[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/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);