mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
net: Convert loopback_net_ops
These pernet_operations have only init() method. It allocates memory for net_device, calls register_netdev() and assigns net::loopback_dev. register_netdev() is allowed be used without additional locks, as it's synchronized on rtnl_lock(). There are many examples of using this functon directly from ioctl(). The only difference, compared to ioctl(), is that net is not completely alive at this moment. But it looks like, there is no way for parallel pernet_operations to dereference the net_device, as the most of struct net_device lists, where it's linked, are related to net, and the net is not liked. The exceptions are net_device::unreg_list, close_list, todo_list, used for unregistration, and ::link_watch_list, where net_device may be linked to global lists. Unregistration of loopback_dev obviously can't happen, when loopback_net_init() is executing, as the net as alive. It occurs in default_device_ops, which currently requires net_mutex, and it behaves as a barrier at the moment. It will be considered in next patch. Speaking about link_watch_list, it seems, there is no way for loopback_dev at time of registration to be linked in lweventlist and be available for another pernet_operations. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Acked-by: Andrei Vagin <avagin@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
0bc9be6718
commit
9a4d105de7
1 changed files with 1 additions and 0 deletions
|
@ -230,4 +230,5 @@ static __net_init int loopback_net_init(struct net *net)
|
|||
/* Registered in net/core/dev.c */
|
||||
struct pernet_operations __net_initdata loopback_net_ops = {
|
||||
.init = loopback_net_init,
|
||||
.async = true,
|
||||
};
|
||||
|
|
Loading…
Reference in a new issue