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a questioon about "rxCallback ( arg, *packet );"

It writes in spru616 "The rxCallback function completes the operation started by the call to the IOM mini-driver's mdSubmitChan function. The pipe associated with the receive channel is updated to show the received data. Another mdSubmitChan operation is started to keep the flow of data uninterrupted."

Anyone can explain "Another mdSubmitChan operation is started to keep the flow of data uninterrupted."? I don't understand the relationship between mdSunbmitChan and  "data uninterrupted". Thanks a lot!