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It is strange to only return early for -EBUSY state and left other errors to be still measured execution time. As for error cases, the elapsed_ns computed actually is not quite accurate and meaningful for governor to use. So let's simply return for all error cases. Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>