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xfrm: policy: xfrm_policy_unregister_afinfo can return void

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Nothing checks the return value. Also, the errors returned on unregister
are impossible (we only support INET and INET6, so no way
xfrm_policy_afinfo[afinfo->family] can be anything other than 'afinfo'
itself).

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2017-02-07 15:00:15 +01:00 committed by Steffen Klassert
parent f5e2bb4f5b
commit 2b61997aa0
2 changed files with 14 additions and 23 deletions
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2
include/net/xfrm.h
View file

@ -304,7 +304,7 @@ struct xfrm_policy_afinfo {
};
int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
void xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
void km_policy_notify(struct xfrm_policy *xp, int dir,
const struct km_event *c);
void km_state_notify(struct xfrm_state *x, const struct km_event *c);

21
net/xfrm/xfrm_policy.c
View file

@ -2883,24 +2883,17 @@ int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
}
EXPORT_SYMBOL(xfrm_policy_register_afinfo);
int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
void xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
{
int err = 0;
if (unlikely(afinfo == NULL))
return -EINVAL;
struct dst_ops *dst_ops = afinfo->dst_ops;
if (unlikely(afinfo->family >= NPROTO))
return -EAFNOSUPPORT;
spin_lock(&xfrm_policy_afinfo_lock);
if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
err = -EINVAL;
else
return;
if (likely(xfrm_policy_afinfo[afinfo->family] != afinfo)) {
RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
NULL);
}
spin_unlock(&xfrm_policy_afinfo_lock);
if (!err) {
struct dst_ops *dst_ops = afinfo->dst_ops;
synchronize_rcu();
@ -2909,8 +2902,6 @@ int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
dst_ops->negative_advice = NULL;
dst_ops->link_failure = NULL;
afinfo->garbage_collect = NULL;
}
return err;
}
EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);