linux-kernel - Re: [PATCH v3 2/2] PM / Runtime: Add pm_runtime_enable

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Message-ID: <26522847.rzj8GpQKux@vostro.rjw.lan>
Date:	Wed, 20 May 2015 01:39:25 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-pm@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] PM / Runtime: Add pm_runtime_enable_recursive

On Tuesday, May 19, 2015 01:49:15 PM Alan Stern wrote:
> On Tue, 19 May 2015, Tomeu Vizoso wrote:
> 
> > This function makes less cumbersome to enable runtime PM in a device and
> > its descendants.
> > 
> > Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> 
> I don't see the point of this.  In the scenario you have in mind, are
> the device and all its descendants registered by the same
> subsystem/driver?  If they are, can't the subsystem/driver code enable
> runtime PM for each of them when they are registered, by adding a
> single call in the right spot?
> 
> If they don't all belong to the same subsystem/driver, who is going to 
> call your pm_runtime_enable_recursive routine?  No single caller will 
> have the right to enable runtime PM for all these devices.

Agreed.


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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