netdev - Re: [RFC] lockdep warning in gen_kill

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Date:	Wed, 08 Sep 2010 20:40:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC] lockdep warning in gen_kill_estimator

Le mercredi 08 septembre 2010 à 11:27 -0700, Stephen Hemminger a écrit :
> Saw big lockdep SOFTIRQ-unsafe lock warning in gen_kill_estimator when doing.
> 
>   tc qdisc del dev dummy0 root
> 

> 
> --- a/net/core/gen_estimator.c	2010-09-08 11:16:10.184368926 -0700
> +++ b/net/core/gen_estimator.c	2010-09-08 11:16:24.694194050 -0700
> @@ -270,18 +270,18 @@ void gen_kill_estimator(struct gnet_stat
>  {
>  	struct gen_estimator *e;
>  
> -	spin_lock(&est_tree_lock);
> +	spin_lock_bh(&est_tree_lock);
>  	while ((e = gen_find_node(bstats, rate_est))) {
>  		rb_erase(&e->node, &est_root);
>  
> -		write_lock_bh(&est_lock);
> +		write_lock(&est_lock);
>  		e->bstats = NULL;
> -		write_unlock_bh(&est_lock);
> +		write_unlock(&est_lock);
>  
>  		list_del_rcu(&e->list);
>  		call_rcu(&e->e_rcu, __gen_kill_estimator);
>  	}
> -	spin_unlock(&est_tree_lock);
> +	spin_unlock_bh(&est_tree_lock);
>  }
>  EXPORT_SYMBOL(gen_kill_estimator);
>  

Hmm... I think commit 0b5d404e349c0236
already takes care of this ?

Already in Linus tree 



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