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ip_tunnel: fix preempt warning in ip tunnel creation/updating

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commit f27337e16f2d0e52a8d05ea599ed13cd266ac291 upstream.

After the commit e09acddf873b ("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: e09acddf873b ("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>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Abeni 2016-04-28 11:04:51 +02:00 • committed by Greg Kroah-Hartman
parent e6454536ad
commit d3bef1e80e
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/ip_tunnel.c
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@ -327,12 +327,12 @@ 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)