Changli Gao wrote:
> static int
> nfqnl_rcv_nl_event(struct notifier_block *this,
> unsigned long event, void *ptr)
> {
> struct netlink_notify *n = ptr;
>
> if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
> int i;
>
> /* destroy all instances for this pid */
> spin_lock(&instances_lock);
> for (i = 0; i < INSTANCE_BUCKETS; i++) {
> struct hlist_node *tmp, *t2;
> struct nfqnl_instance *inst;
> struct hlist_head *head = &instance_table[i];
>
> hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
> if ((n->net == &init_net) &&
> (n->pid == inst->peer_pid))
> __instance_destroy(inst);
> }
> }
> spin_unlock(&instances_lock);
> }
> return NOTIFY_DONE;
> }
>
> static struct notifier_block nfqnl_rtnl_notifier = {
> .notifier_call = nfqnl_rcv_nl_event,
> };
>
Ah, right. So call nfnl_lock() or convert the spinlock to a
mutex.
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