linux-kernel - Re: [PATCH 09/30] sound: don't use flush_scheduled

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Message-ID: <s5hhbejb1yr.wl%tiwai@suse.de>
Date:	Sun, 12 Dec 2010 13:38:36 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH 09/30] sound: don't use flush_scheduled_work()

At Sun, 12 Dec 2010 10:15:55 +0100,
Tejun Heo wrote:
> 
> Hello, Takashi.
> 
> On 12/12/2010 09:56 AM, Takashi Iwai wrote:
> >> diff --git a/sound/soc/codecs/wm8350.c b/sound/soc/codecs/wm8350.c
> >> index 7611add..b3e9fac 100644
> >> --- a/sound/soc/codecs/wm8350.c
> >> +++ b/sound/soc/codecs/wm8350.c
> >> @@ -1626,7 +1626,6 @@ static int  wm8350_codec_remove(struct snd_soc_codec *codec)
> >>  {
> >>  	struct wm8350_data *priv = snd_soc_codec_get_drvdata(codec);
> >>  	struct wm8350 *wm8350 = dev_get_platdata(codec->dev);
> >> -	int ret;
> >>  
> >>  	wm8350_clear_bits(wm8350, WM8350_JACK_DETECT,
> >>  			  WM8350_JDL_ENA | WM8350_JDR_ENA);
> >> @@ -1641,15 +1640,9 @@ static int  wm8350_codec_remove(struct snd_soc_codec *codec)
> >>  	priv->hpr.jack = NULL;
> >>  	priv->mic.jack = NULL;
> >>  
> >> -	/* cancel any work waiting to be queued. */
> >> -	ret = cancel_delayed_work(&codec->delayed_work);
> >> -
> >>  	/* if there was any work waiting then we run it now and
> >>  	 * wait for its completion */
> >> -	if (ret) {
> >> -		schedule_delayed_work(&codec->delayed_work, 0);
> >> -		flush_scheduled_work();
> >> -	}
> >> +	flush_delayed_work_sync(&codec->delayed_work);
> > 
> > I vaguely remember Liam introduced this kind of code by some reason.
> > 
> > Liam, isn't it better for cancel_delayed_work_sync(), or should it be
> > like the above?
> 
> flush_delayed_work_sync() semantics has been recently changed such
> that if a delayed work is pending it's queued immediately and then
> completion is waited.  IOW, the behavior remains unchanged with the
> above change.

Yes, I noticed it while I was reviewing your patch.  So it's pretty
correct.

Meanwhile, I wondered whether it's the really wanted behavior for
that particular code path, thus the previous question to Liam.


thanks,

Takashi
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