[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>

diff --git a/net/atm/lec.c b/net/atm/lec.c
index 29acfb0..c5d1f9e 100644 (file)
--- 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 125df36..ec67435 100644 (file)
--- 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 */
 };
 
 /*