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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-04-27 06:22:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-27 12:39:01 -0700 |
| commit | 7ec75c582e639d956ce3afd499f67febe6f902a4 (patch) | |
| tree | 4752d1cc90ab385797d526cb901e42f27e3b20f6 /include/net/inet_timewait_sock.h | |
| parent | d4c4f07df16c767b8efbc44e7cdf795fac326b33 (diff) | |
| download | lwn-7ec75c582e639d956ce3afd499f67febe6f902a4.tar.gz lwn-7ec75c582e639d956ce3afd499f67febe6f902a4.zip | |
net: suppress RCU lockdep false positive in twsk_net()
Calls to twsk_net() are in some cases protected by reference counting
as an alternative to RCU protection. Cases covered by reference counts
include __inet_twsk_kill(), inet_twsk_free(), inet_twdr_do_twkill_work(),
inet_twdr_twcal_tick(), and tcp_timewait_state_process(). RCU is used
by inet_twsk_purge(). Locking is used by established_get_first()
and established_get_next(). Finally, __inet_twsk_hashdance() is an
initialization case.
It appears to be non-trivial to locate the appropriate locks and
reference counts from within twsk_net(), so used rcu_dereference_raw().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_timewait_sock.h')
| -rw-r--r-- | include/net/inet_timewait_sock.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h index 79f67eae8a7e..a066fdd50da6 100644 --- a/include/net/inet_timewait_sock.h +++ b/include/net/inet_timewait_sock.h @@ -224,7 +224,9 @@ static inline struct net *twsk_net(const struct inet_timewait_sock *twsk) { #ifdef CONFIG_NET_NS - return rcu_dereference(twsk->tw_net); + return rcu_dereference_raw(twsk->tw_net); /* protected by locking, */ + /* reference counting, */ + /* initialization, or RCU. */ #else return &init_net; #endif |