linux-kernel - Re: [RFC PATCH net 2/5] net: dsa: be compatible with masters which unregister on shutdown

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Date:   Sun, 12 Sep 2021 16:18:37 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        George McCollister <george.mccollister@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Lino Sanfilippo <LinoSanfilippo@....de>
Subject: Re: [RFC PATCH net 2/5] net: dsa: be compatible with masters which
 unregister on shutdown

On Sun, Sep 12, 2021 at 03:09:29PM +0300, Vladimir Oltean wrote:
> +static int b53_mmap_shutdown(struct platform_device *pdev)
> +{
> +	struct b53_device *dev = platform_get_drvdata(pdev);
> +
> +	if (dev)
> +		b53_switch_shutdown(dev);
> +
> +	platform_set_drvdata(pdev, NULL);
> +}
> +
>  static const struct of_device_id b53_mmap_of_table[] = {
>  	{ .compatible = "brcm,bcm3384-switch" },
>  	{ .compatible = "brcm,bcm6328-switch" },
> @@ -331,6 +343,7 @@ MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
>  static struct platform_driver b53_mmap_driver = {
>  	.probe = b53_mmap_probe,
>  	.remove = b53_mmap_remove,
> +	.shutdown = b53_mmap_shutdown,
>  	.driver = {
>  		.name = "b53-switch",
>  		.of_match_table = b53_mmap_of_table,

I forgot to enable all variants of the b53 driver, and as such, the mmap
version fails to build (the shutdown function should return void, not int).

I will fix this when I send the v2 patch, but I will not send that now,
as I would like to get some feedback on the approach first.