netdev - Re: [BUG] RTNL and flush_scheduled

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Message-ID: <45D60022.9060701@candelatech.com>
Date:	Fri, 16 Feb 2007 11:04:02 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	Jarek Poplawski <jarkao2@...pl>,
	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org,
	Kyle Lucke <klucke@...ibm.com>,
	Raghavendra Koushik <raghavendra.koushik@...erion.com>,
	Al Viro <viro@....linux.org.uk>
Subject: Re: [BUG] RTNL and flush_scheduled_work deadlocks

Stephen Hemminger wrote:
> On Thu, 15 Feb 2007 23:40:32 -0800
> Ben Greear <greearb@...delatech.com> wrote:

>> Maybe there should be something like an ASSERT_NOT_RTNL() in the 
>> flush_scheduled_work()
>> method?  If it's performance criticial, #ifdef it out if we're not 
>> debugging locks?
>>
> 
> You can't safely add a check like that. What if another cpu had acquired
> RTNL and was unrelated.

I guess there isn't a way to see if *this* thread is the owner of the RTNL
currently?  I think lockdep knows the owner...maybe could query it somehow,
or just save the owner in the mutex object when debugging is enabled...

Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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