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

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Date:	Tue, 30 Jun 2015 10:27:24 +0200
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	Stas Sergeev <stsp@...rs.sourceforge.net>
Cc:	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Pavel Machek <pavel@....cz>,
	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>,
	Johan Hovold <johan@...nel.org>, John Lenz <lenz@...wisc.edu>,
	Jonas Gorski <jogo@...nwrt.org>,
	Kim Kyuwon <q1.kim@...sung.com>,
	Kristian Kielhofner <kris@...sk.org>,
	Kristoffer Ericson <kristoffer.ericson@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Milo Kim <milo.kim@...com>,
	Márton Németh <nm127@...email.hu>,
	Nate Case <ncase@...-inc.com>, NeilBrown <neilb@...e.de>,
	Nick Forbes <nick.forbes@...epta.com>,
	Paul Parsons <lost.distance@...oo.com>,
	Peter Meerwald <p.meerwald@...-electronic.com>,
	Phil Sutter <n0-1@...ewrt.org>,
	Philippe Retornaz <philippe.retornaz@...l.ch>,
	Raphael Assenat <raph@...com>,
	Richard Purdie <rpurdie@...nedhand.com>,
	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 06/29/2015 05:17 PM, Stas Sergeev wrote:> 29.06.2015 17:05, Jacek 
Anaszewski пишет:
 >> +		 * If need to disable soft blinking delegate this to the
 >> +		 * work queue task to avoid problems in case we are
 >> +		 * called from hard irq context.
 >> +		 */
 >> +		led_cdev->flags |= LED_BLINK_DISABLE;
 > Wouldn't it be better to just enforce the callers
 > to explicitly disable software blink, so that it to
 > never happen from irq context? Something like in this
 > patch:
 > https://lkml.org/lkml/2015/5/13/491
 >

Blinking can be disabled not only by removing trigger explicitly,
but also by setting brightness to 0 and led_set_brightness
can be called from hard irq context. set_brightness_work
was originally introduced exactly for this use case.

-- 
Best Regards,
Jacek Anaszewski
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