linux-kernel - Re: [PATCH v4 09/12] virtio: net: Add freeze, restore handlers to support S4

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Date:	Wed, 7 Dec 2011 12:28:24 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	Virtualization List <virtualization@...ts.linux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>, levinsasha928@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 09/12] virtio: net: Add freeze, restore handlers to
 support S4

On Wed, Dec 07, 2011 at 01:18:47AM +0530, Amit Shah wrote:
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 697a0fc..1378f3c 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1151,6 +1151,38 @@ static void __devexit virtnet_remove(struct virtio_device *vdev)
>  	free_netdev(vi->dev);
>  }
>  
> +#ifdef CONFIG_PM
> +static int virtnet_freeze(struct virtio_device *vdev)
> +{
> +	struct virtnet_info *vi = vdev->priv;
> +
> +	netif_device_detach(vi->dev);
> +	if (netif_running(vi->dev))
> +		napi_disable(&vi->napi);
> +

Could refill_work still be running at this point?
If yes it can re-enable napi and cause other kind of trouble.

> +	remove_vq_common(vi);
> +
> +	return 0;
> +}
--
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