netdev - Re: [PATCH RFC net-next] arp: Really delete an arp entry on "arp -d"

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Date:   Tue, 30 May 2017 16:20:20 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH RFC net-next] arp: Really delete an arp entry on "arp
 -d"

On Mon, 29 May 2017 20:48:16 -0700
Sowmini Varadhan <sowmini.varadhan@...cle.com> wrote:

> +	np = &nht->hash_buckets[hash_val];
> +	while ((n = rcu_dereference_protected(*np,
> +				lockdep_is_held(&tbl->lock))) != NULL) {
> +		write_lock(&n->lock);
> +		if (n == ndel) {
> +			bool retval = false;
> +
> +			if  (atomic_read(&n->refcnt) == 1) {
> +				rcu_assign_pointer(*np,
> +					rcu_dereference_protected(n->next,
> +					lockdep_is_held(&tbl->lock)));
> +				n->dead = 1;
> +				retval = true;
> +			}
> +			write_unlock(&n->lock);
> +			if (retval)
> +				neigh_cleanup_and_release(n);
> +			write_unlock_bh(&tbl->lock);
> +			return retval;
> +		}
> +		write_unlock(&n->lock);
> +		np = &n->next;
> +	}
> +

Please don't copy/paste chunks of code. Instead refactor and make this
into a helper function.