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gre6: add Kconfig dependency for NET_IPGRE_DEMUX 

The ipv6 gre implementation was cleaned up to share more code
with the ipv4 version, but it can be enabled even when NET_IPGRE_DEMUX
is disabled, resulting in a link error:

net/built-in.o: In function `gre_rcv':
:(.text+0x17f5d0): undefined reference to `gre_parse_header'
ERROR: "gre_parse_header" [net/ipv6/ip6_gre.ko] undefined!

This adds a Kconfig dependency to prevent that now invalid
configuration.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 308edfdf15 ("gre6: Cleanup GREv6 receive path, call common GRE functions")
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2016-05-03 17:19:57 +02:00 committed by David S. Miller
parent b8223bd1c4
commit 8bf42e9e51
1 changed files with 1 additions and 0 deletions
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net/ipv6/Kconfig
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@ -218,6 +218,7 @@ config IPV6_GRE
tristate "IPv6: GRE tunnel"
select IPV6_TUNNEL
select NET_IP_TUNNEL
depends on NET_IPGRE_DEMUX
---help---
Tunneling means encapsulating data of one protocol type within
another protocol and sending it over a channel that understands the