linux-kernel - Re: [PATCH] drm/bridge: anx7625: Zero error variable when panel bridge not present

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Message-ID: <CAG3jFysv_LSM2+j5jWmC-zM-jik0WdGjE7Mwm=quAabG_LzB6A@mail.gmail.com>
Date:   Wed, 15 Jun 2022 18:04:39 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, kernel@...labora.com,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        José Expósito <jose.exposito89@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Tzung-Bi Shih <tzungbi@...gle.com>,
        Xin Ji <xji@...logixsemi.com>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: anx7625: Zero error variable when panel
 bridge not present

On Tue, 14 Jun 2022 at 09:52, AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 13/06/22 18:37, Nícolas F. R. A. Prado ha scritto:
> > While parsing the DT, the anx7625 driver checks for the presence of a
> > panel bridge on endpoint 1. If it is missing, pdata->panel_bridge stores
> > the error pointer and the function returns successfully without first
> > cleaning that variable. This is an issue since other functions later
> > check for the presence of a panel bridge by testing the trueness of that
> > variable.
> >
> > In order to ensure proper behavior, zero out pdata->panel_bridge before
> > returning when no panel bridge is found.
> >
> > Fixes: 9e82ea0fb1df ("drm/bridge: anx7625: switch to devm_drm_of_get_bridge")
> > Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> >
>
> I would've preferred s/zero out/cleanup/g but it's also fine as you wrote it.
> Besides, good catch!
>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>

Applied to drm-misc-next