From 6720b35b8186e9c6a9f137c02f8c2c1e7c98085f Mon Sep 17 00:00:00 2001
From: Pierre Riteau <Pierre.Riteau@irisa.fr>
Date: Wed, 25 Nov 2009 18:49:34 +0000
Subject: net: fix TAP networking on host kernels without IFF_VNET_HDR support

vnet_hdr is initialized at 1 by default. We need to reset it to 0 if
the kernel doesn't support IFF_VNET_HDR.

Signed-off-by: Pierre Riteau <Pierre.Riteau@irisa.fr>
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 net/tap-linux.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'net')

diff --git a/net/tap-linux.c b/net/tap-linux.c
index 0f621a231..e4f7e2723 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -52,6 +52,8 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
             features & IFF_VNET_HDR) {
             *vnet_hdr = 1;
             ifr.ifr_flags |= IFF_VNET_HDR;
+        } else {
+            *vnet_hdr = 0;
         }
 
         if (vnet_hdr_required && !*vnet_hdr) {
-- 
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