From c18e9cd623b8aa88090615602c3db7f1386a139d Mon Sep 17 00:00:00 2001
From: Amos Kong <akong@redhat.com>
Date: Fri, 18 Apr 2014 13:45:41 +0800
Subject: [PATCH] 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>
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Reading git-format-patch failed