netdev - Re: PROBLEM: kernel lockup while changing TC rules

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Date:	Sat, 03 May 2008 19:26:15 +0200
From:	Jan 'yanek' Bortl <yanek@...bofh.cz>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: PROBLEM: kernel lockup while changing TC rules

Jarek Poplawski wrote:
> ...
> 
> Here is a suspect #1. (BTW, this place reminds me something...)

Great! Seems to solve my problem. I'll do some tests.

Thank you!

> 
> Thanks,
> Jarek P.
> 
> ---
> 
>  net/sched/sch_htb.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
> index 66148cc..5bc1ed4 100644
> --- a/net/sched/sch_htb.c
> +++ b/net/sched/sch_htb.c
> @@ -1197,12 +1197,16 @@ static inline int htb_parent_last_child(struct htb_class *cl)
>  	return 1;
>  }
>  
> -static void htb_parent_to_leaf(struct htb_class *cl, struct Qdisc *new_q)
> +static void htb_parent_to_leaf(struct htb_sched *q, struct htb_class *cl,
> +			       struct Qdisc *new_q)
>  {
>  	struct htb_class *parent = cl->parent;
>  
>  	BUG_TRAP(!cl->level && cl->un.leaf.q && !cl->prio_activity);
>  
> +	if (parent->cmode != HTB_CAN_SEND)
> +		htb_safe_rb_erase(&parent->pq_node, q->wait_pq + parent->level);
> +
>  	parent->level = 0;
>  	memset(&parent->un.inner, 0, sizeof(parent->un.inner));
>  	INIT_LIST_HEAD(&parent->un.leaf.drop_list);
> @@ -1300,7 +1304,7 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
>  		htb_deactivate(q, cl);
>  
>  	if (last_child)
> -		htb_parent_to_leaf(cl, new_q);
> +		htb_parent_to_leaf(q, cl, new_q);
>  
>  	if (--cl->refcnt == 0)
>  		htb_destroy_class(sch, cl);

-- 
Jan 'yanek' Bortl <yanek [at] ya.bofh. cz>
http://ya.bofh.cz/ | jab: yanek [at] mitranet. cz
-----------------------------------------------------------------
"Maybe one day you will learn that your way is not the only way."
                                         Opher [StarGate: The Nox]
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