netdev - Re: [PATCH net v4] smsc911x: only update stats when interface is up

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Message-ID: <20230330235009.4b6d4b8e@kernel.org>
Date:   Thu, 30 Mar 2023 23:50:09 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Steve Glendinning <steve.glendinning@...well.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v4] smsc911x: only update stats when interface is up

On Fri, 31 Mar 2023 08:33:24 +0200 Wolfram Sang wrote:
> > Okay, core changes aside - does pm_runtime_put() imply an RCU sync?
> > Otherwise your check in get_stats is racy...  
> 
> From some light research, I can't find a trace of RCU sync. Pity, I'll
> need to move furhter investigation to later. I'll report back if I have
> something, but it may take a while. Thanks for the help!

If you don't want to spend too much time you can just call it yourself
right? :) Put a synchronize_rcu() with a comment about concurrent stat
reading after pdata->is_open = false; and that's it?