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bridge: Fix RCU race in br_multicast_stop 

Thanks to Paul McKenny for pointing out that it is incorrect to use
synchronize_rcu_bh to ensure that pending callbacks have completed.
Instead we should use rcu_barrier_bh.

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2010-03-05 21:03:35 +00:00 committed by David S. Miller
parent 49f5fcfd4a
commit 10cc2b50eb
1 changed files with 1 additions and 1 deletions
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2
net/bridge/br_multicast.c
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@ -1135,7 +1135,7 @@ void br_multicast_stop(struct net_bridge *br)
if (mdb->old) {
spin_unlock_bh(&br->multicast_lock);
synchronize_rcu_bh();
rcu_barrier_bh();
spin_lock_bh(&br->multicast_lock);
WARN_ON(mdb->old);
}