linux-kernel - Re: [PATCH] PM: Introduce core framework for run-time PM of I/O devices (rev. 3)

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Date:	Tue, 23 Jun 2009 19:00:03 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-pm@...ts.linux-foundation.org,
	Oliver Neukum <oliver@...kum.org>,
	Magnus Damm <magnus.damm@...il.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>, Greg KH <gregkh@...e.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] PM: Introduce core framework for run-time PM of I/O devices (rev. 3)

On Tuesday 23 June 2009, Rafael J. Wysocki wrote:
> Hi,
> 
> Below is a new revision of the patch introducing the run-time PM framework.
> 
> The most visible changes from the last version:
> 
> * I realized that if child_count is atomic, we can drop the parent locking from
>   all of the functions, so I did that.
> 
> * Introduced pm_runtime_put() that decrements the resume counter and queues
>   up an idle notification if the counter went down to 0 (and wasn't 0 previously).
>   Using asynchronous notification makes it possible to call pm_runtime_put()
>   from interrupt context, if necessary.
> 
> * Changed the meaning of the RPM_WAKE bit slightly (it is now also used for
>   disabling run-time PM for a device along with the resume counter).
> 
> Please let me know if I've overlooked anything. :-)

Well, I found quite a few problems myself, mostly related to disabling-enabling
of the run-time PM and to RPM_WAKE.

Updated patch will be sent out later today.

Best,
Rafael
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