linux-kernel - Re: [PATCH v2 04/11] gpiolib: Clear the gpio_device's fwnode initialized flag before adding

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Message-ID: <CAGETcx9aPp+JU-hO+fGyGps6jaoKoFzZd2zzy5YZBKoU8G=OhA@mail.gmail.com>
Date:   Mon, 30 Jan 2023 20:01:17 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Cristian Marussi <cristian.marussi@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
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        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
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        Linux Kernel Functional Testing <lkft@...aro.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
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        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 04/11] gpiolib: Clear the gpio_device's fwnode
 initialized flag before adding

On Mon, Jan 30, 2023 at 7:14 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Mon, Jan 30, 2023 at 02:31:53PM +0000, Sudeep Holla wrote:
> > On Thu, Jan 26, 2023 at 04:11:31PM -0800, Saravana Kannan wrote:
> > > Registering an irqdomain sets the flag for the fwnode. But having the
> > > flag set when a device is added is interpreted by fw_devlink to mean the
> > > device has already been initialized and will never probe. This prevents
> > > fw_devlink from creating device links with the gpio_device as a
> > > supplier. So, clear the flag before adding the device.
>
> ...
>
> > > +   /*
> > > +    * If fwnode doesn't belong to another device, it's safe to clear its
> > > +    * initialized flag.
> > > +    */
> > > +   if (!gdev->dev.fwnode->dev)
> > > +           fwnode_dev_initialized(gdev->dev.fwnode, false);
> >
> > This is the one causing the kernel crash during the boot on FVP which
> > Naresh has reported. Just reverted this and was able to boot, confirming
> > the issue with this patch.
>
> I'm wondering if
>
>         if (!dev_fwnode(&gdev->dev)->dev)
>                 fwnode_dev_initialized(&dev_fwnode(gdev->dev), false);
>
> works.

No, that won't help. The problem was that with arm32, we have gpio
devices created without any of_node or fwnode. So I can't assume
fwnode will always be present.

-Saravana