提交 21380b81 编写于 作者: H Herbert Xu 提交者: David S. Miller

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

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: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 85259878
......@@ -403,6 +403,11 @@ unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short f
extern void __xfrm_state_destroy(struct xfrm_state *);
static inline void __xfrm_state_put(struct xfrm_state *x)
{
atomic_dec(&x->refcnt);
}
static inline void xfrm_state_put(struct xfrm_state *x)
{
if (atomic_dec_and_test(&x->refcnt))
......
......@@ -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;
}
......
......@@ -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;
}
......
......@@ -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;
}
......
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