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

Saravana Kannan
2023-01-31T04:02:00Z

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