linux-kernel - Re: [PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 8)

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Message-Id: <1208133631.6958.85.camel@pasglop>
Date:	Mon, 14 Apr 2008 10:40:31 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Nigel Cunningham <ncunningham@...a.org.au>,
	Greg KH <greg@...ah.com>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	David Brownell <david-b@...bell.net>,
	Pavel Machek <pavel@....cz>, Oliver Neukum <oliver@...kum.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] PM: Introduce new top level suspend and
	hibernation callbacks (rev. 8)


> Please have a look at this thread:
> http://lkml.org/lkml/2008/3/21/322
> (in short, the reporter sees APM suspend breakage under stress, occuring
> because APM uses our suspending of devices without the freezer).
> 
> It mostly appears to work without the freezer, but that's bacuse no one
> actually does things that might break it.  I don't think we can rely on users
> being so kind to us forever. :-)

As far as I'm concerned, it's yet another case of the freezer papering
over a problem rather than fixing it properly.

If we're going to introduce new callbacks, we should have the right
semantic from day 1 -and- fix those problems, rather than going to the
same old recursive nonsensical arguments and do things to paper over
problems.

Ben.


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