linux-kernel - Re: [PATH v2] NVMe: init nvme queue before enabling irq

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Message-ID: <20160512071207.GC25134@c203.arch.suse.de>
Date:	Thu, 12 May 2016 09:12:08 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Keith Busch <keith.busch@...el.com>
Cc:	Wenbo Wang <mail_weber_wang@....com>, axboe@...com,
	stable@...r.kernel.org, wenwei.tao@...blaze.com,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	Wenbo Wang <wenbo.wang@...blaze.com>
Subject: Re: [PATH v2] NVMe: init nvme queue before enabling irq

On Wed, May 11, 2016 at 03:16:33PM -0400, Keith Busch wrote:
> On Wed, May 11, 2016 at 11:25:16AM +0200, Johannes Thumshirn wrote:
> > What ever happened to this patch?
> > I can easily reproduce the bug using
> > while [ true ]; do rmmod nvme nvme_core; modprobe nvme; done
> 
> This patch was supposed to fix using a doorbell between resets when the
> driver had BAR0 unmapped. We don't ever unmap the bar anymore, so this
> patch shouldn't be necessary: the doorbell is already set during queue
> allocation before requset_irq.
> 
> The test doesn't seem like this patch would help either. It sounds
> more like you're hitting somethine else if you don't have this fix:
> 
>   https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git/commit/?h=for-linus&id=9bf2b972afeaffd173fe2ce211ebc555ea7e8a87
> 
> If you do have that fix already, I'd like to see the panic stack trace
> (assuming that's what happened).

Yup, having that commit.

I'm going to reproduce (with current Linus' master) w/o the patch applied
later today.

-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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