linux-kernel - Re: [PATCH] PM: Prevent waiting forever on asynchronous resume after abort

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Message-ID: <Pine.LNX.4.44L0.1009021723460.1311-100000@iolanthe.rowland.org>
Date:	Thu, 2 Sep 2010 17:34:08 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Colin Cross <ccross@...roid.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...ts.linux-foundation.org>, Pavel Machek <pavel@....cz>,
	Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] PM: Prevent waiting forever on asynchronous resume after
 abort

On Thu, 2 Sep 2010, Colin Cross wrote:

> That would work, but I still don't see why it's better.  With either
> of your changes, the power.completion variable is storing state, and
> not just used for notification.  However, the exact meaning of that
> state is unclear, especially during the transition from an aborted
> suspend to resume, and the state is duplicating power.status.  Setting
> it to complete in dpm_prepare is especially confusing, because at that
> point nothing is completed, it hasn't even been started.

The state being waited for varies from time to time and is only
partially related to power.status.  Instead of using a completion I
suppose we could have used a new "transition_complete" variable
together with a waitqueue.  Would you prefer that?  It's effectively
the same thing as a completion, but without the nice packaging already 
provided by the kernel.

Alan Stern

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