Le mercredi 01 décembre 2010 à 12:21 +0100, Eric Dumazet a écrit :

quoted text
> Same here. RTNL is held. Please use __in_dev_get_rtnl()

By the way we can use rtnl_dereference() in __in_dev_get_rtnl()

[PATCH net-next-2.6] : __in_dev_get_rtnl() can use rtnl_dereference()

If caller holds RTNL, we dont need a memory barrier
(smp_read_barrier_depends) included in rcu_dereference().

Just use rtnl_dereference() to properly document the assertions.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
 include/linux/inetdevice.h |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index 2b86eaf..ae8fdc5 100644
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -222,7 +222,7 @@ static inline struct in_device *in_dev_get(const struct net_device *dev)
 
 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
 {
-	return rcu_dereference_check(dev->ip_ptr, lockdep_rtnl_is_held());
+	return rtnl_dereference(dev->ip_ptr);
 }
 
 extern void in_dev_finish_destroy(struct in_device *idev);


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