netdev - Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl

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Message-ID: <20080819103151.GA6408@ff.dom.local>
Date:	Tue, 19 Aug 2008 10:31:51 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().

On Mon, Aug 18, 2008 at 04:47:48PM -0700, David Miller wrote:
> From: Jarek Poplawski <jarkao2@...il.com>
> Date: Mon, 18 Aug 2008 23:29:46 +0200
> 
> > Two little doubts below:
> > 
> > > diff --git a/net/core/dev.c b/net/core/dev.c
> > > index 600bb23..b88f669 100644
> > > --- a/net/core/dev.c
> > > +++ b/net/core/dev.c
> > > @@ -1341,6 +1341,9 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
> > >  
> > >  void __netif_schedule(struct Qdisc *q)
> > >  {
> > > +	if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
> > > +		return;
> > > +
> > 
> > Why I can't see this code in net-2.6? BTW, I guess it should be now
> > moved to the current __netif_reschedule()? 
> 
> I deleted it, it's unnecessary with your "both bits clear" fix
> which I also added.

Herbert was concerned earlier with this:
"What I mean is the extremely unlikely scenario of net_tx_action
always failing on trylock because dev_deactivate has grabbed the
lock to check whether net_tx_action has completed."

So, I guess this could help here.

Jarek P.
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