linux-kernel - Re: [PATCH net] virtio-net: correctly handle cpu hotplug notifier during resuming

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Date:	Tue, 29 Oct 2013 22:44:56 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, gaowanlong@...fujitsu.com
Subject: Re: [PATCH net] virtio-net: correctly handle cpu hotplug notifier
 during resuming

From: Jason Wang <jasowang@...hat.com>
Date: Tue, 29 Oct 2013 15:11:07 +0800

> commit 3ab098df35f8b98b6553edc2e40234af512ba877 (virtio-net: don't respond to
> cpu hotplug notifier if we're not ready) tries to bypass the cpu hotplug
> notifier by checking the config_enable and does nothing is it was false. So it
> need to try to hold the config_lock mutex which may happen in atomic
> environment which leads the following warnings:
 ...
> A correct fix is to unregister the hotcpu notifier during restore and register a
> new one in resume.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Tested-by: Fengguang Wu <fengguang.wu@...el.com>
> Cc: Wanlong Gao <gaowanlong@...fujitsu.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
> This patch is needed for 3.8 and above.

Applied and queued up for -stable, thanks Jason.
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