tree a5d5af4f500099f9a6964241bd11963c027e17bb
parent 40ac17cd56eb5c5a89559ea0fa53f7eea80cbd07
author Markus Armbruster <armbru@redhat.com> 1276258894 +0200
committer Anthony Liguori <aliguori@us.ibm.com> 1276531973 -0500

Make netdev_del delete the netdev even when it's in use

To hot-unplug guest and host part of a network device, you do:

    device_del NIC-ID
    netdev_del NETDEV-ID

For PCI devices, device_del merely tells ACPI to unplug the device.
The device goes away for real only after the guest processed the ACPI
unplug event.

You have to wait until then (e.g. by polling info pci) before you can
unplug the netdev.  Not good.

Fix by removing the "in use" check from do_netdev_del().  Deleting a
netdev while it's in use is safe; packets simply get routed to the bit
bucket.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>