'Get the list of linked devices for a particular snapVx snapshot.
:param array: the array serial number
:param source_device_id: source device id
:param snap_name: the snapshot name
:returns: linked_device_list'

def get_snap_linked_device_list(self, array, source_device_id, snap_name):

    linked_device_list = []
    snap_list = self._find_snap_vx_source_sessions(array, source_device_id)
    for snap in snap_list:
        if (snap['snap_name'] == snap_name):
            linked_device_list = snap['linked_vols']
    return linked_device_list
