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

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Date:	Tue, 12 Aug 2008 23:16:33 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().

From: Jarek Poplawski <jarkao2@...il.com>
Date: Wed, 13 Aug 2008 06:13:17 +0000

> On Tue, Aug 12, 2008 at 10:11:03PM -0700, David Miller wrote:
> > So, just like one of Jarek's patches, we should simply change
> > dev_queue->qdisc into dev_queue->qdisc_sleeping and that should
> > take care of the bulk of the issues.
> > 
> > Shouldn't it?
> 
> If we don't change anything in __netif_schedule() I doubt it's enough.
> And if this old way of waiting for "outstanding qdisc-less" calls was
> really needed we should probably wait for both qdisc and qdisc_sleeping
> then.

I think if we check both RUNNING and SCHED bits, we'll be OK.

> > Hmmm... maybe we have to sample __QDISC_STATE_SCHED too.
> 
> We could probably even think of using this flag napi_disable() way.

Here (in dev_deactivate), ->qdisc is going to now be &noop_qdisc or
similar.  Asynchronous contexts can run into that thing as much as
they want :-)
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