linux-kernel - Re: [PATCH v2] drm/bridge: panel: Fix device link for DRM_BRIDGE_ATTACH_NO

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Date:   Wed, 20 Sep 2023 19:02:17 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     andrzej.hajda@...el.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     rfoss@...nel.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com,
        daniel@...ll.ch, ulf.hansson@...aro.org, victor.liu@....com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, ehristev@...labora.com, wenst@...omium.org
Subject: Re: [PATCH v2] drm/bridge: panel: Fix device link for
 DRM_BRIDGE_ATTACH_NO_CONNECTOR

Hi,

On Wed, 20 Sep 2023 10:27:27 +0200, AngeloGioacchino Del Regno wrote:
> When external bridges are attached with DRM_BRIDGE_ATTACH_NO_CONNECTOR,
> the panel bridge may also get the same flag, but in the .attach()
> callback for the panel bridge a device link is added only when this
> flag is not present; To make things worse, the .detach() callback
> tries to delete the device link unconditionally and without checking
> if it was created in the first place, crashing the kernel with a NULL
> pointer kernel panic upon calling panel_bridge_detach().
> 
> [...]

Thanks, Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)

[1/1] drm/bridge: panel: Fix device link for DRM_BRIDGE_ATTACH_NO_CONNECTOR
      https://cgit.freedesktop.org/drm/drm-misc/commit/?id=887878014534186cc50dbd16a62e744ad217b4b1

-- 
Neil