From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Mon, 14 Apr 2014 15:11:38 +0000 (+0200)
Subject: ip6_gre: don't allow to remove the fb_tunnel_dev
X-Git-Tag: omap-for-v3.16/pm-signed~106^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=54d63f787b652755e66eb4dd8892ee6d3f5197fc;p=pandora-kernel.git

ip6_gre: don't allow to remove the fb_tunnel_dev

It's possible to remove the FB tunnel with the command 'ip link del ip6gre0' but
this is unsafe, the module always supposes that this device exists. For example,
ip6gre_tunnel_lookup() may use it unconditionally.

Let's add a rtnl handler for dellink, which will never remove the FB tunnel (we
let ip6gre_destroy_tunnels() do the job).

Introduced by commit c12b395a4664 ("gre: Support GRE over IPv6").

CC: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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