From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Tue, 27 Apr 2010 06:22:01 +0000 (+0000)
Subject: net: suppress RCU lockdep false positive in twsk_net()
X-Git-Tag: v2.6.35-rc1~473^2~378
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ec75c582e639d956ce3afd499f67febe6f902a4;p=pandora-kernel.git

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>
---

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