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ipv6: refactor __ipv6_dev_ac_inc() 

Refactor out allocation and initialization and make
the refcount code more readable.

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2014-09-11 15:35:12 -07:00 committed by David S. Miller
parent 013b4d9038
commit 83aa29eefd
1 changed files with 40 additions and 24 deletions
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64
net/ipv6/anycast.c
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@ -203,6 +203,11 @@ void ipv6_sock_ac_close(struct sock *sk)
rtnl_unlock();
}
static void aca_get(struct ifacaddr6 *aca)
{
atomic_inc(&aca->aca_refcnt);
}
static void aca_put(struct ifacaddr6 *ac)
{
if (atomic_dec_and_test(&ac->aca_refcnt)) {
@ -212,6 +217,29 @@ static void aca_put(struct ifacaddr6 *ac)
}
}
static struct ifacaddr6 *aca_alloc(struct rt6_info *rt,
const struct in6_addr *addr)
{
struct inet6_dev *idev = rt->rt6i_idev;
struct ifacaddr6 *aca;
aca = kzalloc(sizeof(*aca), GFP_ATOMIC);
if (aca == NULL)
return NULL;
aca->aca_addr = *addr;
in6_dev_hold(idev);
aca->aca_idev = idev;
aca->aca_rt = rt;
aca->aca_users = 1;
/* aca_tstamp should be updated upon changes */
aca->aca_cstamp = aca->aca_tstamp = jiffies;
atomic_set(&aca->aca_refcnt, 1);
spin_lock_init(&aca->aca_lock);
return aca;
}
/*
* device anycast group inc (add if not found)
*/
@ -223,7 +251,6 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
ASSERT_RTNL();
in6_dev_hold(idev);
write_lock_bh(&idev->lock);
if (idev->dead) {
err = -ENODEV;
@ -238,35 +265,25 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
}
}
/*
* not found: create a new one.
*/
aca = kzalloc(sizeof(struct ifacaddr6), GFP_ATOMIC);
rt = addrconf_dst_alloc(idev, addr, true);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
goto out;
}
aca = aca_alloc(rt, addr);
if (aca == NULL) {
ip6_rt_put(rt);
err = -ENOMEM;
goto out;
}
rt = addrconf_dst_alloc(idev, addr, true);
if (IS_ERR(rt)) {
kfree(aca);
err = PTR_ERR(rt);
goto out;
}
aca->aca_addr = *addr;
aca->aca_idev = idev;
aca->aca_rt = rt;
aca->aca_users = 1;
/* aca_tstamp should be updated upon changes */
aca->aca_cstamp = aca->aca_tstamp = jiffies;
atomic_set(&aca->aca_refcnt, 2);
spin_lock_init(&aca->aca_lock);
aca->aca_next = idev->ac_list;
idev->ac_list = aca;
/* Hold this for addrconf_join_solict() below before we unlock,
* it is already exposed via idev->ac_list.
*/
aca_get(aca);
write_unlock_bh(&idev->lock);
ip6_ins_rt(rt);
@ -277,7 +294,6 @@ int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
return 0;
out:
write_unlock_bh(&idev->lock);
in6_dev_put(idev);
return err;
}