linux-kernel - Re: [PATCH AUTOSEL 6.1 18/22] drm/mediatek: dp: Change logging to dev for mtk_dp_aux

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Message-ID: <ZP7jp1UDgJMqJzO4@duo.ucw.cz>
Date:   Mon, 11 Sep 2023 11:53:43 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chen-Yu Tsai <wenst@...omium.org>, CK Hu <ck.hu@...iatek.com>,
        Alexandre Mergnat <amergnat@...libre.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        p.zabel@...gutronix.de, airlied@...il.com, daniel@...ll.ch,
        matthias.bgg@...il.com, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 6.1 18/22] drm/mediatek: dp: Change logging to
 dev for mtk_dp_aux_transfer()

Hi!

> From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> 
> [ Upstream commit fd70e2019bfbcb0ed90c5e23839bf510ce6acf8f ]
> 
> Change logging from drm_{err,info}() to dev_{err,info}() in functions
> mtk_dp_aux_transfer() and mtk_dp_aux_do_transfer(): this will be
> essential to avoid getting NULL pointer kernel panics if any kind
> of error happens during AUX transfers happening before the bridge
> is attached.
> 
> This may potentially start happening in a later commit implementing
> aux-bus support, as AUX transfers will be triggered from the panel
> driver (for EDID) before the mtk-dp bridge gets attached, and it's
> done in preparation for the same.

This is preparation for patches we are not going to apply to
stable. Please drop.

BR,
								Pavel
-- 
DENX Software Engineering GmbH,        Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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