linux-kernel - Re: (subset) [PATCH 0/3] drm/bridge: imx: A few fixes

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Message-Id: <DG0BSWR9XRZS.29D743F5RWI8N@bootlin.com>
Date: Wed, 28 Jan 2026 16:26:22 +0100
From: "Luca Ceresoli" <luca.ceresoli@...tlin.com>
To: "Liu Ying" <victor.liu@....com>, "Andrzej Hajda"
 <andrzej.hajda@...el.com>, "Neil Armstrong" <neil.armstrong@...aro.org>,
 "Robert Foss" <rfoss@...nel.org>, "Laurent Pinchart"
 <Laurent.pinchart@...asonboard.com>, "Jonas Karlman" <jonas@...boo.se>,
 "Jernej Skrabec" <jernej.skrabec@...il.com>, "Maarten Lankhorst"
 <maarten.lankhorst@...ux.intel.com>, "Maxime Ripard" <mripard@...nel.org>,
 "Thomas Zimmermann" <tzimmermann@...e.de>, "David Airlie"
 <airlied@...il.com>, "Simona Vetter" <simona@...ll.ch>, "Shawn Guo"
 <shawnguo@...nel.org>, "Sascha Hauer" <s.hauer@...gutronix.de>,
 "Pengutronix Kernel Team" <kernel@...gutronix.de>, "Fabio Estevam"
 <festevam@...il.com>
Cc: <dri-devel@...ts.freedesktop.org>, <imx@...ts.linux.dev>,
 <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: (subset) [PATCH 0/3] drm/bridge: imx: A few fixes

Hello Liu,

On Wed Jan 28, 2026 at 2:50 AM CET, Liu Ying wrote:
> Hi Luca,
>
> On Tue, Jan 27, 2026 at 12:35:47PM +0100, Luca Ceresoli wrote:
>>
>> On Fri, 23 Jan 2026 17:22:14 +0800, Liu Ying wrote:
>>> This patch series contains 3 bug fixes for i.MX8QXP DRM bridges.
>>> Each patch fixes a NULL pointer dereference issue and stands alone.
>>>
>>>
>>
>> Applied, thanks!
>>
>> [1/3] drm/bridge: imx8qxp-ldb: Fix NULL pointer dereference in imx8qxp_ldb_bridge_destroy()
>>       commit: 852c68bf42965ee38b465d2d6f7b965eb0b5dc1d
>> [2/3] drm/bridge: imx8qxp-pxl2dpi: Fix NULL pointer dereference in imx8qxp_pxl2dpi_bridge_destroy()
>>       commit: db7e7ea838c916ee4cdf26bee126fd36f58295dc
>
> Any reason why patch 3/3 is not applied?

Yes, the reason is there's a patch conflict and I still have to find out
how to handle it.

Patch 3 by the rules [0] should go to drm-misc-fixes because the bug (added
by [1]) is already on Linus' master tree (since v6.17), but it does not
apply there due to a conflict with an unrelated change [2] currently on
drm-misc-next.

Note that [1] and [2] are the two commits mentioned in your 'Fixes: 'tags.

I had a chat with Maxime on #dir-devel about how to handle this situation
but still haven't got a final answer.

I guess the correct way is:

 1. apply patch 3 on drm-misc-next, where it applies cleanly
 2. send a modified patch for drm-misc-fixes, to fix ASAP the master branch

Would you send the patch as in item 2, so it can be applied to
drm-misc-fixes and have master fixed ASAP? Note iit should not mention [2]
in the Fixes: tag because [2] is not yet on master. I can send it of course
but you can test on hardware so that would be the best option (and I'm a
bit overloaded at the moment).

[0] https://drm.pages.freedesktop.org/maintainer-tools/committer/committer-drm-misc.html
[1] commit 99764593528f ("drm/bridge: imx8qxp-pixel-combiner: convert to devm_drm_bridge_alloc() API")
[2] commit ae754f049ce1 ("drm/bridge: imx8qxp-pixel-combiner: get/put the next bridge")

Luca

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com