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From: Yuanyuan Zhong <yzhong@purestorage.com>
To: Keith Busch <kbusch@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>,
	linux-nvme@lists.infradead.org, sagi@grimberg.me,
	axboe@kernel.dk, linux-block@vger.kernel.org
Subject: Re: [PATCH 2/2] nvme: use return value from blk_execute_rq()
Date: Mon, 19 Apr 2021 10:27:42 -0700
Message-ID: <CA+AMecFXLCm3zsrfGdjT5hW4fvvgDxJxGEZvxOEA0bJT3X11wg@mail.gmail.com> (raw)
In-Reply-To: <20210419151437.GA12999@redsun51.ssa.fujisawa.hgst.com>

On Mon, Apr 19, 2021 at 8:14 AM Keith Busch <kbusch@kernel.org> wrote:
>
> On Mon, Apr 19, 2021 at 09:16:05AM +0200, Christoph Hellwig wrote:
> > On Sat, Apr 17, 2021 at 02:17:35AM +0900, Keith Busch wrote:
> > > On Fri, Apr 16, 2021 at 10:12:11AM -0700, Yuanyuan Zhong wrote:
> > > > >         if (poll)
> > > > >                 nvme_execute_rq_polled(req->q, NULL, req, at_head);
> > > > You may need to audit other completion handlers for blk_execute_rq_nowait().
> > >
> > > Why? Those callers already provide their own callback that directly get
> > > the error.

See below clarification. I was wondering whether the way you were going to
propose for nvme_end_sync_rq() would establish new convention for other
blk_execute_rq_nowait() completion handlers implementation.

> > >
> > > > How to get error ret from polled rq?
> > >
> > > Please see nvme_end_sync_rq() for that driver's polled handler callback.
> > > It already has the error.
> >
> > But it never looks at it..
>
> The question was how to get ret. I didn't mean to imply the example was
> actually using it. :)

The question was how to let nvme_end_sync_rq() propagate the blk_status_t
error to the ret for __nvme_submit_sync_cmd(). That's part of the problem
here: __nvme_submit_sync_cmd() may return success for a command that
failed submission.

-- 
Regards,
Yuanyuan Zhong

  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 16:53 [PATCH 1/2] block: return errors " Keith Busch
2021-04-16 16:53 ` [PATCH 2/2] nvme: use return value " Keith Busch
2021-04-16 17:12   ` Yuanyuan Zhong
2021-04-16 17:17     ` Keith Busch
2021-04-19  7:16       ` Christoph Hellwig
2021-04-19 15:14         ` Keith Busch
2021-04-19 17:27           ` Yuanyuan Zhong [this message]
2021-04-19 17:48             ` Keith Busch
2021-04-19 18:20               ` Yuanyuan Zhong
2021-04-18  4:17   ` Chaitanya Kulkarni
2021-04-18  4:13 ` [PATCH 1/2] block: return errors " Chaitanya Kulkarni
2021-04-17  2:04 [PATCH 2/2] nvme: use return value " Casey Chen
2021-04-17  2:39 ` Keith Busch
2021-04-23 21:57 [PATCH 1/2] block: return errors " Keith Busch
2021-04-23 21:58 ` [PATCH 2/2] nvme: use return value " Keith Busch

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