netdev - Re: [PATCH net-2.6] pkt_sched: gen

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Message-ID: <1275973091.2775.51.camel@edumazet-laptop>
Date:	Tue, 08 Jun 2010 06:58:11 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Jarek Poplawski <jarkao2@...il.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-2.6] pkt_sched: gen_estimator: add a new lock

Le mardi 08 juin 2010 à 09:00 +0800, Changli Gao a écrit :

> and I think gen_replace_estimator is expected to be an atomic operation.
> 
> And gen_estimator_active() is also assumed to be called with RTNL locked.
> 

My patch fixes a bug of new/kill operators, regardless of RTNL being
held or not. Its should be small enough to be included in linux-2.6.35.

If what you say is right, all gen_replace_estimator() /
gen_estimator_active() callers should still holds RTNL.
I didnt change this part.
If you believe one caller doesnt hold RTNL, please submit another patch.

Then, in net-next-2.6, we can probably cleanup this to remove RTNL
requirement if possible for gen_replace_estimator() /
gen_estimator_active()

Yes, it sounds a bit difficult (three patches instead of a single one),
but this is the how things should be done, step by step.

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