[PATCH net] flow_dissect: call init_default_flow_dissectors() earlier

From: Eric Dumazet
Date: Tue Nov 22 2016 - 14:17:37 EST

From: Eric Dumazet <edumazet@xxxxxxxxxx>

Andre Noll reported panics after my recent fix (commit 34fad54c2537
"net: __skb_flow_dissect() must cap its return value")

After some more headaches, Alexander root caused the problem to
init_default_flow_dissectors() being called too late, in case
a network driver like IGB is not a module and receives DHCP message
very early.

Fix is to call init_default_flow_dissectors() much earlier,
as it is a core infrastructure and does not depend on another
kernel service.

Fixes: 06635a35d13d4 ("flow_dissect: use programable dissector in skb_flow_dissect and friends")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reported-by: Andre Noll <maan@xxxxxxxxxxxxxxxx>
Diagnosed-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
net/core/flow_dissector.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 69e4463a4b1b..c6d8207ffa7e 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -1013,4 +1013,4 @@ static int __init init_default_flow_dissectors(void)
return 0;