linux-kernel - Re: [patch]hp_accel: Fix race in device removal

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Message-Id: <20100510225725.6bfdc4a5.akpm@linux-foundation.org>
Date:	Mon, 10 May 2010 22:57:25 -0400
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Eric Piel <eric.piel@...mplin-utc.net>,
	Pavel Machek <pavel@....cz>,
	Pavel Herrmann <morpheus.ibis@...il.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [patch]hp_accel: Fix race in device removal

On Tue, 11 May 2010 07:55:07 +0200 Oliver Neukum <oneukum@...e.de> wrote:

> Am Dienstag, 11. Mai 2010 00:46:32 schrieb Andrew Morton:
> > But alas, I (and presumably others) cannot confirm that, because you
> > didn't describe the bug :( This also means that if someone hits a
> > problem with this driver, they won't easily be able to work out whether
> > this patch will fix it.
> > 
> > 
> > Under what circumstances does it trigger?
> > 
> > What are the observed effects when it triggers?
> > 
> > Please always include this sort of information when sending bugfixes, thanks.
> 
> Sorry,
> 
> the patch closes a window during which a work queue might remain
> active after the device is removed and would then lead to ACPI calls
> with undefined behavior.

Had anyone observed this in the field?  Was a machine crashing, perhaps?
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