From: Eric Dumazet
Date: Tue, 23 Apr 2019 09:24:46 -0700
> First thing tipc_udp_recv() does is to use rcu_dereference_sk_user_data(),
> and this is really hinting we already own rcu_read_lock() from the caller
> (UDP stack).
>
> No need to add another rcu_read_lock()/rcu_read_unlock() pair.
>
>
First thing tipc_udp_recv() does is to use rcu_dereference_sk_user_data(),
and this is really hinting we already own rcu_read_lock() from the caller
(UDP stack).
No need to add another rcu_read_lock()/rcu_read_unlock() pair.
Also use rcu_dereference() instead of rcu_dereference_rtnl()
in the data
