linux-kernel - Re: [PATCH] Driver core: leave runtime PM enabled during system shutdown

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Date:	Tue, 6 Dec 2011 23:05:34 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Stern <stern@...land.harvard.edu>, NeilBrown <neilb@...e.de>,
	Ming Lei <tom.leiming@...il.com>,
	"Chen Peter-B29397" <B29397@...escale.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...r.kernel.org>,
	"hzpeterchen@...il.com" <hzpeterchen@...il.com>,
	Igor Grinberg <grinberg@...pulab.co.il>
Subject: Re: [PATCH] Driver core: leave runtime PM enabled during system shutdown

On Tuesday, December 06, 2011, Greg KH wrote:
> On Tue, Dec 06, 2011 at 10:26:14AM -0500, Alan Stern wrote:
> > Disabling all runtime PM during system shutdown turns out not to be a
> > good idea, because some devices may need to be woken up from a
> > low-power state at that time.
> > 
> > The whole point of disabling runtime PM for system shutdown was to
> > prevent untimely runtime-suspend method calls.  This patch (as1504)
> > accomplishes the same result by incrementing the usage count for each
> > device and waiting for ongoing runtime-PM callbacks to finish.  This
> > is what we already do during system suspend and hibernation, which
> > makes sense since the shutdown method is pretty much a legacy analog
> > of the pm->poweroff method.
> > 
> > This fixes a regression on some OMAP systems.
> > 
> > Signed-off-by: Alan Stern <stern@...land.harvard.edu>
> > Reported-by: NeilBrown <neilb@...e.de>
> > CC: Chen Peter-B29397 <B29397@...escale.com>
> 
> Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> Rafael, you will take this in your tree, right?

Yes, I will, thanks!
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