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Commit 9ff56607 authored by David S. Miller's avatar David S. Miller
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Revert "[NDISC]: Fix race in generic address resolution" 



This reverts commit 69cc64d8.

It causes recursive locking in IPV6 because unlike other
neighbour layer clients, it even needs neighbour cache
entries to send neighbour soliciation messages :-(

We'll have to find another way to fix this race.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 93b2d4a2

net/core/neighbour.c

+9 −3
Original line number Diff line number Diff line
@@ -834,12 +834,18 @@ static void neigh_timer_handler(unsigned long arg) 
	}

	if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) {

		struct sk_buff *skb = skb_peek(&neigh->arp_queue);



		/* keep skb alive even if arp_queue overflows */

		if (skb)

			skb_get(skb);

		write_unlock(&neigh->lock);

		neigh->ops->solicit(neigh, skb);

		atomic_inc(&neigh->probes);

	}

		if (skb)

			kfree_skb(skb);

	} else {

out:

		write_unlock(&neigh->lock);

	}



	if (notify)

		neigh_update_notify(neigh);

net/ipv4/arp.c

+3 −0
Original line number Diff line number Diff line
@@ -368,6 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) 
		if (!(neigh->nud_state&NUD_VALID))

			printk(KERN_DEBUG "trying to ucast probe in NUD_INVALID\n");

		dst_ha = neigh->ha;

		read_lock_bh(&neigh->lock);

	} else if ((probes -= neigh->parms->app_probes) < 0) {

#ifdef CONFIG_ARPD

		neigh_app_ns(neigh);
@@ -377,6 +378,8 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) 


	arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr,

		 dst_ha, dev->dev_addr, NULL);

	if (dst_ha)

		read_unlock_bh(&neigh->lock);

}



static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip)