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authorDongdong Deng <dongdong.deng@windriver.com>2009-07-12 20:27:06 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-14 12:03:41 -0700
commit79fbe134832ebb70a49d8802cfeb2401dc35bb38 (patch)
tree52e810d78f6357826b83963286b1fcd9d53bd882
parentbc23283c7bc90958927abe26eedc562701743a88 (diff)
drivers/net: using spin_lock_irqsave() in net_send_packet()
spin_unlock_irq() will enable interrupt in net_send_packet(), this patch changes it to spin_lock_irqsave/spin_lock_irqrestore, so that it doesn't enable interrupts when already disabled, and netconsole would work properly over cs89x0/isa-skeleton. Call trace: netconsole write_msg() { ... -> spin_lock_irqsave(); -> netpoll_send_udp() -> netpoll_send_skb() -> net_send_packet() ->... -> spin_unlock_irqrestore(); ... } Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/cs89x0.c7
-rw-r--r--drivers/net/isa-skeleton.c5
2 files changed, 7 insertions, 5 deletions
diff --git a/drivers/net/cs89x0.c b/drivers/net/cs89x0.c
index 3eee666a9cd..55445f980f9 100644
--- a/drivers/net/cs89x0.c
+++ b/drivers/net/cs89x0.c
@@ -1524,6 +1524,7 @@ static void net_timeout(struct net_device *dev)
static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
+ unsigned long flags;
if (net_debug > 3) {
printk("%s: sent %d byte packet of type %x\n",
@@ -1535,7 +1536,7 @@ static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
ask the chip to start transmitting before the
whole packet has been completely uploaded. */
- spin_lock_irq(&lp->lock);
+ spin_lock_irqsave(&lp->lock, flags);
netif_stop_queue(dev);
/* initiate a transmit sequence */
@@ -1549,13 +1550,13 @@ static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
* we're waiting for TxOk, so return 1 and requeue this packet.
*/
- spin_unlock_irq(&lp->lock);
+ spin_unlock_irqrestore(&lp->lock, flags);
if (net_debug) printk("cs89x0: Tx buffer not free!\n");
return NETDEV_TX_BUSY;
}
/* Write the contents of the packet */
writewords(dev->base_addr, TX_FRAME_PORT,skb->data,(skb->len+1) >>1);
- spin_unlock_irq(&lp->lock);
+ spin_unlock_irqrestore(&lp->lock, flags);
lp->stats.tx_bytes += skb->len;
dev->trans_start = jiffies;
dev_kfree_skb (skb);
diff --git a/drivers/net/isa-skeleton.c b/drivers/net/isa-skeleton.c
index 73585fd8f29..d12377b8435 100644
--- a/drivers/net/isa-skeleton.c
+++ b/drivers/net/isa-skeleton.c
@@ -430,7 +430,8 @@ static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
* hardware interrupt handler. Queue flow control is
* thus managed under this lock as well.
*/
- spin_lock_irq(&np->lock);
+ unsigned long flags;
+ spin_lock_irqsave(&np->lock, flags);
add_to_tx_ring(np, skb, length);
dev->trans_start = jiffies;
@@ -446,7 +447,7 @@ static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
* is when the transmit statistics are updated.
*/
- spin_unlock_irq(&np->lock);
+ spin_unlock_irqrestore(&np->lock, flags);
#else
/* This is the case for older hardware which takes
* a single transmit buffer at a time, and it is