From: Wei Liu <wei.liu2@citrix.com>
Date: Thu, 16 May 2013 23:26:11 +0000 (+0000)
Subject: xen-netback: enable user to unload netback module
X-Git-Tag: v3.11-rc1~16^2~388
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b103f358d9f6f58658f1a6dc08912ab921dd86f1;p=pandora-kernel.git

xen-netback: enable user to unload netback module

This patch enables user to unload netback module, which is useful when user
wants to upgrade to a newer netback module without rebooting the host.

Netfront cannot handle netback removal event. As we cannot fix all possible
frontends we add module get / put along with vif get / put to avoid
mis-unloading of netback. To unload netback module, user needs to shutdown all
VMs or migrate them to another host or unplug all vifs before hand.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>¬
Signed-off-by: David S. Miller <davem@davemloft.net>
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