linux-kernel - RE: [RFC PATCH] pm: prevent suspend until power supply events are processed

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Message-ID: <20ADAB092842284E95860F279283C5642ED08D93@BGSMSX104.gar.corp.intel.com>
Date:	Thu, 4 Sep 2014 16:37:06 +0000
From:	"Tc, Jenny" <jenny.tc@...el.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Zoran Markovic <zrn.markovic@...il.com>
CC:	Anton Vorontsov <anton@...msg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"Arve Hjonnevag" <arve@...roid.com>,
	Todd Poynor <toddpoynor@...gle.com>,
	"John Stultz" <john.stultz@...aro.org>
Subject: RE: [RFC PATCH] pm: prevent suspend until power supply events are
 processed

If the intention is to prevent suspend while processing the power supply uevents, 
Isn't it a good option to use EPOLLWAKEUP? In Android, it's already used by
healthd to achieve the same.

-Jenny

> Subject: Re: [RFC PATCH] pm: prevent suspend until power supply events are
> processed
> 
> On 4 September 2014 10:21, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> >>> >> +       /* dependent power supplies (e.g. battery) may have changed
> >>> >> +        * state as a result of this event, so poll again and hold
> >>> >> +        * the wakeup_source until all events are processed.
> >>> >> +        */
> 
> But isn't this comment still incorrect? Its not about dependent supplies but the race
> between the work-handler and its enqueuing?
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