Re: [PATCH scsi-misc-2.6 04/04] scsi: remove unnecessary scsi_wait_req_end_io()

[Tejun Heo <htejun@gmail.com>]

 Hello, James.

On Sat, May 14, 2005 at 11:26:23AM -0400, James Bottomley wrote:
> On Sat, 2005-05-14 at 22:57 +0900, Tejun Heo wrote:
> > 	As all requests are now terminated via scsi midlayer, we don't
> > 	need to set end_io for special reqs, remove it.
> 
> This statement is untrue as long as the prep function can return
> BLKPREP_KILL, which it still does even after your patch set, so the
> scsi_wait_req_end_io() is still necessary to catch this case.

 BLKPREP_KILL is only used to kill illegal (unpreparable, way-off)
requests.  Actually, for special requests, the only tests performed
are req->flags and CDB_SIZE tests.  I don't think anyone does/will
submit that illegal requests via scsi_wait_req().  And if so, it will
be a bug.

 I don't feel strong against keeping the end_io routine but, if you
decide to keep the routine, please consider adding a comment
explaining the peculiar path the routine might be used, such that
other people don't have to wander through the code.

 Thanks.

-- 
tejun