Name
blk_requeue_request — 
     put a request back on queue
 
Synopsis
| void blk_requeue_request ( | struct request_queue * q, | 
|  | struct request * rq ); | 
 
Arguments
- q
- 
     request queue where request should be inserted
     
- rq
- 
     request to be inserted
     
Description
   Drivers often keep queueing requests until the hardware cannot accept
   more, when that condition happens we need to put the request back
   on the queue. Must be called with queue lock held.