Subject: Re: [BUG] RTNL and flush_scheduled_work deadlocks

From: Ben Greear <[email-masked]>
Date: Fri, 16 Feb 2007 11:04:02 -0800

Stephen Hemminger wrote:
> On Thu, 15 Feb 2007 23:40:32 -0800
> Ben Greear <[email-masked]> 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 <[email-masked]>
Candela Technologies Inc  http://www.candelatech.com