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[IPV6] lockdep: annotate __icmpv6_socket

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Split off __icmpv6_socket's sk->sk_dst_lock class, because it gets
used from softirqs, which is safe for __icmpv6_sockets (because they
never get directly used via userspace syscalls), but unsafe for normal
sockets.

Has no effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ingo Molnar 2006-08-15 00:06:56 -07:00 committed by David S. Miller
parent deb47c66e1
commit 640c41c77a
1 changed files with 13 additions and 0 deletions
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13
net/ipv6/icmp.c
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@ -712,6 +712,11 @@ static int icmpv6_rcv(struct sk_buff **pskb)
return 0;
}
/*
* Special lock-class for __icmpv6_socket:
*/
static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
int __init icmpv6_init(struct net_proto_family *ops)
{
struct sock *sk;
@ -730,6 +735,14 @@ int __init icmpv6_init(struct net_proto_family *ops)
sk = per_cpu(__icmpv6_socket, i)->sk;
sk->sk_allocation = GFP_ATOMIC;
/*
* Split off their lock-class, because sk->sk_dst_lock
* gets used from softirqs, which is safe for
* __icmpv6_socket (because those never get directly used
* via userspace syscalls), but unsafe for normal sockets.
*/
lockdep_set_class(&sk->sk_dst_lock,
&icmpv6_socket_sk_dst_lock_key);
/* Enough space for 2 64K ICMP packets, including
* sk_buff struct overhead.