netdev - Re: [PATCH v1 3/3] net: mdio-mux: Handle -EPROBE

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Date:   Sat, 7 Aug 2021 17:49:24 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>, kernel-team@...roid.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] net: mdio-mux: Handle -EPROBE_DEFER correctly

On Wed, Aug 04, 2021 at 02:43:32PM -0700, Saravana Kannan wrote:
> When registering mdiobus children, if we get an -EPROBE_DEFER, we shouldn't
> ignore it and continue registering the rest of the mdiobus children. This
> would permanently prevent the deferring child mdiobus from working instead
> of reattempting it in the future. So, if a child mdiobus needs to be
> reattempted in the future, defer the entire mdio-mux initialization.
> 
> This fixes the issue where PHYs sitting under the mdio-mux aren't
> initialized correctly if the PHY's interrupt controller is not yet ready
> when the mdio-mux is being probed. Additional context in the link below.
> 
> Link: https://lore.kernel.org/lkml/CAGETcx95kHrv8wA-O+-JtfH7H9biJEGJtijuPVN0V5dUKUAB3A@mail.gmail.com/#t
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew