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ip_tunnel: fix preempt warning in ip tunnel creation/updating

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After the commit e09acddf87 ("ip_tunnel: replace dst_cache with generic
implementation"), a preemption debug warning is triggered on ip4
tunnels updating; the dst cache helper needs to be invoked in unpreemptible
context.

We don't need to load the cache on tunnel update, so this commit fixes
the warning replacing the load with a dst cache reset, which is
preempt safe.

Fixes: e09acddf87 ("ip_tunnel: replace dst_cache with generic implementation")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2016-04-28 11:04:51 +02:00 committed by David S. Miller
parent 1dfcd832b1
commit f27337e16f
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/ip_tunnel.c
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@ -326,12 +326,12 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
if (!IS_ERR(rt)) {
tdev = rt->dst.dev;
dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst,
fl4.saddr);
ip_rt_put(rt);
}
if (dev->type != ARPHRD_ETHER)
dev->flags |= IFF_POINTOPOINT;
dst_cache_reset(&tunnel->dst_cache);
}
if (!tdev && tunnel->parms.link)