From 208d89843b7b03978d8e748b8b991c1be81c4f43 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Mon, 30 May 2005 15:50:15 -0700 Subject: [PATCH] [IPV4]: Fix BUG() in 2.6.x, udp_poll(), fragments + CONFIG_HIGHMEM Steven Hand 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 Signed-off-by: David S. Miller --- net/ipv4/udp.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 4a6952e3fee9..7c24e64b443f 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -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 @@ csum_copy_err: /* 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) -- 2.30.2