linux-kernel - Re: [PATCH 1/1] PM / Runtime: let rpm_resume fail if rpm disabled and device suspended.

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Date:	Mon, 23 Jun 2014 11:57:37 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Allen Yu <alleny@...dia.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-pm\@vger.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] PM / Runtime: let rpm_resume fail if rpm disabled and device suspended.

Alan Stern <stern@...land.harvard.edu> writes:

[...]

> What we really need to figure out is how to tell the PM core which
> devices may safely have their runtime callbacks invoked during system
> suspend.  For those devices, the core can avoid calling
> pm_runtime_disable() during the suspend_late phase.  That would address
> your requirements, right?

Yes, and something I've attempted a few times over the years, most
recently during the introduction of the pm_runtime_force* functions[1],
which I thought was again an attempt to work around this issue.

I don't think Rafael has ever been too thrilled with that idea
(including the last time[2]), but I think we're to a point now that we
have to manage this somehow.

My attempt to let the bus/subsystem/pm_domain set a flag might be
too simplistic, but I do agree we do need som way to tell the PM core
that runtime PM callbacks are (still) safe.

Kevin

[1] http://marc.info/?l=linux-pm&m=139343222014989&w=2
[2] http://marc.info/?l=linux-pm&m=139346327619875&w=2
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