linux-kernel - Re: [PATCH/RFC RESEND] leds: Use set_brightness_work for brightness

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Date:	Tue, 30 Jun 2015 13:58:09 +0200
From:	Pavel Machek <pavel@...x.de>
To:	Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Stas Sergeev <stsp@...rs.sourceforge.net>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Andreas Werner <andreas.werner@....de>,
	Andrew Lunn <andrew@...n.ch>,
	Antonio Ospite <ospite@...denti.unina.it>,
	Atsushi Nemoto <anemo@....ocn.ne.jp>,
	Ben Dooks <ben@...tec.co.uk>, Chris Boot <bootc@...tc.net>,
	Dan Murphy <dmurphy@...com>,
	Daniel Jeong <daniel.jeong@...com>,
	Daniel Mack <daniel@...que.org>,
	"David S. Miller" <davem@...emloft.net>,
	Fabio Baltieri <fabio.baltieri@...il.com>,
	Felipe Balbi <balbi@...com>,
	Florian Fainelli <florian@...nwrt.org>,
	"G.Shark Jeong" <gshark.jeong@...il.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Ingi Kim <ingi2.kim@...sung.com>,
	Jan-Simon Moeller <dl9pf@....de>,
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	Kristian Kielhofner <kris@...sk.org>,
	Kristoffer Ericson <kristoffer.ericson@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Brown <broonie@...nel.org>,
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	Milo Kim <milo.kim@...com>,
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	Nate Case <ncase@...-inc.com>, NeilBrown <neilb@...e.de>,
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	Peter Meerwald <p.meerwald@...-electronic.com>,
	Phil Sutter <n0-1@...ewrt.org>,
	Philippe Retornaz <philippe.retornaz@...l.ch>,
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	Rod Whitby <rod@...tby.id.au>, Dave Hansen <dave@...1.net>,
	Rodolfo Giometti <giometti@...ux.it>,
	"Sebastian A. Siewior" <bigeasy@...utronix.de>,
	Shuah Khan <shuahkhan@...il.com>,
	Simon Guinot <sguinot@...ie.com>,
	Álvaro Fernández Rojas <noltari@...il.com>
Subject: Re: [PATCH/RFC RESEND] leds: Use set_brightness_work for
 brightness_set ops that can sleep

On Tue 2015-06-30 10:01:08, Jacek Anaszewski wrote:
> This patch rearranges the core LED subsystem code, so that it
> now removes from drivers the responsibility of using work queues
> internally in case their brightness_set ops can sleep.
> Addition of two flags: LED_BRIGHTNESS_FAST and LED_BLINK_DISABLE
> as well as new_brightness_value property to the struct led_classdev
> allows for employing existing set_brightness_work to do the job.
> The modifications allow also to get rid of brightness_set_sync op,
> as flash LED devices can now be handled properly only basing on the
> SET_BRIGHTNESS_SYNC flag.

Are you sure this is good idea?

You'll now use single callback for blocking and non-blocking
behaviour. I'm pretty sure stuff like lockdep will have some fun with
that.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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