net: suppress RCU lockdep false positive in twsk_net()
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Tue, 27 Apr 2010 06:22:01 +0000 (06:22 +0000)
committerDavid S. Miller <davem@davemloft.net>
Tue, 27 Apr 2010 19:39:01 +0000 (12:39 -0700)
commit7ec75c582e639d956ce3afd499f67febe6f902a4
tree4752d1cc90ab385797d526cb901e42f27e3b20f6
parentd4c4f07df16c767b8efbc44e7cdf795fac326b33
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>
include/net/inet_timewait_sock.h