From: Daniel Wagner <dwagner@suse.de>
To: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>, Keith Busch <kbusch@kernel.org>,
James Smart <james.smart@broadcom.com>,
linux-nvme@lists.infradead.org
Subject: Re: [PATCH 3/3] nvme: allocate the keep alive request using BLK_MQ_REQ_NOWAIT
Date: Wed, 3 Mar 2021 22:00:12 +0100 [thread overview]
Message-ID: <20210303210012.deorolbbpazpwiqd@beryllium.lan> (raw)
In-Reply-To: <20210303125304.1200789-4-hch@lst.de>
On Wed, Mar 03, 2021 at 01:53:04PM +0100, Christoph Hellwig wrote:
> To avoid an error recovery deadlock where the keep alive work is waiting
> for a request and thus can't be flushed to make progress for tearing down
> the controller. Also print the error code returned from
> blk_mq_alloc_request to help debugging any future issues in this code.
>
> Based on an earlier patch from Hannes Reinecke <hare@suse.de>.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
And for what's worth, our customer tested this. I've done the same patch
during debugging. It fixes the deadlock as Hannes reported.
_______________________________________________
Linux-nvme mailing list
Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2021-03-04 1:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-03 12:53 reserved tag allocation fixups Christoph Hellwig
2021-03-03 12:53 ` [PATCH 1/3] nvme-fabrics: only reserve a single tag Christoph Hellwig
2021-03-03 21:03 ` Daniel Wagner
2021-03-03 21:26 ` Chaitanya Kulkarni
2021-03-04 7:02 ` Hannes Reinecke
2021-03-05 20:51 ` Sagi Grimberg
2021-03-06 7:09 ` Christoph Hellwig
2021-03-15 17:12 ` Sagi Grimberg
2021-03-03 12:53 ` [PATCH 2/3] nvme: merge nvme_keep_alive into nvme_keep_alive_work Christoph Hellwig
2021-03-03 21:01 ` Daniel Wagner
2021-03-03 21:24 ` Chaitanya Kulkarni
2021-03-03 21:53 ` Chaitanya Kulkarni
2021-03-04 7:02 ` Hannes Reinecke
2021-03-15 17:13 ` Sagi Grimberg
2021-03-03 12:53 ` [PATCH 3/3] nvme: allocate the keep alive request using BLK_MQ_REQ_NOWAIT Christoph Hellwig
2021-03-03 21:00 ` Daniel Wagner [this message]
2021-03-03 21:22 ` Chaitanya Kulkarni
2021-03-04 7:03 ` Hannes Reinecke
2021-03-15 17:13 ` Sagi Grimberg
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210303210012.deorolbbpazpwiqd@beryllium.lan \
--to=dwagner@suse.de \
--cc=hch@lst.de \
--cc=james.smart@broadcom.com \
--cc=kbusch@kernel.org \
--cc=linux-nvme@lists.infradead.org \
--cc=sagi@grimberg.me \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).