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

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[ Upstream commit 819bee01eea06282d7bda17d46caf29cae4f6d84 ]

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>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-4-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 11:43:07 +02:00
committed by Greg Kroah-Hartman
parent f1b4a5005c
commit cd604e8e99
1 changed files with 2 additions and 0 deletions
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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -1036,8 +1036,10 @@ static int amdgpu_dm_audio_component_get_eld(struct device *kdev, int 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;
}