netdev - Re: [PATCH net] sctp: fix rcu usage on proc listing

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Date:	Thu, 21 Jan 2016 11:05:53 -0200
From:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:	netdev@...r.kernel.org
Cc:	Vlad Yasevich <vyasevich@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	Xin Long <lucien.xin@...il.com>, linux-sctp@...r.kernel.org
Subject: Re: [PATCH net] sctp: fix rcu usage on proc listing

On Tue, Jan 19, 2016 at 11:07:20PM -0200, Marcelo Ricardo Leitner wrote:
> On Tue, Jan 19, 2016 at 08:02:30PM -0200, Marcelo Ricardo Leitner wrote:
> > > --- a/net/sctp/proc.c
> > > +++ b/net/sctp/proc.c
> > > @@ -491,6 +491,7 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
> > >  	tsp = (struct sctp_transport *)v;
> > >  	assoc = tsp->asoc;
> > >  
> > > +	rcu_read_lock();
> 
> should have used rcu_read_lock_bh() here, will send a v2 tomorrow.

Please just drop this one, no change is actually needed.
rhashtable_walk_start() already puts the rcu_read_lock() in there and
disabling bh is not necessary. Thanks.

> > >  	list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
> > >  				transports) {
> > >  		if (tsp->dead)
> > > @@ -543,6 +544,7 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
> > >  
> > >  		seq_printf(seq, "\n");
> > >  	}
> > > +	rcu_read_unlock();
> > >  
> > >  	return 0;
> > >  }
> > > -- 
> > > 2.5.0
> > > 
> > 
> --
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