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Message-ID: <20140826141350.GA2036@ada>
Date: Tue, 26 Aug 2014 17:13:50 +0300
From: Andreea-Cristina Bernat <bernat.ada@...il.com>
To: davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: paulmck@...ux.vnet.ibm.com
Subject: [PATCH] ipv6: ip6_gre: Replace rcu_assign_pointer() with
RCU_INIT_POINTER()
According to RCU_INIT_POINTER()'s block comment 3.a, it can be used if
"3. The referenced data structure has already been exposed to readers either
at compile time or via rcu_assign_pointer() -and-
a. You have not made -any- reader-visible changes to this structure since
then".
This case fulfills the conditions above because between the rtnl_dereference()
call and the rcu_assign_pointer() call there is no update of that value.
Therefore, this patch makes the replacement.
The following Coccinelle semantic patch was used:
@@
@@
- rcu_assign_pointer
+ RCU_INIT_POINTER
(...,
(
rtnl_dereference(...)
|
rcu_dereference_protected(...)
) )
Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
---
net/ipv6/ip6_gre.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 3873181..67dcaca 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -261,7 +261,7 @@ static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
{
struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
- rcu_assign_pointer(t->next, rtnl_dereference(*tp));
+ RCU_INIT_POINTER(t->next, rtnl_dereference(*tp));
rcu_assign_pointer(*tp, t);
}
--
1.9.1
--
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