Name
blk_queue_unprep_rq — 
     set an unprepare_request function for queue
 
Synopsis
| void blk_queue_unprep_rq ( | struct request_queue * q, | 
|  | unprep_rq_fn * ufn ); | 
 
Arguments
- q
- 
     queue
     
- ufn
- 
     unprepare_request function
     
Description
   It's possible for a queue to register an unprepare_request callback
   which is invoked before the request is finally completed. The goal
   of the function is to deallocate any data that was allocated in the
   prepare_request callback.