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ipv6: Annotate change of locking mechanism for np->opt 

follows up commit 45f6fad84c ("ipv6: add complete rcu protection around
np->opt") which added mixed rcu/refcount protection to np->opt.

Given the current implementation of rcu_pointer_handoff(), this has no
effect at runtime.

Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin Poirier 2016-02-17 16:20:33 -08:00 committed by David S. Miller
parent f0a404505c
commit e550785c30
1 changed files with 6 additions and 2 deletions
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8
include/net/ipv6.h
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@ -259,8 +259,12 @@ static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
rcu_read_lock();
opt = rcu_dereference(np->opt);
if (opt && !atomic_inc_not_zero(&opt->refcnt))
opt = NULL;
if (opt) {
if (!atomic_inc_not_zero(&opt->refcnt))
opt = NULL;
else
opt = rcu_pointer_handoff(opt);
}
rcu_read_unlock();
return opt;
}