linux-kernel - Re: [PATCH v6 net-next 5/5] net: mscc: ocelot: use bulk reads for stats

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Message-ID: <20220210152712.jchztf34gf3pgsyf@skbuf>
Date:   Thu, 10 Feb 2022 15:27:13 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Colin Foster <colin.foster@...advantage.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>
Subject: Re: [PATCH v6 net-next 5/5] net: mscc: ocelot: use bulk reads for
 stats

On Thu, Feb 10, 2022 at 07:21:03AM -0800, Colin Foster wrote:
> > ocelot_check_stats_work() should also check for errors.
> 
> Another change I'm catching: I assume calling dev_err while holding a
> mutex is frowned upon, so I'm moving this err check after the counter
> copy / mutex unlock. I'll submit that fix after patch 1 gets merged into
> net / mainline.

Where did you read that? Doing work that doesn't need to be under a lock
while that work is held isn't preferable, of course, but what is special
about dev_err?