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authorChas Williams <chas@cmf.nrl.navy.mil>2006-09-29 17:17:17 -0700
committerDavid S. Miller <davem@davemloft.net>2006-09-29 17:17:17 -0700
commit6656e3c4c8e0c80f2d2bfece574876d269f64861 (patch)
treeb4470a2f0ffd372eb3886a6e344cd336ec430d03 /net
parent33a9c2d4b758279c5077fc15d221b385a574ae0b (diff)
downloadlinux-6656e3c4c8e0c80f2d2bfece574876d269f64861.tar.gz
[ATM]: [lec] use refcnt to protect lec_arp_entries outside lock
Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/atm/lec.c32
1 files changed, 23 insertions, 9 deletions
diff --git a/net/atm/lec.c b/net/atm/lec.c
index c5d1f9e9a64..66c57c1091a 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -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;
}
}
}