netdev - Re: [PATCH] virtio_net: enable tx after resuming from suspend

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Message-ID: <dd530053-efab-b661-3423-1faaab8fb12f@redhat.com>
Date:   Thu, 11 Oct 2018 17:44:01 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Ake Koomsin <ake@...l.co.jp>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_net: enable tx after resuming from suspend



On 2018年10月11日 15:51, Ake Koomsin wrote:
> commit 713a98d90c5e ("virtio-net: serialize tx routine during reset")
> disabled the virtio tx before going to suspend to avoid a use after free.
> However, after resuming, it causes the virtio_net device to lose its
> network connectivity.
>
> To solve the issue, we need to enable tx after resuming.
>
> Fixes commit 713a98d90c5e ("virtio-net: serialize tx routine during reset")
> Signed-off-by: Ake Koomsin <ake@...l.co.jp>
> ---
>   drivers/net/virtio_net.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index dab504ec5e50..3453d80f5f81 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2256,6 +2256,7 @@ static int virtnet_restore_up(struct virtio_device *vdev)
>   	}
>   
>   	netif_device_attach(vi->dev);
> +	netif_start_queue(vi->dev);

I believe this is duplicated with netif_tx_wake_all_queues() in 
netif_device_attach() above?

Thanks

>   	return err;
>   }
>