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

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Message-ID: <20080818042731.GA32637@gondor.apana.org.au>
Date:	Mon, 18 Aug 2008 14:27:31 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	jarkao2@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().

On Sun, Aug 17, 2008 at 06:49:21PM -0700, David Miller wrote:
> 
> The test being added to __netif_schedule() is just a reminder that
> we have to address the "both bits clear" case somehow, likely with
> Jarko's patch which I unintentionally reimplemented :)

The patch looks good to me.

> @@ -1790,6 +1793,8 @@ gso:
>  	rcu_read_lock_bh();
>  
>  	txq = dev_pick_tx(dev, skb);
> +
> +resample_qdisc:
>  	q = rcu_dereference(txq->qdisc);
>  
>  #ifdef CONFIG_NET_CLS_ACT
> @@ -1800,6 +1805,11 @@ gso:
>  
>  		spin_lock(root_lock);
>  
> +		if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
> +			spin_unlock(root_lock);
> +			goto resample_qdisc;
> +		}

We could just drop the packet.

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