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the smu driver_table is used for all types of smu tables data transcation (e.g: PPtable, Metrics, i2c, Ecc..). it is necessary to hold this lock to avoiding data tampering during the i2c read operation. Signed-off-by: Yang Wang <kevinyang.wang@amd.com> Reviewed-by: Lijo Lazar <lijo.lazar@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>