(Forgot to CC netdev@ :)
Hi,
there is wext_netdev_notifier_call()->wireless_nlevent_flush()
netdevice notifier, which takes net_rwsem, so we can't take
net_rwsem in {,un}register_netdevice_notifier().
Since {,un}register_netdevice_notifier() is executed under
pernet_ops_rwsem, net_namespace_list can't change, while we
holding it, so there is no need net_rwsem in these functions [1/2].
The same is in [2/2]. We make callers of __rtnl_link_unregister()
take pernet_ops_rwsem, and close the race with setup_net()
and cleanup_net(), so __rtnl_link_unregister() does not need it.
This also fixes the problem of that __rtnl_link_unregister() does
not see initializing and exiting nets.
Thanks,
Kirill
---
Kirill Tkhai (2):
net: Remove net_rwsem from {,un}register_netdevice_notifier()
net: Do not take net_rwsem in __rtnl_link_unregister()
drivers/net/dummy.c | 2 ++
drivers/net/ifb.c | 2 ++
net/core/dev.c | 5 -----
net/core/net_namespace.c | 1 +
net/core/rtnetlink.c | 6 +++---
5 files changed, 8 insertions(+), 8 deletions(-)
--
Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
