netdev - Re: [PATCH net v2] net: neigh: fix multiple neigh timer scheduling

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Date:   Sun, 14 Jul 2019 22:04:18 +0200
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     David Ahern <dsahern@...il.com>
Cc:     davem@...emloft.net, 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.

ack, I have been too paranoid here. I will post a v3 fixing it.

Regards,
Lorenzo

> 
> > +			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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