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

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Date:	Thu, 21 Aug 2008 03:05:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	denys@...p.net.lb
Subject: Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().

From: Jarek Poplawski <jarkao2@...il.com>
Date: Thu, 21 Aug 2008 10:01:55 +0000

> If we do this with child qdisc from qdisc_graft() it's without
> deactivation. The rest of the tree can be dequeued in the meantime
> and call qdisc_tree_decrease_qlen() (like hfsc, tbf, netem), which
> uses qdisc_lookup() to access this list. We list_del() under rtnl
> lock only, they lookup under sch_tree_lock(). Is it a bit unsafe
> or I miss something?

They hold RTNL as well.

Remember, sch_tree_lock() uses qdisc_root_lock() which as I've
told you at least twice now asserts that RTNL is held :-)
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