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virtio-net: init link state correctly

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For device that supports VIRTIO_NET_F_STATUS, there's no need to
assume the link is up and we need to call nerif_carrier_off() before
querying device status, otherwise we may get wrong operstate after
diver was loaded because the link watch event was not fired as
expected.

For device that does not support VIRITO_NET_F_STATUS, we could not get
its status through virtnet_update_status() and what we can only do is
always assuming the link is up.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2010-11-10 14:45:41 +00:00 committed by David S. Miller
parent 75e6047431
commit 167c25e4c5
1 changed files with 9 additions and 3 deletions
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12
drivers/net/virtio_net.c
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@ -986,9 +986,15 @@ static int virtnet_probe(struct virtio_device *vdev)
goto unregister;
}
vi->status = VIRTIO_NET_S_LINK_UP;
virtnet_update_status(vi);
netif_carrier_on(dev);
/* Assume link up if device can't report link status,
otherwise get link status from config. */
if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
netif_carrier_off(dev);
virtnet_update_status(vi);
} else {
vi->status = VIRTIO_NET_S_LINK_UP;
netif_carrier_on(dev);
}
pr_debug("virtnet: registered device %s\n", dev->name);
return 0;