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virtio_net: zero is an invald queue_pairs number 

Execute "ethtool -L eth0 combined 0" in guest, if multiqueue
is enabled, virtnet_send_command() will return -EINVAL error,
there is a validation in QEMU.

But if multiqueue is disabled, virtnet_set_queues() will just
return zero (success). We should return error for this situation.

Signed-off-by: Amos Kong <akong@redhat.com>
Acked-by:  Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amos Kong 2014-04-18 13:45:41 +08:00 committed by David S. Miller
parent 235a251aba
commit c18e9cd623
1 changed files with 1 additions and 1 deletions
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2
drivers/net/virtio_net.c
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@ -1285,7 +1285,7 @@ static int virtnet_set_channels(struct net_device *dev,
if (channels->rx_count || channels->tx_count || channels->other_count)
return -EINVAL;
if (queue_pairs > vi->max_queue_pairs)
if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
return -EINVAL;
get_online_cpus();