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

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

On Fri, Jan 27, 2023 at 11:33:38PM -0800, Saravana Kannan wrote:
> On Fri, Jan 27, 2023 at 1:27 AM Andy Shevchenko
> <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> > On Thu, Jan 26, 2023 at 04:11:31PM -0800, Saravana Kannan wrote:

...

> > > +     /*
> > > +      * 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);
> >
> > Do not dereference fwnode in struct device. Use dev_fwnode() for that.
> >
> >         struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev);
> >
> >         if (!fwnode->dev)
> >                 fwnode_dev_initialized(fwnode, false);
> 
> Honestly, we should work towards NOT needing dev_fwnode().

Honestly, it's that We SHOULD go to avoid any direct dereference of fwnode from
the struct device. I explained you in the comment in the other patch.

> The
> function literally dereferences dev->fwnode or the one inside of_node.
> So my dereference is fine. The whole "fwnode might not be set for
> devices with of_node" is wrong and we should fix that instead of
> writing wrappers to work around it.
> 
> Also, for now I'm going to leave this as if for the same reasons as I
> mentioned in Patch 1.

Same.


-- 
With Best Regards,
Andy Shevchenko