From: Eric Dumazet <dada1@cosmosbay.com>
Date: Fri, 18 Jan 2008 11:31:36 +0000 (-0800)
Subject: [FIB]: Fix rcu_dereference() abuses in fib_trie.c
X-Git-Tag: v2.6.25-rc1~1162^2~700
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b59cfbf77dc8368c2c90b012c79553613f4d70c3;p=pandora-kernel.git

[FIB]: Fix rcu_dereference() abuses in fib_trie.c

node_parent() and tnode_get_child() currently use rcu_dereference().

These functions are called from both
- readers only paths (where rcu_dereference() is needed), and
- writer path (where rcu_dereference() is not needed)

To make explicit where rcu_dereference() is really needed, I
introduced new node_parent_rcu() and tnode_get_child_rcu() functions
which use rcu_dereference(), while node_parent() and tnode_get_child()
dont use it.

Then I changed calling sites where rcu_dereference() was really needed
to call the _rcu() variants.

This should have no impact but for alpha architecture, and may help
future sparse checks.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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