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

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Date:	Thu, 2 Sep 2010 16:45:25 -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:

> >> I think it would be better to change device_pm_init() and add a
> >> complete_all().
> >
> > I agree.
> That would work, and was my first solution, but it increases the
> reliance on the completion variable being left completed between state
> transitions, which is undocumented and unnecessary.  It seems more
> straightforward to me to only wait on the parent if the parent is
> suspended.

How about calling complete_all() from within dpm_prepare() as well?  
Then it will get initialized properly at the beginning of every sleep 
transition.

Alan Stern

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