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References: <20230127001141.407071-1-saravanak@google.com> <20230127001141.407071-5-saravanak@google.com>
 <20230130143153.67dsxn4lugfetfwb@bogus> <Y9fe2arI8afeURWn@smile.fi.intel.com>
In-Reply-To: <Y9fe2arI8afeURWn@smile.fi.intel.com>
From:   Saravana Kannan <saravanak@google.com>
Date:   Mon, 30 Jan 2023 20:01:17 -0800
Message-ID: <CAGETcx9aPp+JU-hO+fGyGps6jaoKoFzZd2zzy5YZBKoU8G=OhA@mail.gmail.com>
Subject: Re: [PATCH v2 04/11] gpiolib: Clear the gpio_device's fwnode
 initialized flag before adding
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc:     Sudeep Holla <sudeep.holla@arm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Cristian Marussi <cristian.marussi@arm.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <maz@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Magnus Damm <magnus.damm@gmail.com>,
        Len Brown <lenb@kernel.org>,
        Daniel Scally <djrscally@gmail.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Tony Lindgren <tony@atomide.com>,
        Linux Kernel Functional Testing <lkft@linaro.org>,
        Naresh Kamboju <naresh.kamboju@linaro.org>,
        Abel Vesa <abel.vesa@linaro.org>,
        Alexander Stein <alexander.stein@ew.tq-group.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        John Stultz <jstultz@google.com>,
        Doug Anderson <dianders@chromium.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Maxim Kiselev <bigunclemax@gmail.com>,
        Maxim Kochetkov <fido_max@inbox.ru>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Luca Weiss <luca.weiss@fairphone.com>,
        Colin Foster <colin.foster@in-advantage.com>,
        Martin Kepplinger <martin.kepplinger@puri.sm>,
        Jean-Philippe Brucker <jpb@kernel.org>,
        kernel-team@android.com, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
        devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
        linux-acpi@vger.kernel.org
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Precedence: bulk

On Mon, Jan 30, 2023 at 7:14 AM Andy Shevchenko
<andriy.shevchenko@linux.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