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

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Date: Fri, 23 Feb 2024 13:51:39 +0100
From: Johan Hovold <johan@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: 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>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.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, 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.

With Vinod acking the PHY patches, I believe you have what you need to
merge the whole series now?

Johan