Re: [PATCH] PM: Introduce core framework for run-time PM of I/O devices (rev. 3)
From: Rafael J. Wysocki
Date: Tue Jun 23 2009 - 12:59:36 EST
On Tuesday 23 June 2009, Rafael J. Wysocki wrote:
> 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.
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