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 12:03:10 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: 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>
Cc: 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 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

Thanks,
Neil