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authorDongdong Deng <dongdong.deng@windriver.com>2009-08-23 22:49:07 -0400
committerDavid S. Miller <davem@davemloft.net>2009-08-23 22:51:03 -0400
commit4871953c0ef2cafeb37bbe186d9d13dcb24fc2c5 (patch)
treee272c3a7aeb61a40f3ec807e2b4c8001ed837a7b /drivers/net/ixp2000
parent79b1bee888d43b14cf0c08fb8e5aa6cb161e48f8 (diff)
drivers/net: fixed drivers that support netpoll use ndo_start_xmit()
The NETPOLL API requires that interrupts remain disabled in netpoll_send_skb(). The use of "A functions set" in the NETPOLL API callbacks causes the interrupts to get enabled and can lead to kernel instability. The solution is to use "B functions set" to prevent the irqs from getting enabled while in netpoll_send_skb(). A functions set: local_irq_disable()/local_irq_enable() spin_lock_irq()/spin_unlock_irq() spin_trylock_irq()/spin_unlock_irq() B functions set: local_irq_save()/local_irq_restore() spin_lock_irqsave()/spin_unlock_irqrestore() spin_trylock_irqsave()/spin_unlock_irqrestore() Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com> Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ixp2000')
-rw-r--r--drivers/net/ixp2000/ixpdev.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/ixp2000/ixpdev.c b/drivers/net/ixp2000/ixpdev.c
index 2a0174b62e96..92fb8235c766 100644
--- a/drivers/net/ixp2000/ixpdev.c
+++ b/drivers/net/ixp2000/ixpdev.c
@@ -41,6 +41,7 @@ static int ixpdev_xmit(struct sk_buff *skb, struct net_device *dev)
41 struct ixpdev_priv *ip = netdev_priv(dev); 41 struct ixpdev_priv *ip = netdev_priv(dev);
42 struct ixpdev_tx_desc *desc; 42 struct ixpdev_tx_desc *desc;
43 int entry; 43 int entry;
44 unsigned long flags;
44 45
45 if (unlikely(skb->len > PAGE_SIZE)) { 46 if (unlikely(skb->len > PAGE_SIZE)) {
46 /* @@@ Count drops. */ 47 /* @@@ Count drops. */
@@ -63,11 +64,11 @@ static int ixpdev_xmit(struct sk_buff *skb, struct net_device *dev)
63 64
64 dev->trans_start = jiffies; 65 dev->trans_start = jiffies;
65 66
66 local_irq_disable(); 67 local_irq_save(flags);
67 ip->tx_queue_entries++; 68 ip->tx_queue_entries++;
68 if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN) 69 if (ip->tx_queue_entries == TX_BUF_COUNT_PER_CHAN)
69 netif_stop_queue(dev); 70 netif_stop_queue(dev);
70 local_irq_enable(); 71 local_irq_restore(flags);
71 72
72 return 0; 73 return 0;
73} 74}