netdev - Re: [PATCH take 2] pkt_sched: Fix qdisc_watchdog() vs. dev

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Message-ID: <20080911115449.GA22860@gondor.apana.org.au>
Date:	Thu, 11 Sep 2008 21:54:49 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH take 2] pkt_sched: Fix qdisc_watchdog() vs.
	dev_deactivate() race

On Thu, Sep 11, 2008 at 11:51:32AM +0000, Jarek Poplawski wrote:
> 
> IMHO, the most reasonable test here is for all tx_queues of a qdisc
> beeing stopped, but since this is quite heavy, probably we need an
> additional qdisc flag for such an occasion.

Yes we could do that too.  Although the head-of-qdisc approach
will eventually lead to the same result.  That is, as you pop
things off the head eventually you'll hit a packet that belongs
to the stopped queue and that'll then block the whole qdisc.

So I don't think there's anything inherently advantageous in
checking all the queues.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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