linux-kernel - Re: [PATCH 4/5] of: dynamic: Move dead property list check into property add/update functions

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Date:   Thu, 3 Aug 2023 14:42:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Frank Rowand <frowand.list@...il.com>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] of: dynamic: Move dead property list check into
 property add/update functions

On Wed, Aug 2, 2023 at 9:12 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Tue, Aug 01, 2023 at 03:54:47PM -0600, Rob Herring wrote:
> > The changeset code checks for a property in the deadprops list when
> > adding/updating a property, but of_add_property() and
> > of_update_property() do not. As the users of these functions are pretty
> > simple, they have not hit this scenario or else the property lists
> > would get corrupted.
>
> ...
>
> Seems like this...
>
> > +     /* If the property is in deadprops then it must be removed */
> > +     for (next = &np->deadprops; *next; next = &(*next)->next) {
> > +             if (*next == prop) {
> > +                     *next = prop->next;
> > +                     break;
> > +             }
> > +     }
>
> >       prop->next = NULL;
>
> ...
>
> > +     for (next = &np->deadprops; *next; next = &(*next)->next) {
> > +             if (*next == newprop) {
> > +                     *next = newprop->next;
> > +                     newprop->next = NULL;
> > +                     break;
> > +             }
> > +     }
>
> ...is a dup of this. Are you planing to have a helper or at least conditional
> for_each_*() macro for them?

At least the latter would be more clean-up than I want to do here
because this will be backported to stable. We have an iterator for
properties list, but note how this iterates on the "next" ptr address.
So it's a bit different from the normal iterators.

I'll go ahead and add a helper.

Rob