drm/amdgpu: add mutex lock for cper ring
Avoid the confliction between read and write of ring buffer. Signed-off-by:Tao Zhou <tao.zhou1@amd.com> Reviewed-by:
Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
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