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Make valid_state() check if the ->enter callback is present in suspend_ops (only PM_SUSPEND_TO_IDLE can be valid otherwise) and make sleep_state_supported() call valid_state() consistently to validate the states other than PM_SUSPEND_TO_IDLE. While at it, clean up the comment in valid_state(). No expected functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>