linux-kernel - Re: [RFC PATCH v1 8/9] net: ipconfig: Force fw_devlink to unblock any devices that might probe

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Date:   Tue, 7 Jun 2022 14:36:28 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        John Stultz <jstultz@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [RFC PATCH v1 8/9] net: ipconfig: Force fw_devlink to unblock any
 devices that might probe

Hi Saravana,

On Thu, May 26, 2022 at 10:16 AM Saravana Kannan <saravanak@...gle.com> wrote:
> If there are network devices that could probe without some of their
> suppliers probing and those network devices are needed for IP auto
> config to work, then fw_devlink=on might break that usecase by blocking
> the network devices from probing by the time IP auto config starts.
>
> So, when IP auto config is enabled, make sure fw_devlink doesn't block
> the probing of any device that has a driver by the time we get to IP
> auto config.
>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> ---
>  net/ipv4/ipconfig.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
> index 9d41d5d5cd1e..aa7b8ba68ca6 100644
> --- a/net/ipv4/ipconfig.c
> +++ b/net/ipv4/ipconfig.c
> @@ -1435,6 +1435,8 @@ static int __init wait_for_devices(void)
>  {
>         int i;
>
> +       fw_devlink_unblock_may_probe();
> +
>         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
>                 struct net_device *dev;
>                 int found = 0;

FTR, this lacks an include <linux/fwnode.h>, as my mips rbtx4927
build fails with:

net/ipv4/ipconfig.c:1438:2: error: implicit declaration of function
‘fw_devlink_unblock_may_probe’ [-Werror=implicit-function-declaration]

Switching to v2 instead...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds