linux-kernel - Re: [PATCH 1/2] PM / Runtime: Add sysfs switch for disabling device run-time PM (rev. 2)

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Message-ID: <Pine.LNX.4.44L0.1001221740270.20253-100000@netrider.rowland.org>
Date:	Fri, 22 Jan 2010 17:45:51 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Matthew Garrett <mjg59@...f.ucam.org>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH 1/2] PM / Runtime: Add sysfs switch for disabling device
 run-time PM (rev. 2)

On Fri, 22 Jan 2010, Rafael J. Wysocki wrote:

> > For example, we disable runtime PM for most USB devices by default.  
> > But a few drivers may know that their devices are able to handle it, so 
> > they want to change the default setting when they are bound.
> 
> Runtime PM is disabled for all devices by default unless the driver enables
> it.  The setting in power/control is to override the driver's choice, so that
> it can be disabled even if the driver tries to enable it.
> 
> IOW, the user space is the owner of the power.runtime_auto flag and I don't
> think we should allow drivers to modify it.

Okay, I understand your point of view.  It means I'll have to make some 
changes to the USB code.  No problem.

Alan Stern

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