netdev - Re: 2.6.25rc7 lockdep trace

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Date:	Sat, 29 Mar 2008 13:50:55 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, davej@...emonkey.org.uk,
	netdev@...r.kernel.org
Subject: Re: 2.6.25rc7 lockdep trace


> > When you call cancel_work_sync(), the work struct will be grabbed by the
> > code (really __cancel_work_timer) and removed from the queue. That just
> > operates on bits and a spinlock, not locks held across the struct work
> > function execution, and ensures it is race-free without needing any such
> > locks
> 
> ...
> 
> > However, as I just tried to explain, cancel_work_sync() _is_ safe to run
> > while holding the RTNL because it doesn't need any runqueue lock.
> 
> These issues are so seldom now that I forget these details each time
> 
> "after use", so maybe I miss something again, but shouldn't this rather
> read something like this?:
> 
> cancel_work_sync() _is_ safe to run while holding the RTNL against
> works which don't take RTNL.

Yes, indeed, I should have said that.

johannes

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