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authorChas Williams <chas@cmf.nrl.navy.mil>2006-09-29 17:16:48 -0700
committerDavid S. Miller <davem@davemloft.net>2006-09-29 17:16:48 -0700
commit33a9c2d4b758279c5077fc15d221b385a574ae0b (patch)
treeadcaad67bd057b2d8200bae2219710c920c586f5 /net/atm
parent987e46bdf314c55e060570ff46723d770e461f0e (diff)
downloadlinux-33a9c2d4b758279c5077fc15d221b385a574ae0b.tar.gz
[ATM]: [lec] add reference counting to lec_arp entries
Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/atm')
-rw-r--r--net/atm/lec.c42
-rw-r--r--net/atm/lec_arpc.h1
2 files changed, 29 insertions, 14 deletions
diff --git a/net/atm/lec.c b/net/atm/lec.c
index 29acfb0e6d0..c5d1f9e9a64 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -107,6 +107,19 @@ static void lec_vcc_added(struct lec_priv *priv, struct atmlec_ioc *ioc_data,
struct sk_buff *skb));
static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
+/* must be done under lec_arp_lock */
+static inline void lec_arp_hold(struct lec_arp_table *entry)
+{
+ atomic_inc(&entry->usage);
+}
+
+static inline void lec_arp_put(struct lec_arp_table *entry)
+{
+ if (atomic_dec_and_test(&entry->usage))
+ kfree(entry);
+}
+
+
static struct lane2_ops lane2_ops = {
lane2_resolve, /* resolve, spec 3.1.3 */
lane2_associate_req, /* associate_req, spec 3.1.4 */
@@ -795,7 +808,7 @@ static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
entry = lec_arp_find(priv, src);
if (entry && entry->vcc != vcc) {
lec_arp_remove(priv, entry);
- kfree(entry);
+ lec_arp_put(entry);
}
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
@@ -1726,7 +1739,7 @@ static void lec_arp_destroy(struct lec_priv *priv)
for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
lec_arp_remove(priv, entry);
- kfree(entry);
+ lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
}
@@ -1735,7 +1748,7 @@ static void lec_arp_destroy(struct lec_priv *priv)
del_timer_sync(&entry->timer);
lec_arp_clear_vccs(entry);
hlist_del(&entry->next);
- kfree(entry);
+ lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
@@ -1743,7 +1756,7 @@ static void lec_arp_destroy(struct lec_priv *priv)
del_timer_sync(&entry->timer);
lec_arp_clear_vccs(entry);
hlist_del(&entry->next);
- kfree(entry);
+ lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->lec_no_forward);
@@ -1751,7 +1764,7 @@ static void lec_arp_destroy(struct lec_priv *priv)
/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
lec_arp_clear_vccs(entry);
hlist_del(&entry->next);
- kfree(entry);
+ lec_arp_put(entry);
}
INIT_HLIST_HEAD(&priv->mcast_fwds);
priv->mcast_vcc = NULL;
@@ -1799,6 +1812,7 @@ static struct lec_arp_table *make_entry(struct lec_priv *priv,
to_return->last_used = jiffies;
to_return->priv = priv;
skb_queue_head_init(&to_return->tx_wait);
+ atomic_set(&to_return->usage, 1);
return to_return;
}
@@ -1843,7 +1857,7 @@ static void lec_arp_expire_vcc(unsigned long data)
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
lec_arp_clear_vccs(to_remove);
- kfree(to_remove);
+ lec_arp_put(to_remove);
}
/*
@@ -1891,7 +1905,7 @@ static void lec_arp_check_expire(void *data)
/* Remove entry */
DPRINTK("LEC:Entry timed out\n");
lec_arp_remove(priv, entry);
- kfree(entry);
+ lec_arp_put(entry);
} else {
/* Something else */
if ((entry->status == ESI_VC_PENDING ||
@@ -2045,7 +2059,7 @@ lec_addr_delete(struct lec_priv *priv, unsigned char *atm_addr,
&& (permanent ||
!(entry->flags & LEC_PERMANENT_FLAG))) {
lec_arp_remove(priv, entry);
- kfree(entry);
+ lec_arp_put(entry);
}
spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
return 0;
@@ -2094,7 +2108,7 @@ lec_arp_update(struct lec_priv *priv, unsigned char *mac_addr,
tmp->old_push = entry->old_push;
tmp->last_used = jiffies;
del_timer(&entry->timer);
- kfree(entry);
+ lec_arp_put(entry);
entry = tmp;
} else {
entry->status = ESI_FORWARD_DIRECT;
@@ -2414,7 +2428,7 @@ static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
if (vcc == entry->vcc) {
lec_arp_remove(priv, entry);
- kfree(entry);
+ lec_arp_put(entry);
if (priv->mcast_vcc == vcc) {
priv->mcast_vcc = NULL;
}
@@ -2427,7 +2441,7 @@ static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
lec_arp_clear_vccs(entry);
del_timer(&entry->timer);
hlist_del(&entry->next);
- kfree(entry);
+ lec_arp_put(entry);
}
}
@@ -2436,7 +2450,7 @@ static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
lec_arp_clear_vccs(entry);
del_timer(&entry->timer);
hlist_del(&entry->next);
- kfree(entry);
+ lec_arp_put(entry);
}
}
@@ -2445,7 +2459,7 @@ static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
lec_arp_clear_vccs(entry);
/* No timer, LANEv2 7.1.20 and 2.3.5.3 */
hlist_del(&entry->next);
- kfree(entry);
+ lec_arp_put(entry);
}
}
@@ -2481,7 +2495,7 @@ lec_arp_check_empties(struct lec_priv *priv,
/* We might have got an entry */
if ((tmp = lec_arp_find(priv, src))) {
lec_arp_remove(priv, tmp);
- kfree(tmp);
+ lec_arp_put(tmp);
}
hlist_del(&entry->next);
lec_arp_add(priv, entry);
diff --git a/net/atm/lec_arpc.h b/net/atm/lec_arpc.h
index 125df36d33b..ec67435a40a 100644
--- a/net/atm/lec_arpc.h
+++ b/net/atm/lec_arpc.h
@@ -47,6 +47,7 @@ struct lec_arp_table {
* the length of the tlvs array
*/
struct sk_buff_head tx_wait; /* wait queue for outgoing packets */
+ atomic_t usage; /* usage count */
};
/*