linux-kernel - Re: [RFC PATCH 3/3] blk_end

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Message-Id: <20070111.120151.71083168.k-ueda@ct.jp.nec.com>
Date:	Thu, 11 Jan 2007 12:01:51 -0500 (EST)
From:	Kiyoshi Ueda <k-ueda@...jp.nec.com>
To:	jens.axboe@...cle.com
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	dm-devel@...hat.com, j-nomura@...jp.nec.com, k-ueda@...jp.nec.com
Subject: Re: [RFC PATCH 3/3] blk_end_request: caller change

Hi Jens,

On Thu, 11 Jan 2007 09:34:31 +0100, Jens Axboe <jens.axboe@...cle.com> wrote:
> > +static int cdrom_newpc_intr_dma_callback(void *arg)
> > +{
> > +	void **argv = (void **)arg;
> > +	struct request *rq = (struct request *)*argv++;
> > +	ide_drive_t *drive = (ide_drive_t *)argv++;
> > +	spinlock_t *ide_lock = (spinlock_t *)argv;
> > +
> > +	rq->data_len = 0;
> > +
> > +	cdrom_newpc_intr_callback_common(rq, drive, ide_lock);
> > +
> > +	return 0;
> > +}
> 
> And this is why, down right horrible. The callback should be correctly
> typed, pass down a request pointer ALWAYS.

OK.  I think everything such callbacks need can be obtained through
struct request.  (e.g. ide_drive_t can get by rq->q->queuedata and
ide_lock can get by rq->q->queue_lock.)
So I'll change the callback to pass a pointer to the request
instead of void *.

Thanks,
Kiyoshi Ueda

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