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Commit a48bd8f6 authored by Rusty Russell's avatar Rusty Russell
Browse files

virtio: flush buffers on open 



Fix bug found by Christian Borntraeger: if the other side fills all
the registered network buffers before we enable NAPI, we will never
get an interrupt.  The simplest fix is to process the input queue once
on open.

Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent e70f2f1b

drivers/net/virtio_net.c

+7 −0
Original line number Diff line number Diff line
@@ -283,6 +283,13 @@ static int virtnet_open(struct net_device *dev) 
	struct virtnet_info *vi = netdev_priv(dev);



	napi_enable(&vi->napi);



	/* If all buffers were filled by other side before we napi_enabled, we

	 * won't get another interrupt, so process any outstanding packets

	 * now.  virtnet_poll wants re-enable the queue, so we disable here. */

	vi->rvq->vq_ops->disable_cb(vi->rvq);

	netif_rx_schedule(vi->dev, &vi->napi);



	return 0;

}