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Date:   Sun, 14 Jul 2019 07:58:19 -0600
From:   David Ahern <dsahern@...il.com>
To:     Lorenzo Bianconi <lorenzo.bianconi@...hat.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, marek@...udflare.com
Subject: Re: [PATCH net v2] net: neigh: fix multiple neigh timer scheduling

On 7/14/19 2:45 AM, Lorenzo Bianconi wrote:
> @@ -1124,7 +1125,9 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
>  
>  			atomic_set(&neigh->probes,
>  				   NEIGH_VAR(neigh->parms, UCAST_PROBES));
> -			neigh->nud_state     = NUD_INCOMPLETE;
> +			if (check_timer)
> +				neigh_del_timer(neigh);

Why not just always call neigh_del_timer and avoid the check_timer flag?
Let the NUD_IN_TIMER flag handle whether anything needs to be done.

> +			neigh->nud_state = NUD_INCOMPLETE;
>  			neigh->updated = now;
>  			next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME),
>  					 HZ/2);
> @@ -1140,6 +1143,8 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
>  		}
>  	} else if (neigh->nud_state & NUD_STALE) {
>  		neigh_dbg(2, "neigh %p is delayed\n", neigh);
> +		if (check_timer)
> +			neigh_del_timer(neigh);
>  		neigh->nud_state = NUD_DELAY;
>  		neigh->updated = jiffies;
>  		neigh_add_timer(neigh, jiffies +

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