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

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Date:	Wed, 20 Jan 2016 09:12:23 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Wenbo Wang <mail_weber_wang@....com>
Cc:	keith.busch@...el.com, axboe@...com, linux-kernel@...r.kernel.org,
	linux-nvme@...ts.infradead.org, wenwei.tao@...blaze.com,
	stable@...r.kernel.org, Wenbo Wang <wenbo.wang@...blaze.com>
Subject: Re: [PATH v2] NVMe: init nvme queue before enabling irq

On Wed, Jan 20, 2016 at 05:48:35AM -0500, Wenbo Wang wrote:
> From: Wenbo Wang <wenbo.wang@...blaze.com>
> 
> During reset process, the nvme_dev->bar (ioremapped) may change,
> so nvmeq->q_db shall be also updated by nvme_init_queue().
> 
> Currently nvmeq irq is enabled before queue init, so a spurious
> interrupt triggered nvme_process_cq may access nvmeq->q_db just
> before it is updated, this could cause kernel panic.
> 
> Signed-off-by: Wenbo Wang <wenbo.wang@...blaze.com>
> Reviewed-by: Wenwei Tao <wenwei.tao@...blaze.com>
> ---
>  drivers/nvme/host/pci.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>