From: Keith Busch <email@example.com>
To: Yuanyuan Zhong <firstname.lastname@example.org>
Cc: Christoph Hellwig <email@example.com>,
Subject: Re: [PATCH 2/2] nvme: use return value from blk_execute_rq()
Date: Mon, 19 Apr 2021 10:48:00 -0700 [thread overview]
Message-ID: <20210419174800.GA3130441@dhcp-10-100-145-180.wdc.com> (raw)
On Mon, Apr 19, 2021 at 10:27:42AM -0700, Yuanyuan Zhong wrote:
> On Mon, Apr 19, 2021 at 8:14 AM Keith Busch <firstname.lastname@example.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.
I'm not sure it can be turned into a common pattern. The callbacks are
> > > >
> > > > > 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.
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index b57157106cac..a0fb9ad132af 100644
@@ -949,6 +949,9 @@ static void nvme_end_sync_rq(struct request *rq, blk_status_t error)
struct completion *waiting = rq->end_io_data;
rq->end_io_data = NULL;
+ if (error && !nvme_req(rq)->status)
+ nvme_req(rq)->status = blk_status_to_errno(error);
next prev parent reply other threads:[~2021-04-19 17:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 16:53 [PATCH 1/2] block: return errors from blk_execute_rq() 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
2021-04-19 17:48 ` Keith Busch [this message]
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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