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net: push loops and nb calls into helper functions

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Push iterations over net namespaces and netdevices from
register_netdevice_notifier() and unregister_netdevice_notifier()
into helper functions. Along with that introduce continue_reverse macros
to make the code a bit nicer allowing to get rid of "last" marks.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2019-09-30 10:15:09 +02:00
committed by David S. Miller
parent c01ebd6c46
commit afa0df5998
3 changed files with 66 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

89
net/core/dev.c
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@@ -1725,6 +1725,62 @@ static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
return nb->notifier_call(nb, val, &info);
}
static int call_netdevice_register_notifiers(struct notifier_block *nb,
struct net_device *dev)
{
int err;
err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
err = notifier_to_errno(err);
if (err)
return err;
if (!(dev->flags & IFF_UP))
return 0;
call_netdevice_notifier(nb, NETDEV_UP, dev);
return 0;
}
static void call_netdevice_unregister_notifiers(struct notifier_block *nb,
struct net_device *dev)
{
if (dev->flags & IFF_UP) {
call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
dev);
call_netdevice_notifier(nb, NETDEV_DOWN, dev);
}
call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
}
static int call_netdevice_register_net_notifiers(struct notifier_block *nb,
struct net *net)
{
struct net_device *dev;
int err;
for_each_netdev(net, dev) {
err = call_netdevice_register_notifiers(nb, dev);
if (err)
goto rollback;
}
return 0;
rollback:
for_each_netdev_continue_reverse(net, dev)
call_netdevice_unregister_notifiers(nb, dev);
return err;
}
static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb,
struct net *net)
{
struct net_device *dev;
for_each_netdev(net, dev)
call_netdevice_unregister_notifiers(nb, dev);
}
static int dev_boot_phase = 1;
/**
@@ -1743,8 +1799,6 @@ static int dev_boot_phase = 1;
int register_netdevice_notifier(struct notifier_block *nb)
{
struct net_device *dev;
struct net_device *last;
struct net *net;
int err;
@@ -1757,17 +1811,9 @@ int register_netdevice_notifier(struct notifier_block *nb)
if (dev_boot_phase)
goto unlock;
for_each_net(net) {
for_each_netdev(net, dev) {
err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
err = notifier_to_errno(err);
if (err)
goto rollback;
if (!(dev->flags & IFF_UP))
continue;
call_netdevice_notifier(nb, NETDEV_UP, dev);
}
err = call_netdevice_register_net_notifiers(nb, net);
if (err)
goto rollback;
}
unlock:
@@ -1776,22 +1822,9 @@ unlock:
return err;
rollback:
last = dev;
for_each_net(net) {
for_each_netdev(net, dev) {
if (dev == last)
goto outroll;
for_each_net_continue_reverse(net)
call_netdevice_unregister_net_notifiers(nb, net);
if (dev->flags & IFF_UP) {
call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
dev);
call_netdevice_notifier(nb, NETDEV_DOWN, dev);
}
call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
}
}
outroll:
raw_notifier_chain_unregister(&netdev_chain, nb);
goto unlock;
}