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drm/vc4: hdmi: use eld_mutex to protect access to connector->eld

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[ Upstream commit 81a9a93b16 ]

Reading access to connector->eld can happen at the same time the
drm_edid_to_eld() updates the data. Take the newly added eld_mutex in
order to protect connector->eld from concurrent access.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-10-c9bce1ee8bea@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Baryshkov
2024-12-06 11:43:13 +02:00
committed by Greg Kroah-Hartman
parent 300c6efc95
commit 662c20e449
1 changed files with 2 additions and 2 deletions
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drivers/gpu/drm/vc4/vc4_hdmi.c
+2 -2
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@@ -2655,9 +2655,9 @@ static int vc4_hdmi_audio_get_eld(struct device *dev, void *data,
struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
struct drm_connector *connector = &vc4_hdmi->connector;
mutex_lock(&vc4_hdmi->mutex);
mutex_lock(&connector->eld_mutex);
memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
mutex_unlock(&vc4_hdmi->mutex);
mutex_unlock(&connector->eld_mutex);
return 0;
}