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the original method will change the wptr value in wb. v2: furthur cleanup Signed-off-by: Emily Deng <Emily.Deng@amd.com> Signed-off-by: Monk Liu <Monk.Liu@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>