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

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Message-Id: <201005110804.45251.oneukum@suse.de>
Date:	Tue, 11 May 2010 08:04:45 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
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

Am Dienstag, 11. Mai 2010 04:57:25 schrieb Andrew Morton:
> 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?

No, this was found during a code review.

	Regards
		Oliver
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