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>
diff --git a/drivers/net/isa-skeleton.c b/drivers/net/isa-skeleton.c
index 73585fd..d12377b 100644
--- a/drivers/net/isa-skeleton.c
+++ b/drivers/net/isa-skeleton.c
@@ -430,7 +430,8 @@
* 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 @@
* 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