linux-kernel - Re: [PATCH v2] drm/bridge: analogix_dp: Grab runtime PM reference for DP-AUX

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Message-ID: <CA+ASDXOEv3xigBaEwtYcGM7Q9uNHrwijoWTHoiLg--UT=vA7TA@mail.gmail.com>
Date:   Wed, 5 Jan 2022 11:55:05 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>
Cc:     Sean Paul <sean@...rly.run>, Jonas Karlman <jonas@...boo.se>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        stable <stable@...r.kernel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: Re: [PATCH v2] drm/bridge: analogix_dp: Grab runtime PM reference for DP-AUX

(updating Andrzej's email)

On Fri, Oct 1, 2021 at 2:50 PM Brian Norris <briannorris@...omium.org> wrote:
> If the display is not enable()d, then we aren't holding a runtime PM
> reference here. Thus, it's easy to accidentally cause a hang, if user
> space is poking around at /dev/drm_dp_aux0 at the "wrong" time.
>
> Let's get the panel and PM state right before trying to talk AUX.
>
> Fixes: 0d97ad03f422 ("drm/bridge: analogix_dp: Remove duplicated code")
> Cc: <stable@...r.kernel.org>
> Cc: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
>
> Changes in v2:
> - Fix spelling in Subject
> - DRM_DEV_ERROR() -> drm_err()
> - Propagate errors from un-analogix_dp_prepare_panel()
>
>  .../drm/bridge/analogix/analogix_dp_core.c    | 21 ++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)

Ping? Do I need to do anything more here?

Thanks,
Brian