Re: [Patch net-next] audit: remove useless synchronize_net()
On Wed, Nov 30, 2016 at 1:16 AM, Richard Guy Briggs <rgb(a)redhat.com> wrote:
On 2016-11-29 09:14, Cong Wang wrote:
> netlink kernel socket is protected by refcount, not RCU.
> Its rcv path is neither protected by RCU. So the synchronize_net()
> is just pointless.
If I understand correctly, xfrm_user_net_exit() usage of
RCU_INIT_POINTER() and synchronize_net() is similarly pointless? Also
net/phonet/socket.c? I probably modelled things based on the former...
Possibly, but xfrm case is slightly different, it has two copies of the pointer
to the netlink socket, also it uses exit_batch(). I need to double check.
Take a look at better examples, fib_front, genetlink, rtnetlink.