netdev - Re: [PATCH 2/3] net: dsa: b53: mmap: register MDIO Mux bus controller

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Message-ID: <20230317115115.s32r52rz3svuj4ed@skbuf>
Date:   Fri, 17 Mar 2023 13:51:15 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Álvaro Fernández Rojas <noltari@...il.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, f.fainelli@...il.com,
        jonas.gorski@...il.com, andrew@...n.ch, hkallweit1@...il.com,
        linux@...linux.org.uk, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] net: dsa: b53: mmap: register MDIO Mux bus controller

On Fri, Mar 17, 2023 at 12:34:26PM +0100, Álvaro Fernández Rojas wrote:
> b53 MMAP devices have a MDIO Mux bus controller that must be registered after
> properly initializing the switch. If the MDIO Mux controller is registered
> from a separate driver and the device has an external switch present, it will
> cause a race condition which will hang the device.

Could you describe the race in more details? Why does it hang the device?