Hi,
Is there any problem if end_that_request_last() in ace_fsm_dostate()
is moved to ACE_FSM_STATE_REQ_TRANSFER state from
ACE_FSM_STATE_REQ_COMPLETE state like the patch below?
BACKGROUND:
I'm working on refining request completion procedures like:
Before: 2 steps completion using "end_that_request_{first/chunk}"
and "end_that_request_last"
After: 1 step completion using generic block-layer helper
which I'm calling "blk_end_request"
"blk_end_request" works like calling "__end_that_request_first"
and "end_that_request_last".
<http://marc.info/?l=linux-kernel&m=116846938806220&w=2>
However, while auditing various drivers, I found xsysace driver
doesn't call end_that_request_first() and end_that_request_last()
at a time. It makes implementation of blk_end_request complicated.
So I'd like to move the end_that_request_last() call.
I think it's no problem because after the successful call to
end_that_request_first() in ACE_FSM_STATE_REQ_TRANSFER, the state
changes immediately to ACE_FSM_STATE_REQ_COMPLETE without interruption,
where it calls end_that_request_last().
There is no other transition to ACE_FSM_STATE_REQ_COMPLETE state.
Thanks,
Kiyoshi Ueda
Signed-off-by: Kiyoshi Ueda <[email protected]>
Signed-off-by: Jun'ichi Nomura <[email protected]>
--- 2.6.23-rc1-mm1/drivers/block/xsysace.c 2007-07-25 15:12:05.000000000 -0400
+++ xsysace/drivers/block/xsysace.c 2007-08-09 16:40:34.000000000 -0400
@@ -707,13 +707,14 @@ static void ace_fsm_dostate(struct ace_d
break;
}
+ /* Complete the block request */
+ blkdev_dequeue_request(ace->req);
+ end_that_request_last(ace->req, 1);
+
ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
break;
case ACE_FSM_STATE_REQ_COMPLETE:
- /* Complete the block request */
- blkdev_dequeue_request(ace->req);
- end_that_request_last(ace->req, 1);
ace->req = NULL;
/* Finished request; go to idle state */
-
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