;
}
@ -298,12 +301,16 @@ EXPORT_SYMBOL_GPL(rtnl_link_register);
* __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
* @ops: struct rtnl_link_ops * to unregister
*
* The caller must hold the rtnl_mutex. This function should be used
* by drivers that unregister devices during module unloading. It must
* be called after unregistering the devices.
* The caller must hold the rtnl_mutex.
*/
void __rtnl_link_unregister(struct rtnl_link_ops *ops)
{
struct net_device *dev, *n;
for_each_netdev_safe(dev, n) {
if (dev->rtnl_link_ops == ops)
ops->dellink(dev);
}
list_del(&ops->list);
}
@ -1067,7 +1074,10 @@ replay:
if (tb[IFLA_LINKMODE])
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
err = ops->newlink(dev, tb, data);
if (ops->newlink)
err = ops->newlink(dev, tb, data);
else
err = register_netdevice(dev);
err_free:
if (err < 0)
free_netdev(dev);