netdev - Re: [NET]: gen_estimator: fix locking and timer related bugs [Re: [Bugme-new] [Bug 8668] New: HTB Deadlock]

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Date:	Thu, 28 Jun 2007 15:03:35 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org,
	"bugme-daemon\@kernel-bugs\.osdl\.org" 
	<bugme-daemon@...nel-bugs.osdl.org>, ranko@...dernet.net
Subject: Re: [NET]: gen_estimator: fix locking and timer related bugs [Re: [Bugme-new] [Bug 8668] New: HTB Deadlock]

On Thu, Jun 28, 2007 at 02:23:36PM +0200, Patrick McHardy wrote:
> Jarek Poplawski wrote:
> >>@@ -202,7 +201,6 @@ void gen_kill_estimator(struct gnet_stats_basic 
> >>*bstats,
> >> 	struct gen_estimator *est, **pest;
> >> 
> >> 	for (idx=0; idx <= EST_MAX_INTERVAL; idx++) {
> >>-		int killed = 0;
> >> 		pest = &elist[idx].list;
> >> 		while ((est=*pest) != NULL) {
> >
> >So, maybe this list walking here needs some locking too?
> 
> It depends on whether estimators should be able to rely on
> the rtnl in the future or be completely responsible for their
> own locking. My patch yesterday was made under the assumption
> that they shouldn't rely on external locking, which seemed to
> be the right thing for a "generic" implementation. OTOH its
> still specific to networking, so relying on the rtnl doesn't
> sound too unreasonable too. I'm beginning to thing I made
> the wrong choice with my patch.
> 
> I'm busy right now, would you mind looking into a patch that
> only deals with the timer races, but still relies on the
> rtnl?

In that case this patch looks OK & enough.

My earlier proposals are only of cosmetical value.

Jarek P.
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