netdev - Wireless regression in workqueue: use mod_delayed_work() instead of _

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Date:	Wed, 28 Nov 2012 10:13:55 -0500 (EST)
From:	Anders Kaseorg <andersk@....EDU>
To:	Tejun Heo <tj@...nel.org>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	"John W. Linville" <linville@...driver.com>
cc:	netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-kernel@...r.org
Subject: Wireless regression in workqueue: use mod_delayed_work() instead of
 __cancel + queue

My Intel 6250 wireless card (iwldvm) can no longer associate with a 
WPA-Enterprise network (PEAP-MSCHAPv2).  To my surprise, I bisected this 
regression to commit e7c2f967445dd2041f0f8e3179cca22bb8bb7f79, 
workqueue: use mod_delayed_work() instead of __cancel + queue.

A bunch of logs collected by Ubuntu apport are in this bug report: 
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1083980

How can I help to debug this?

I see that someone else reported another regression with the same commit 
last week, although this looks unrelated at first glance: 
  http://thread.gmane.org/gmane.linux.kernel/1395938

Anders
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