From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH] PERF(kernel): Cleanup power events V2
Date: Tue, 26 Oct 2010 19:58:14 +0200
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To: Pierre Tardy <tardyp@gmail.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>, Ingo Molnar <mingo@elte.hu>, Thomas Renninger <trenn@suse.de>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Frank Eigler <fche@redhat.com>, Steven Rostedt <rostedt@goodmis.org>, Kevin Hilman <khilman@deeprootsystems.com>, linux-omap@vger.kernel.org, rjw@sisk.pl, linux-pm@lists.linux-foundation.org, linux-trace-users@vger.kernel.org, Jean Pihet <jean.pihet@newoldbits.com>, Frederic Weisbecker <fweisbec@gmail.com>, Tejun Heo <tj@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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On Tue, 2010-10-26 at 11:56 -0500, Pierre Tardy wrote:
> 
> +       trace_runtime_pm_usage(dev, atomic_read(&dev->power.usage_count)+1);
>         atomic_inc(&dev->power.usage_count); 

That's terribly racy..