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Date:	Tue, 26 Aug 2008 22:57:38 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	jarkao2@...il.com (Jarek Poplawski)
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] pkt_sched: Fix gen_estimator locks

Jarek Poplawski <jarkao2@...il.com> wrote:
> pkt_sched: Fix gen_estimator locks
> 
> While passing a qdisc root lock to gen_new_estimator() and
> gen_replace_estimator() dev could be deactivated or even before
> grafting proper root qdisc as qdisc_sleeping (e.g. qdisc_create),
> so using qdisc_root_lock() is not enough. This patch adds
> qdisc_root_sleeping_lock() for this, plus additional checks, where
> necessary.
> 
> 
> Signed-off-by: Jarek Poplawski <jarkao2@...il.com>

Looks good.

> @@ -830,9 +830,16 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
>                        sch->stab = stab;
>                }
>                if (tca[TCA_RATE]) {
> +                       spinlock_t *root_lock;
> +
> +                       if ((sch->parent != TC_H_ROOT) &&
> +                           !(sch->flags & TCQ_F_INGRESS))
> +                               root_lock = qdisc_root_sleeping_lock(sch);
> +                       else
> +                               root_lock = qdisc_lock(sch);

Another reason why we should just have pointers to the root.

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