linux-kernel - Re: [PATCH 0/6] soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free

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Message-ID: <CAA8EJppYHdSmsWMk-u=QaAaHWqjFj8zs4CF947eeex6iV4dsYw@mail.gmail.com>
Date: Fri, 23 Feb 2024 16:18:08 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: neil.armstrong@...aro.org
Cc: Johan Hovold <johan@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Robert Foss <rfoss@...nel.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Vinod Koul <vkoul@...nel.org>, Johan Hovold <johan+linaro@...nel.org>, 
	Jonas Karlman <jonas@...boo.se>, Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Kuogee Hsieh <quic_khsieh@...cinc.com>, 
	freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	linux-phy@...ts.infradead.org
Subject: Re: [PATCH 0/6] soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free

On Fri, 23 Feb 2024 at 15:52, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> On 23/02/2024 13:51, Johan Hovold wrote:
> > On Fri, Feb 23, 2024 at 12:03:10PM +0100, Neil Armstrong wrote:
> >> On 23/02/2024 12:02, Neil Armstrong wrote:
> >>> Hi,
> >>>
> >>> On Sat, 17 Feb 2024 16:02:22 +0100, Johan Hovold wrote:
> >>>> Starting with 6.8-rc1 the internal display sometimes fails to come up on
> >>>> machines like the Lenovo ThinkPad X13s and the logs indicate that this
> >>>> is due to a regression in the DRM subsystem [1].
> >>>>
> >>>> This series fixes a race in the pmic_glink_altmode driver which was
> >>>> exposed / triggered by the transparent DRM bridges rework that went into
> >>>> 6.8-rc1 and that manifested itself as a bridge failing to attach and
> >>>> sometimes triggering a NULL-pointer dereference.
> >>>>
> >>>> [...]
> >>>
> >>> Thanks, Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-fixes)
> >>>
> >>> [1/6] drm/bridge: aux-hpd: fix OF node leaks
> >>>         https://cgit.freedesktop.org/drm/drm-misc/commit/?id=9ee485bdda68d6d3f5728cbe3150eb9013d7d22b
> >>> [2/6] drm/bridge: aux-hpd: separate allocation and registration
> >>>         (no commit info)
> >>> [3/6] soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free
> >>>         (no commit info)
> >>> [4/6] soc: qcom: pmic_glink: Fix boot when QRTR=m
> >>>         (no commit info)
> >>> [5/6] phy: qcom-qmp-combo: fix drm bridge registration
> >>>         (no commit info)
> >>> [6/6] phy: qcom-qmp-combo: fix type-c switch registration
> >>>         (no commit info)
> >>>
> >>
> >> To clarify, I only applied patch 1 to drm-misc-fixes
> >
> > Ok, but can you please not do that? :)
> >
> > These patches should go in through the same tree to avoid conflicts.
> >
> > I discussed this with Bjorn and Dmitry the other day and the conclusion
> > was that it was easiest to take all of these through DRM.
>
> I only applied patch 1, which is a standalone fix and goes into a separate tree,
> for the next patches it would be indeed simpler for them to go via drm-misc when
> they are properly acked.

I think PHY patches can go through a usual route (phy/next or
phy/fixes). For patches 3 and 4 I'd need an ack from Bjorn to merge
them through drm-misc-next or drm-misc-fixes.


-- 
With best wishes
Dmitry