Name
atapi_drain_needed — 
     Check whether data transfer may overflow
 
Synopsis
| int atapi_drain_needed ( | struct request * rq ); | 
 
Description
   ATAPI commands which transfer variable length data to host
   might overflow due to application error or hardare bug.  This
   function checks whether overflow should be drained and ignored
   for request.
RETURNS
   1 if ; otherwise, 0.