MIME-Version: 1.0
References: <20230127001141.407071-1-saravanak@google.com> <20230127001141.407071-7-saravanak@google.com>
 <Y9OaaC806Ywg7rM9@smile.fi.intel.com>
In-Reply-To: <Y9OaaC806Ywg7rM9@smile.fi.intel.com>
From:   Saravana Kannan <saravanak@google.com>
Date:   Fri, 27 Jan 2023 23:34:19 -0800
Message-ID: <CAGETcx9XGq20kagmVXwEV6MF9mp9Ta5ra0+Ynhb7GiUKnxkWqg@mail.gmail.com>
Subject: Re: [PATCH v2 06/11] driver core: fw_devlink: Allow marking a fwnode
 link as being part of a cycle
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Cristian Marussi <cristian.marussi@arm.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <maz@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Magnus Damm <magnus.damm@gmail.com>,
        Len Brown <lenb@kernel.org>,
        Daniel Scally <djrscally@gmail.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Tony Lindgren <tony@atomide.com>,
        Linux Kernel Functional Testing <lkft@linaro.org>,
        Naresh Kamboju <naresh.kamboju@linaro.org>,
        Abel Vesa <abel.vesa@linaro.org>,
        Alexander Stein <alexander.stein@ew.tq-group.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        John Stultz <jstultz@google.com>,
        Doug Anderson <dianders@chromium.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Maxim Kiselev <bigunclemax@gmail.com>,
        Maxim Kochetkov <fido_max@inbox.ru>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Luca Weiss <luca.weiss@fairphone.com>,
        Colin Foster <colin.foster@in-advantage.com>,
        Martin Kepplinger <martin.kepplinger@puri.sm>,
        Jean-Philippe Brucker <jpb@kernel.org>,
        kernel-team@android.com, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
        devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
        linux-acpi@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Fri, Jan 27, 2023 at 1:33 AM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Thu, Jan 26, 2023 at 04:11:33PM -0800, Saravana Kannan wrote:
> > To improve detection and handling of dependency cycles, we need to be
> > able to mark fwnode links as being part of cycles. fwnode links marked
> > as being part of a cycle should not block their consumers from probing.
>
> ...
>
> > +     list_for_each_entry(link, &fwnode->suppliers, c_hook) {
> > +             if (link->flags & FWLINK_FLAG_CYCLE)
> > +                     continue;
> > +             return link->supplier;
>
> Hmm...

Thanks!

>
>                 if (!(link->flags & FWLINK_FLAG_CYCLE))
>                         return link->supplier;
>
> ?
>
> > +     }
> > +
> > +     return NULL;
>
> ...
>
> > -     if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) &&
> > -         !fw_devlink_is_permissive()) {
> > -             sup_fw = list_first_entry(&dev->fwnode->suppliers,
> > -                                       struct fwnode_link,
> > -                                       c_hook)->supplier;
> > +     sup_fw = fwnode_links_check_suppliers(dev->fwnode);
>
> dev_fwnode() ?
>
> ...
>
> > -     val = !list_empty(&dev->fwnode->suppliers);
> > +     mutex_lock(&fwnode_link_lock);
> > +     val = !!fwnode_links_check_suppliers(dev->fwnode);
>
> Ditto?

Similar response as Patch 1 and Patch 4.


-Saravana