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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: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2008-02-04 23:50:07 -05:00
parent e70f2f1bb8
commit a48bd8f670
1 changed files with 7 additions and 0 deletions
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7
drivers/net/virtio_net.c
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@ -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;
}