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[IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl

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The following patch renames __in_dev_get() to __in_dev_get_rtnl() and
introduces __in_dev_get_rcu() to cover the second case.

1) RCU with refcnt should use in_dev_get().
2) RCU without refcnt should use __in_dev_get_rcu().
3) All others must hold RTNL and use __in_dev_get_rtnl().

There is one exception in net/ipv4/route.c which is in fact a pre-existing
race condition.  I've marked it as such so that we remember to fix it.

This patch is based on suggestions and prior work by Suzanne Wood and
Paul McKenney.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-10-03 14:35:55 -07:00 • committed by David S. Miller
parent a5e7c210fe
commit e5ed639913
24 changed files with 73 additions and 55 deletions
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12
include/linux/inetdevice.h
View file

@ -142,13 +142,21 @@ static __inline__ int bad_mask(u32 mask, u32 addr)
#define endfor_ifa(in_dev) }
static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
{
struct in_device *in_dev = dev->ip_ptr;
if (in_dev)
in_dev = rcu_dereference(in_dev);
return in_dev;
}
static __inline__ struct in_device *
in_dev_get(const struct net_device *dev)
{
struct in_device *in_dev;
rcu_read_lock();
in_dev = dev->ip_ptr;
in_dev = __in_dev_get_rcu(dev);
if (in_dev)
atomic_inc(&in_dev->refcnt);
rcu_read_unlock();
@ -156,7 +164,7 @@ in_dev_get(const struct net_device *dev)
}
static __inline__ struct in_device *
__in_dev_get(const struct net_device *dev)
__in_dev_get_rtnl(const struct net_device *dev)
{
return (struct in_device*)dev->ip_ptr;
}