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Message-ID: <20080814081632.GB32475@gondor.apana.org.au>
Date:	Thu, 14 Aug 2008 18:16:32 +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] pkt_sched: Destroy gen estimators under rtnl_lock().

On Thu, Aug 14, 2008 at 07:59:07AM +0000, Jarek Poplawski wrote:
> 
> net: Change handling of the __QDISC_STATE_SCHED flag in net_tx_action().
> 
> Change handling of the __QDISC_STATE_SCHED flag in net_tx_action() to
> enable proper control in dev_deactivate_queue(). Now, if this flag is
> seen as unset under root_lock means a qdisc can't be netif_scheduled.
> 
> 
> Signed-off-by: Jarek Poplawski <jarkao2@...il.com>

Well this probably works in practice but at least on paper it
is vulnerable to live-lock if the net_tx_action side always gets
to the trylock stage and loses to the waiting side.

An aliveness flag would be the safest.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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