linux-kernel - Re: [net-next: PATCH v3 6/8] net: core: switch to fwnode_find_net_device_by

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Message-ID: <20220728091643.m6c5d36pseenrw6l@skbuf>
Date:   Thu, 28 Jul 2022 12:16:43 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>,
        Grzegorz Jaszczyk <jaz@...ihalf.com>,
        Tomasz Nowicki <tn@...ihalf.com>,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@....com>,
        "upstream@...ihalf.com" <upstream@...ihalf.com>
Subject: Re: [net-next: PATCH v3 6/8] net: core: switch to
 fwnode_find_net_device_by_node()

On Thu, Jul 28, 2022 at 08:52:04AM +0200, Marcin Wojtas wrote:
> Yes, indeed. After recent update, I think we can assume the current
> implementation of fwnode_find_parent_dev_match should work fine with
> all existing cases.

What you should really be fixing is the commit message of patch 4,
that's what threw me off:

| As a preparation to switch the DSA subsystem from using
| of_find_net_device_by_node() to its more generic fwnode_
| equivalent, the port's device structure should be updated
| with its fwnode pointer, similarly to of_node - see analogous
| commit c4053ef32208 ("net: mvpp2: initialize port of_node pointer").
| 
| This patch is required to prevent a regression before updating
| the DSA API on boards that connect the mvpp2 port to switch,
| such as Clearfog GT-8K or CN913x CEx7 Evaluation Board.

There's no regression to speak of. DSA didn't work with ACPI before, and
fwnode_find_net_device_by_node() still works with the plain dev->of_node
assignment.