Linux-NVME Archive on lore.kernel.org
 help / color / mirror / Atom feed
From: keith.busch@intel.com (Keith Busch)
Subject: Bug report - drivers/nvme/host/pci.c?
Date: Wed, 3 Jan 2018 13:01:41 -0700	[thread overview]
Message-ID: <20180103200140.GA11172@localhost.localdomain> (raw)
In-Reply-To: <BY2PR04MB2101903E77826A0479550572861E0@BY2PR04MB2101.namprd04.prod.outlook.com>

On Wed, Jan 03, 2018@07:46:05PM +0000, Chaitanya Kulkarni wrote:
>    HI Fangjian,
> 
>    I ran your test on the latest kernel and I did not see the problem.
<> 
>    Is there a particular reason why you are using Linux version 4.15.0-rc1?
> 
>    Can you please check if you are having the same problem on the latest
>    kernel as mentioned in my log?
> 
>    Regards,
> 
>    Chaitanya

I would guess the reporter has an IOMMU enabled that DMA maps into fewer
entries than the virtual table has. Since that's possible, I think the
WARN_ON is invalid unless you overwrite iod->nents to be the return of
dma_map_sg, I think.

  parent reply	other threads:[~2018-01-03 20:01 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-03  6:31 Bug report - drivers/nvme/host/pci.c? Fangjian (Turing)
     [not found] ` <BY2PR04MB2101903E77826A0479550572861E0@BY2PR04MB2101.namprd04.prod.outlook.com>
2018-01-03 20:01   ` Keith Busch [this message]
2018-01-03 20:11     ` Keith Busch
2018-01-08  9:49       ` hch
2018-01-10 21:59         ` Keith Busch
     [not found] ` <BY2PR04MB21010125E9B1334D2FA505E786130@BY2PR04MB2101.namprd04.prod.outlook.com>
2018-01-08  9:47   ` hch

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=20180103200140.GA11172@localhost.localdomain \
    --to=keith.busch@intel.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