netdev - Re: [RFC PATCH v2 net-next 6/7] net: ethtool: add a mutex protecting RSS contexts

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Date:   Tue, 11 Apr 2023 22:40:19 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     edward.cree@....com
Cc:     linux-net-drivers@....com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, edumazet@...gle.com,
        Edward Cree <ecree.xilinx@...il.com>, netdev@...r.kernel.org,
        habetsm.xilinx@...il.com, sudheer.mogilappagari@...el.com
Subject: Re: [RFC PATCH v2 net-next 6/7] net: ethtool: add a mutex protecting
 RSS contexts

On Tue, Apr 11, 2023 at 07:26:14PM +0100, edward.cree@....com wrote:
> From: Edward Cree <ecree.xilinx@...il.com>
> 
> While this is not needed to serialise the ethtool entry points (which
>  are all under RTNL), drivers may have cause to asynchronously access
>  dev->ethtool->rss_ctx; taking dev->ethtool->rss_lock allows them to
>  do this safely without needing to take the RTNL.

What is actually wrong with taking RTNL? KISS is often best,
especially for locks.

     Andrew