openvswitch: Fix dependency on IPv6 defrag.

When NF_CONNTRACK is built-in, NF_DEFRAG_IPV6 is a module, and
OPENVSWITCH is built-in, the following build error would occur:

net/built-in.o: In function `ovs_ct_execute':
(.text+0x10f587): undefined reference to `nf_ct_frag6_gather'

Fixes: 7f8a436eaa2c ("openvswitch: Add conntrack action")
Reported-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
index 2a071f470d57..d143aa9f6654 100644
--- a/net/openvswitch/Kconfig
+++ b/net/openvswitch/Kconfig
@@ -5,7 +5,8 @@
 config OPENVSWITCH
         tristate "Open vSwitch"
         depends on INET
-        depends on (!NF_CONNTRACK || NF_CONNTRACK)
+        depends on !NF_CONNTRACK || \
+                   (NF_CONNTRACK && (!NF_DEFRAG_IPV6 || NF_DEFRAG_IPV6))
         select LIBCRC32C
         select MPLS
         select NET_MPLS_GSO