From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Johan Hovold <johan+linaro@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>,
Andrzej Hajda <andrzej.hajda@intel.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
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>, 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>,
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,
stable@vger.kernel.org,
Bjorn Andersson <quic_bjorande@quicinc.com>
Subject: Re: [PATCH 5/6] phy: qcom-qmp-combo: fix drm bridge registration
Date: Thu, 22 Feb 2024 23:11:17 +0200 [thread overview]
Message-ID: <CAA8EJppnHY=jDYjgTn+2dF_zmGwM9+KsUS6vOyPB_wa9W0v-UA@mail.gmail.com> (raw)
In-Reply-To: <20240217150228.5788-6-johan+linaro@kernel.org>
On Sat, 17 Feb 2024 at 17:03, Johan Hovold <johan+linaro@kernel.org> wrote:
>
> Due to a long-standing issue in driver core, drivers may not probe defer
> after having registered child devices to avoid triggering a probe
> deferral loop (see fbc35b45f9f6 ("Add documentation on meaning of
> -EPROBE_DEFER")).
>
> This could potentially also trigger a bug in the DRM bridge
> implementation which does not expect bridges to go away even if device
> links may avoid triggering this (when enabled).
>
> Move registration of the DRM aux bridge to after looking up clocks and
> other resources.
>
> Note that PHY creation can in theory also trigger a probe deferral when
> a 'phy' supply is used. This does not seem to affect the QMP PHY driver
> but the PHY subsystem should be reworked to address this (i.e. by
> separating initialisation and registration of the PHY).
>
> Fixes: 35921910bbd0 ("phy: qcom: qmp-combo: switch to DRM_AUX_BRIDGE")
> Fixes: 1904c3f578dc ("phy: qcom-qmp-combo: Introduce drm_bridge")
> Cc: stable@vger.kernel.org # 6.5
> Cc: Bjorn Andersson <quic_bjorande@quicinc.com>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
> drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
--
With best wishes
Dmitry
next prev parent reply other threads:[~2024-02-22 21:11 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 [this message]
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
2024-02-23 15:06 ` (subset) " Dmitry Baryshkov
2024-03-06 17:47 ` Vinod Koul
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