From: ming.lei@redhat.com (Ming Lei)
Subject: [PATCH 1/6] nvme: Sync request queues on reset
Date: Tue, 22 May 2018 09:56:32 +0800 [thread overview]
Message-ID: <20180522015631.GA20604@ming.t460p> (raw)
In-Reply-To: <20180521162517.GN5528@localhost.localdomain>
On Mon, May 21, 2018@10:25:17AM -0600, Keith Busch wrote:
> On Tue, May 22, 2018@12:08:37AM +0800, Ming Lei wrote:
> > Please take a look at blk_mq_complete_request(). Even with Bart's
> > change, the request still won't be completed by driver. The request can
> > only be completed by either driver or blk-mq, not both.
>
> So you're saying blk-mq can't complete a request the driver returned to
> blk-mq to complete. And that's the nvme driver's problem to fix?
For avoiding use-after-free, one request can only be completed by
one path, either by timeout path or normal completion(irq or cancel)
from driver.
So before handling this req's timeout, this request has to be
marked as completed by blk-mq timeout code already, then nvme_cancel_request()
can't cover this timed-out request.
Thanks,
Ming
prev parent reply other threads:[~2018-05-22 1:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-18 16:38 [PATCH 1/6] nvme: Sync request queues on reset Keith Busch
2018-05-18 16:38 ` [PATCH 2/6] nvme-pci: Fix queue freeze criteria " Keith Busch
2018-05-18 16:38 ` [PATCH 3/6] nvme: Move all IO out of controller reset Keith Busch
2018-05-18 23:03 ` Ming Lei
2018-05-21 14:22 ` Keith Busch
2018-05-21 14:58 ` Ming Lei
2018-05-21 15:03 ` Keith Busch
2018-05-21 15:34 ` Ming Lei
2018-05-21 15:44 ` Keith Busch
2018-05-21 16:04 ` Ming Lei
2018-05-21 16:23 ` Keith Busch
2018-05-22 1:46 ` Ming Lei
2018-05-22 14:03 ` Keith Busch
2018-05-18 16:38 ` [PATCH 4/6] nvme: Allow reset from CONNECTING state Keith Busch
2018-05-18 16:38 ` [PATCH 5/6] nvme-pci: Attempt reset retry for IO failures Keith Busch
2018-05-18 16:38 ` [PATCH 6/6] nvme-pci: Rate limit the nvme timeout warnings Keith Busch
2018-05-18 22:32 ` [PATCH 1/6] nvme: Sync request queues on reset Ming Lei
2018-05-18 23:44 ` Keith Busch
2018-05-19 0:01 ` Ming Lei
2018-05-21 14:04 ` Keith Busch
2018-05-21 15:25 ` Ming Lei
2018-05-21 15:59 ` Keith Busch
2018-05-21 16:08 ` Ming Lei
2018-05-21 16:25 ` Keith Busch
2018-05-22 1:56 ` Ming Lei [this message]
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=20180522015631.GA20604@ming.t460p \
--to=ming.lei@redhat.com \
/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).