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Date: Mon, 30 Dec 2013 11:34:40 +0800 From: Jason Wang <jasowang@...hat.com> To: rusty@...tcorp.com.au, mst@...hat.com, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Jason Wang <jasowang@...hat.com>, Amit Shah <amit.shah@...hat.com>, Eric Dumazet <eric.dumazet@...il.com> Subject: [PATCH net] virtio-net: fix refill races during restore During restoring, try_fill_recv() was called with neither napi lock nor napi disabled. This can lead two try_fill_recv() was called in the same time. Fix this by refilling before trying to enable napi. Fixes 0741bcb5584f9e2390ae6261573c4de8314999f2 (virtio: net: Add freeze, restore handlers to support S4). Cc: Amit Shah <amit.shah@...hat.com> Cc: Rusty Russell <rusty@...tcorp.com.au> Cc: Michael S. Tsirkin <mst@...hat.com> Cc: Eric Dumazet <eric.dumazet@...il.com> Signed-off-by: Jason Wang <jasowang@...hat.com> --- drivers/net/virtio_net.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index d208f86..5d77644 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1797,16 +1797,17 @@ static int virtnet_restore(struct virtio_device *vdev) if (err) return err; - if (netif_running(vi->dev)) + if (netif_running(vi->dev)) { + for (i = 0; i < vi->curr_queue_pairs; i++) + if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) + schedule_delayed_work(&vi->refill, 0); + for (i = 0; i < vi->max_queue_pairs; i++) virtnet_napi_enable(&vi->rq[i]); + } netif_device_attach(vi->dev); - for (i = 0; i < vi->curr_queue_pairs; i++) - if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) - schedule_delayed_work(&vi->refill, 0); - mutex_lock(&vi->config_lock); vi->config_enable = true; mutex_unlock(&vi->config_lock); -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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