linux-kernel - Re: [linux-pm] [PATCH 2/2] i2c: Factor out runtime suspend checks from PM operations

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Date:	Wed, 22 Dec 2010 22:08:59 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Rabin Vincent <rabin@....in>, Ben Dooks <ben-linux@...ff.org>,
	Jean Delvare <khali@...ux-fr.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pm@...ts.linux-foundation.org,
	patches@...nsource.wolfsonmicro.com, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [PATCH 2/2] i2c: Factor out runtime suspend checks from PM operations

On Wednesday, December 22, 2010, Mark Brown wrote:
> On Wed, Dec 22, 2010 at 08:40:23PM +0530, Rabin Vincent wrote:
> 
> > Shouldn't you be deleting the pm_runtime_* stuff from here?  There is
> > already done in pm_generic_restore() iff the callback exists and returns
> > zero.
> 
> I guess; it's not clear why this is being done by the bus at all or how
> it interacts with the legacy stuff.

It is done, because when the driver's ->resume() or ->restore() brings the
device up (which should have happened if it returned 0), we need to mark
the device as "active" for runtime PM.

Since __pm_generic_resume() does that, it's not necessary to do it in the
bus type callbacks (in the "legacy" case we known that runtime PM is not
supported).

Thanks,
Rafael
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