linux-kernel - Re: [RFC][PATCH 3/5] PM core: Make async suspend/resume of devices use device links

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Message-ID: <20160608125906.GI7510@sirena.org.uk>
Date:	Wed, 8 Jun 2016 13:59:06 +0100
From:	Mark Brown <broonie@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Grant Likely <grant.likely@...aro.org>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Thierry Reding <treding@...dia.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Michael Turquette <mturquette@...libre.com>
Subject: Re: [RFC][PATCH 3/5] PM core: Make async suspend/resume of devices
 use device links

On Thu, Jan 14, 2016 at 02:55:25AM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Make the device suspend/resume part of the core system
> suspend/resume code use device links to ensure that supplier
> and consumer devices will be suspended and resumed in the right
> order in case of async suspend/resume.
> 
> The idea, roughly, is to use dpm_wait() to wait for all consumers
> before a supplier device suspend and to wait for all suppliers
> before a consumer device resume.

Same question with parents using their child - I'm thinking that perhaps
we can arrange for the struct device of the parent to get used and
ignore the child device outside of the MFD.

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