linux-kernel - Re: [PATCH v10 1/9] device property: Add remote endpoint to devcon matcher

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Message-ID: <CACeCKaeaQ+LHsnwdqtTA=O3Q=0dWz8_uNjXoNu5J_u4+HQLMsg@mail.gmail.com>
Date:   Fri, 20 Jan 2023 13:15:30 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Pin-yen Lin <treapking@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, Marek Vasut <marex@...x.de>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        Lyude Paul <lyude@...hat.com>, chrome-platform@...ts.linux.dev,
        Xin Ji <xji@...logixsemi.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, Allen Chen <allen.chen@....com.tw>,
        linux-acpi@...r.kernel.org, Hsin-Yi Wang <hsinyi@...omium.org>,
        Chen-Yu Tsai <wenst@...omium.org>
Subject: Re: [PATCH v10 1/9] device property: Add remote endpoint to devcon matcher

On Mon, Jan 16, 2023 at 5:07 AM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Prashant,
>
> On Thu, Jan 12, 2023 at 02:31:45PM -0800, Prashant Malani wrote:
> > HI Sakari,
> >
> > On Thu, Jan 12, 2023 at 5:32 AM Sakari Ailus
> > <sakari.ailus@...ux.intel.com> wrote:
> > >
> > > Hi Pin-yen,
> > >
> > > On Thu, Jan 12, 2023 at 12:20:56PM +0800, Pin-yen Lin wrote:
> > > > From: Prashant Malani <pmalani@...omium.org>
> > > > +             /*
> > > > +              * Some drivers may register devices for endpoints. Check
> > > > +              * the remote-endpoints for matches in addition to the remote
> > > > +              * port parent.
> > > > +              */
> > > > +             node = fwnode_graph_get_remote_endpoint(ep);
> > > > +             if (fwnode_device_is_available(node)) {
> > > > +                     ret = match(node, con_id, data);
> > > > +                     if (ret) {
> > > > +                             if (matches)
> > > > +                                     matches[count] = ret;
> > > > +                             count++;
> > > > +                     }
> > > > +             }
> > >
> > > Aren't you missing fwnode_handle-put(node) here??
> >
> > It shouldn't be necessary. We aren't break-ing/continue-ing here,
> > and fwnode_handle_put(node) is called latter in the loop [1][2]
>
> It is, but node is overwritten just below this chunk --- before
> fwnode_handle_put() is called on it.

Ack. Thanks for pointing that out. My bad!

Pin-yen, please make this update when you send out a v11.

BR,

-Prashant