[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>
diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c
index 91126b9..373ff70 100644
--- a/drivers/net/dummy.c
+++ b/drivers/net/dummy.c
@@ -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 @@
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 @@
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 @@
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 @@
static int __init dummy_init_module(void)
{
- struct dummy_priv *priv, *next;
int i, err = 0;
rtnl_lock();
@@ -167,11 +126,8 @@
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 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);
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index 669ee1a..c8e7c8f 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -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 @@
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 @@
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 @@
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 @@
static int __init ifb_init_module(void)
{
- struct ifb_private *priv, *next;
int i, err;
rtnl_lock();
@@ -302,11 +266,8 @@
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 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);
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index b463ba4..34c1d0b 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -115,26 +115,6 @@
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 @@
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.
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 54c17e4..7b6b163 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -270,6 +270,9 @@
*/
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 @@
* __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 @@
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);
