Re: [PATCH 1/1] Use RCU for the UDP hash lock

[Corey Minyard <minyard@xxxxxxx>]

Stephen Hemminger wrote:
>   
> >  
> >  static inline void udp_lib_unhash(struct sock *sk)
> >  {
> > -	write_lock_bh(&udp_hash_lock);
> > -	if (sk_del_node_init(sk)) {
> > +	spin_lock_bh(&udp_hash_wlock);
> > +	if (sk_del_node_rcu(sk)) {
> >  		inet_sk(sk)->num = 0;
> >  		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
> >  	}
> > -	write_unlock_bh(&udp_hash_lock);
> > +	spin_unlock_bh(&udp_hash_wlock);
> > +	synchronize_sched();
> >     
>
> Could this be synchronize_rcu? You are using rcu_read_lock() protected sections.
>   
I meant to comment on that.  I wasn't sure which to use, so I chose the 
more conservative approach.  synchronize_rcu() might be appropriate.

-corey

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