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Date: Tue, 31 Jan 2023 10:13:37 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: Saravana Kannan <saravanak@...gle.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
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>,
Len Brown <lenb@...nel.org>,
Daniel Scally <djrscally@...il.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Tony Lindgren <tony@...mide.com>,
Linux Kernel Functional Testing <lkft@...aro.org>,
Naresh Kamboju <naresh.kamboju@...aro.org>,
Abel Vesa <abel.vesa@...aro.org>,
Alexander Stein <alexander.stein@...tq-group.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
John Stultz <jstultz@...gle.com>,
Doug Anderson <dianders@...omium.org>,
Guenter Roeck <linux@...ck-us.net>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Maxim Kiselev <bigunclemax@...il.com>,
Maxim Kochetkov <fido_max@...ox.ru>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Luca Weiss <luca.weiss@...rphone.com>,
Colin Foster <colin.foster@...advantage.com>,
Martin Kepplinger <martin.kepplinger@...i.sm>,
Jean-Philippe Brucker <jpb@...nel.org>,
kernel-team@...roid.com, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
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 08:01:17PM -0800, Saravana Kannan wrote:
> 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.
>
Correct, and this one is not even arm32. But it is just reusing a driver
that needs to be supported even on arm32.
Not sure on how to proceed. As a simple way to check, I added a NULL check
for fwnode building on top of Andy's suggestion[1]. That works.
Also the driver in question on arm64 FVP model is drivers/mfd/vexpress-sysreg.c
mfd_add_device() in drivers/mfd/mfd-core.c allows addition of devices without
of_node/fwnode. I am sure returning error like[2] will break many platforms
but I just wanted to confirm the root cause and [2] fixes the boot without
NULL check for fwnode in gpiochip_setup_dev().
Hope this helps.
--
Regards,
Sudeep
[1]
-->8
diff --git i/drivers/gpio/gpiolib.c w/drivers/gpio/gpiolib.c
index b23140c6485f..e162f13aa2c9 100644
--- i/drivers/gpio/gpiolib.c
+++ w/drivers/gpio/gpiolib.c
@@ -577,13 +577,15 @@ static void gpiodevice_release(struct device *dev)
static int gpiochip_setup_dev(struct gpio_device *gdev)
{
int ret;
+ struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev);
/*
* 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);
+ if (fwnode && !fwnode->dev)
+ fwnode_dev_initialized(fwnode, false);
+
ret = gcdev_register(gdev, gpio_devt);
if (ret)
return ret;
[2]
-->8
diff --git i/drivers/mfd/mfd-core.c w/drivers/mfd/mfd-core.c
index 16d1861e9682..3b2c4b0e9a2a 100644
--- i/drivers/mfd/mfd-core.c
+++ w/drivers/mfd/mfd-core.c
@@ -231,9 +231,11 @@ static int mfd_add_device(struct device *parent, int id,
}
}
- if (!pdev->dev.of_node)
+ if (!pdev->dev.of_node) {
pr_warn("%s: Failed to locate of_node [id: %d]\n",
cell->name, platform_id);
+ goto fail_alias;
+ }
}
mfd_acpi_add_device(cell, pdev);
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