From: Neil Armstrong <neil.armstrong@linaro.org>
To: Johan Hovold <johan+linaro@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Andrzej Hajda <andrzej.hajda@intel.com>,
Robert Foss <rfoss@kernel.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Vinod Koul <vkoul@kernel.org>
Cc: Jonas Karlman <jonas@kwiboo.se>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Kishon Vijay Abraham I <kishon@kernel.org>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
Rob Clark <robdclark@gmail.com>,
Abhinav Kumar <quic_abhinavk@quicinc.com>,
Kuogee Hsieh <quic_khsieh@quicinc.com>,
freedreno@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-phy@lists.infradead.org
Subject: Re: [PATCH 0/6] soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free
Date: Fri, 23 Feb 2024 15:54:05 +0100 [thread overview]
Message-ID: <3b6dc98a-a13d-4958-b8b4-003d27c84f89@linaro.org> (raw)
In-Reply-To: <20240217150228.5788-1-johan+linaro@kernel.org>
On 17/02/2024 16:02, 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.
>
> The intermittent hard resets that have also been reported since 6.8-rc1
> unfortunately still remains and suggests that we are dealing with two
> separate regressions. There is some indication that also the hard resets
> (e.g. due to register accesses to unclocked hardware) are also due to
> changes in the DRM subsystem as it happens around the time that the eDP
> panel and display controller would be initialised during boot (the
> runtime PM rework?). This remains to be verified, however.
>
> Included is also a fix for a related OF node reference leak in the
> aux-hpd driver found through inspection when reworking the driver.
>
> The use-after-free bug is triggered by a probe deferral and highlighted
> some further bugs in the involved drivers, which were registering child
> devices before deferring probe. This behaviour is not correct and can
> both trigger probe deferral loops and potentially also further issues
> with the DRM bridge implementation.
>
> This series can either go through the Qualcomm SoC tree (pmic_glink) or
> the DRM tree. The PHY patches do not depend on the rest of the series
> and could possibly be merged separately through the PHY tree.
>
> Whichever gets this to mainline the fastest.
>
> Johan
>
>
> [1] https://lore.kernel.org/lkml/ZctVmLK4zTwcpW3A@hovoldconsulting.com/
>
>
> Johan Hovold (5):
> drm/bridge: aux-hpd: fix OF node leaks
> drm/bridge: aux-hpd: separate allocation and registration
> soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free
> phy: qcom-qmp-combo: fix drm bridge registration
> phy: qcom-qmp-combo: fix type-c switch registration
>
> Rob Clark (1):
> soc: qcom: pmic_glink: Fix boot when QRTR=m
>
> drivers/gpu/drm/bridge/aux-hpd-bridge.c | 70 ++++++++++++++++++-----
> drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 16 +++---
> drivers/soc/qcom/pmic_glink.c | 21 +++----
> drivers/soc/qcom/pmic_glink_altmode.c | 16 +++++-
> include/drm/bridge/aux-bridge.h | 15 +++++
> 5 files changed, 102 insertions(+), 36 deletions(-)
>
For the serie:
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
After an offline discussion, Dmitry, it's ok to push the remaining patches to drm-misc-fixes.
Thanks,
Neil
next prev parent reply other threads:[~2024-02-23 14:54 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-17 15:02 [PATCH 0/6] soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free Johan Hovold
2024-02-17 15:02 ` [PATCH 1/6] drm/bridge: aux-hpd: fix OF node leaks Johan Hovold
2024-02-19 17:48 ` Markus Elfring
2024-02-20 7:24 ` Johan Hovold
2024-02-20 11:52 ` Julia Lawall
2024-02-20 11:55 ` Dmitry Baryshkov
2024-02-20 12:56 ` Julia Lawall
2024-02-20 13:35 ` Dmitry Baryshkov
2024-02-22 1:22 ` Bjorn Andersson
2024-02-22 21:00 ` Dmitry Baryshkov
2024-02-23 10:56 ` Neil Armstrong
2024-02-23 10:56 ` Neil Armstrong
2024-02-17 15:02 ` [PATCH 2/6] drm/bridge: aux-hpd: separate allocation and registration Johan Hovold
2024-02-22 2:06 ` Bjorn Andersson
2024-02-22 16:06 ` Johan Hovold
2024-02-22 20:57 ` Dmitry Baryshkov
2024-02-23 12:46 ` Johan Hovold
2024-02-17 15:02 ` [PATCH 3/6] soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free Johan Hovold
2024-02-20 8:25 ` Markus Elfring
2024-02-20 10:55 ` Markus Elfring
2024-02-20 11:26 ` Johan Hovold
2024-02-20 12:40 ` [3/6] " Markus Elfring
2024-02-22 2:11 ` [PATCH 3/6] " Bjorn Andersson
2024-02-22 21:10 ` Dmitry Baryshkov
2024-02-17 15:02 ` [PATCH 4/6] soc: qcom: pmic_glink: Fix boot when QRTR=m Johan Hovold
2024-02-22 2:18 ` Bjorn Andersson
2024-02-22 21:10 ` Dmitry Baryshkov
2024-02-23 11:04 ` Neil Armstrong
2024-02-17 15:02 ` [PATCH 5/6] phy: qcom-qmp-combo: fix drm bridge registration Johan Hovold
2024-02-19 9:03 ` Neil Armstrong
2024-02-22 2:21 ` Bjorn Andersson
2024-02-22 21:11 ` Dmitry Baryshkov
2024-02-23 12:09 ` Vinod Koul
2024-02-17 15:02 ` [PATCH 6/6] phy: qcom-qmp-combo: fix type-c switch registration Johan Hovold
2024-02-22 2:23 ` Bjorn Andersson
2024-02-22 21:12 ` Dmitry Baryshkov
2024-02-23 12:10 ` Vinod Koul
2024-02-23 11:02 ` [PATCH 0/6] soc: qcom: pmic_glink_altmode: fix drm bridge use-after-free Neil Armstrong
2024-02-23 11:03 ` Neil Armstrong
2024-02-23 12:51 ` Johan Hovold
2024-02-23 13:52 ` Neil Armstrong
2024-02-23 14:18 ` Dmitry Baryshkov
2024-02-23 14:28 ` Johan Hovold
2024-02-23 14:21 ` Johan Hovold
2024-02-23 14:38 ` Neil Armstrong
2024-02-23 14:52 ` Johan Hovold
2024-02-23 14:55 ` Neil Armstrong
2024-02-23 15:07 ` Dmitry Baryshkov
2024-02-23 14:54 ` Neil Armstrong [this message]
2024-02-23 15:06 ` (subset) " Dmitry Baryshkov
2024-03-06 17:47 ` Vinod Koul
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