[ATM]: [lec] use refcnt to protect lec_arp_entries outside lock
Chas Williams [Sat, 30 Sep 2006 00:17:17 +0000 (17:17 -0700)]
Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/atm/lec.c

index c5d1f9e..66c57c1 100644 (file)
@@ -396,7 +396,7 @@ static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
                        priv->stats.tx_dropped++;
                        dev_kfree_skb(skb);
                }
-               return 0;
+               goto out;
        }
 #if DUMP_PACKETS > 0
        printk("%s:sending to vpi:%d vci:%d\n", dev->name, vcc->vpi, vcc->vci);
@@ -428,6 +428,9 @@ static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
                        netif_wake_queue(dev);
        }
 
+out:
+       if (entry)
+               lec_arp_put(entry);
        dev->trans_start = jiffies;
        return 0;
 }
@@ -1888,6 +1891,7 @@ static void lec_arp_check_expire(void *data)
 
        DPRINTK("lec_arp_check_expire %p\n", priv);
        now = jiffies;
+restart:
        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_tables[i], next) {
@@ -1927,14 +1931,16 @@ static void lec_arp_check_expire(void *data)
                                    time_after_eq(now, entry->timestamp +
                                                  priv->path_switching_delay)) {
                                        struct sk_buff *skb;
+                                       struct atm_vcc *vcc = entry->vcc;
 
-                                       while ((skb =
-                                               skb_dequeue(&entry->tx_wait)) !=
-                                              NULL)
-                                               lec_send(entry->vcc, skb,
-                                                        entry->priv);
+                                       lec_arp_hold(entry);
+                                       spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
+                                       while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
+                                               lec_send(vcc, skb, entry->priv);
                                        entry->last_used = jiffies;
                                        entry->status = ESI_FORWARD_DIRECT;
+                                       lec_arp_put(entry);
+                                       goto restart;
                                }
                        }
                }
@@ -1977,6 +1983,7 @@ static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
                if (entry->status == ESI_FORWARD_DIRECT) {
                        /* Connection Ok */
                        entry->last_used = jiffies;
+                       lec_arp_hold(entry);
                        *ret_entry = entry;
                        found = entry->vcc;
                        goto out;
@@ -2007,6 +2014,7 @@ static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
                 * or BUS flood limit was reached for an entry which is
                 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
                 */
+               lec_arp_hold(entry);
                *ret_entry = entry;
                DPRINTK("lec: entry->status %d entry->vcc %p\n", entry->status,
                        entry->vcc);
@@ -2335,18 +2343,24 @@ static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
        int i;
 
        DPRINTK("LEC:lec_flush_complete %lx\n", tran_id);
+restart:
        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry(entry, node, &priv->lec_arp_tables[i], next) {
                        if (entry->flush_tran_id == tran_id
                            && entry->status == ESI_FLUSH_PENDING) {
                                struct sk_buff *skb;
+                               struct atm_vcc *vcc = entry->vcc;
 
-                               while ((skb =
-                                       skb_dequeue(&entry->tx_wait)) != NULL)
-                                       lec_send(entry->vcc, skb, entry->priv);
+                               lec_arp_hold(entry);
+                               spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
+                               while ((skb = skb_dequeue(&entry->tx_wait)) != NULL)
+                                       lec_send(vcc, skb, entry->priv);
+                               entry->last_used = jiffies;
                                entry->status = ESI_FORWARD_DIRECT;
+                               lec_arp_put(entry);
                                DPRINTK("LEC_ARP: Flushed\n");
+                               goto restart;
                        }
                }
        }