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

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[ Upstream commit b54c14f82428c8a602392d4cae1958a71a578132 ]

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-v2-8-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 11:43:11 +02:00
committed by Greg Kroah-Hartman
parent 6b57c63f5b
commit 1cd3e56a07
1 changed files with 2 additions and 0 deletions
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drivers/gpu/drm/radeon/radeon_audio.c
+2
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@@ -775,8 +775,10 @@ static int radeon_audio_component_get_eld(struct device *kdev, int port,
if (!dig->pin || dig->pin->id != port)
continue;
*enabled = true;
mutex_lock(&connector->eld_mutex);
ret = drm_eld_size(connector->eld);
memcpy(buf, connector->eld, min(max_bytes, ret));
mutex_unlock(&connector->eld_mutex);
break;
}