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In smmu_pmu_probe(), there is put_cpu() in the error path, which is wrong because we use raw_smp_processor_id() to get the cpu ID, not get_cpu(), remove it. While we are at it, kill 'out_cpuhp_err' altogether and just return err if we fail to add the hotplug instance. Acked-by: Robin Murphy <[email protected]> Acked-by: Will Deacon <[email protected]> Signed-off-by: Hanjun Guo <[email protected]> Signed-off-by: Catalin Marinas <[email protected]>