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[IPV4]: Fix BUG() in 2.6.x, udp_poll(), fragments + CONFIG_HIGHMEM

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Steven Hand <Steven.Hand@cl.cam.ac.uk> wrote:
> 
> Reconstructed forward trace: 
> 
>   net/ipv4/udp.c:1334   spin_lock_irq() 
>   net/ipv4/udp.c:1336   udp_checksum_complete() 
> net/core/skbuff.c:1069   skb_shinfo(skb)->nr_frags > 1
> net/core/skbuff.c:1086   kunmap_skb_frag()
> net/core/skbuff.h:1087   local_bh_enable()
> kernel/softirq.c:0140   WARN_ON(irqs_disabled());

The receive queue lock is never taken in IRQs (and should never be) so
we can simply substitute bh for irq.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-05-30 15:50:15 -07:00 committed by David S. Miller
parent 9bb7bc942d
commit 208d89843b
1 changed files with 6 additions and 6 deletions
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12
net/ipv4/udp.c
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@ -738,7 +738,7 @@ int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
unsigned long amount;
amount = 0;
spin_lock_irq(&sk->sk_receive_queue.lock);
spin_lock_bh(&sk->sk_receive_queue.lock);
skb = skb_peek(&sk->sk_receive_queue);
if (skb != NULL) {
/*
@ -748,7 +748,7 @@ int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
*/
amount = skb->len - sizeof(struct udphdr);
}
spin_unlock_irq(&sk->sk_receive_queue.lock);
spin_unlock_bh(&sk->sk_receive_queue.lock);
return put_user(amount, (int __user *)arg);
}
@ -848,12 +848,12 @@ static int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
/* Clear queue. */
if (flags&MSG_PEEK) {
int clear = 0;
spin_lock_irq(&sk->sk_receive_queue.lock);
spin_lock_bh(&sk->sk_receive_queue.lock);
if (skb == skb_peek(&sk->sk_receive_queue)) {
__skb_unlink(skb, &sk->sk_receive_queue);
clear = 1;
}
spin_unlock_irq(&sk->sk_receive_queue.lock);
spin_unlock_bh(&sk->sk_receive_queue.lock);
if (clear)
kfree_skb(skb);
}
@ -1334,7 +1334,7 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
struct sk_buff_head *rcvq = &sk->sk_receive_queue;
struct sk_buff *skb;
spin_lock_irq(&rcvq->lock);
spin_lock_bh(&rcvq->lock);
while ((skb = skb_peek(rcvq)) != NULL) {
if (udp_checksum_complete(skb)) {
UDP_INC_STATS_BH(UDP_MIB_INERRORS);
@ -1345,7 +1345,7 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
break;
}
}
spin_unlock_irq(&rcvq->lock);
spin_unlock_bh(&rcvq->lock);
/* nothing to see, move along */
if (skb == NULL)