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

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Date:	Tue, 6 Dec 2011 13:48:47 -0800
From:	Greg KH <greg@...ah.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, 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 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?

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