linux-kernel - Re: [PATCH v1 9/9] of: property: Simplify of_link_to

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Message-ID: <CAGETcx_SdxJKV56jGSx8GbmA4y_zaoP6z8n8xKZGZbCcmewvDQ@mail.gmail.com>
Date:   Fri, 12 Aug 2022 17:37:05 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Len Brown <lenb@...nel.org>, Abel Vesa <abel.vesa@...aro.org>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        John Stultz <jstultz@...gle.com>,
        Doug Anderson <dianders@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v1 9/9] of: property: Simplify of_link_to_phandle()

On Fri, Aug 12, 2022 at 2:47 AM Tony Lindgren <tony@...mide.com> wrote:
>
> Hi,
>
> * Saravana Kannan <saravanak@...gle.com> [220810 05:54]:
> > The driver core now:
> > - Has the parent device of a supplier pick up the consumers if the
> >   supplier never has a device created for it.
> > - Ignores a supplier if the supplier has no parent device and will never
> >   be probed by a driver
> >
> > And already prevents creating a device link with the consumer as a
> > supplier of a parent.
> >
> > So, we no longer need to find the "compatible" node of the supplier or
> > do any other checks in of_link_to_phandle(). We simply need to make sure
> > that the supplier is available in DT.
>
> This patch fixes booting for me, so it should be applied as a fix and
> tagged with:
>
> Fixes: 5a46079a9645 ("PM: domains: Delete usage of driver_deferred_probe_check_state()")
>
> If there are dependencies to the other patches in this series, it might
> make sense to revert commit 5a46079a9645 instead.

Yes, there are dependencies on the rest of the patches in this series.
For linux-next, I think we should pick up this series once we get more
Tested-bys.

 So if 5a46079a9645 is causing any regression in stable branches, we
should pick up the revert series [1] instead of this series we are
replying to.

[1] - https://lore.kernel.org/all/20220727185012.3255200-1-saravanak@google.com/

> Anyways, thanks for fixing the issue, for this patch:
>
> Reviewed-by: Tony Lindgren <tony@...mide.com>
> Tested-by: Tony Lindgren <tony@...mide.com>

Thanks!

> For the process, looks like the earlier series got merged despite the
> issues reported.

If I'm not mistaken, the issues were reported after the series got
picked up. And the series got some tested-by s before it was picked
up. And once it's in git history, we obviously can't drop it.

> And we had non-booting Linux next for at least some SoCs
> for weeks. And now we are about to have a non-booting -rc1 unless things
> get fixed fast. Annoying glitches, sigh..

Sorry for breaking some boards -- so mean "creative" corner cases :)

This rewrite is way more flexible (removes a lot of limitations in
fw_devlink) and hopefully this handles all the corner cases. We'll
see.

-Saravana