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

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Message-ID: <4683A848.5040907@trash.net>
Date:	Thu, 28 Jun 2007 14:23:36 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jarek Poplawski <jarkao2@...pl>
CC:	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org,
	"bugme-daemon@...nel-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]

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?

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