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[XFRM]: Eliminate refcounting confusion by creating __xfrm_state_put().

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We often just do an atomic_dec(&x->refcnt) on an xfrm_state object
because we know there is more than 1 reference remaining and thus
we can elide the heavier xfrm_state_put() call.

Do this behind an inline function called __xfrm_state_put() so that is
more obvious and also to allow us to more cleanly add refcount
debugging later.

Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Herbert Xu 2006-02-22 14:47:13 -08:00 • committed by David S. Miller
commit 21380b81ef
4 changed files with 11 additions and 6 deletions
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2
net/key/af_key.c
View file

@ -1423,7 +1423,7 @@ static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr,
if (err < 0) {
x->km.state = XFRM_STATE_DEAD;
xfrm_state_put(x);
__xfrm_state_put(x);
goto out;
}

8
net/xfrm/xfrm_state.c
View file

@ -220,14 +220,14 @@ static int __xfrm_state_delete(struct xfrm_state *x)
x->km.state = XFRM_STATE_DEAD;
spin_lock(&xfrm_state_lock);
list_del(&x->bydst);
atomic_dec(&x->refcnt);
__xfrm_state_put(x);
if (x->id.spi) {
list_del(&x->byspi);
atomic_dec(&x->refcnt);
__xfrm_state_put(x);
}
spin_unlock(&xfrm_state_lock);
if (del_timer(&x->timer))
atomic_dec(&x->refcnt);
__xfrm_state_put(x);
/* The number two in this test is the reference
* mentioned in the comment below plus the reference
@ -243,7 +243,7 @@ static int __xfrm_state_delete(struct xfrm_state *x)
* The xfrm_state_alloc call gives a reference, and that
* is what we are dropping here.
*/
atomic_dec(&x->refcnt);
__xfrm_state_put(x);
err = 0;
}

2
net/xfrm/xfrm_user.c
View file

@ -345,7 +345,7 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
if (err < 0) {
x->km.state = XFRM_STATE_DEAD;
xfrm_state_put(x);
__xfrm_state_put(x);
goto out;
}