netdev - Re: [PATCH net] net: dsa: mv88e6xxx: avoid reg_lock deadlock in mv88e6xxx_setup

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Date:   Thu, 15 Dec 2022 15:00:16 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, andrew@...n.ch, f.fainelli@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mw@...ihalf.com, bigunclemax@...il.com,
        fido_max@...ox.ru, linux@...linux.org.uk, kabel@...nel.org
Subject: Re: [PATCH net] net: dsa: mv88e6xxx: avoid reg_lock deadlock in
 mv88e6xxx_setup_port()

Hello:

This patch was applied to netdev/net.git (master)
by Paolo Abeni <pabeni@...hat.com>:

On Wed, 14 Dec 2022 13:01:20 +0200 you wrote:
> In the blamed commit, it was not noticed that one implementation of
> chip->info->ops->phylink_get_caps(), called by mv88e6xxx_get_caps(),
> may access hardware registers, and in doing so, it takes the
> mv88e6xxx_reg_lock(). Namely, this is mv88e6352_phylink_get_caps().
> 
> This is a problem because mv88e6xxx_get_caps(), apart from being
> a top-level function (method invoked by dsa_switch_ops), is now also
> directly called from mv88e6xxx_setup_port(), which runs under the
> mv88e6xxx_reg_lock() taken by mv88e6xxx_setup(). Therefore, when running
> on mv88e6352, the reg_lock would be acquired a second time and the
> system would deadlock on driver probe.
> 
> [...]

Here is the summary with links:
  - [net] net: dsa: mv88e6xxx: avoid reg_lock deadlock in mv88e6xxx_setup_port()
    https://git.kernel.org/netdev/net/c/a7d82367daa6

You are awesome, thank you!
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