linux-kernel - Re: [PATCH] ALSA: echoaudio: cleanup of unnecessary messages

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Date:	Wed, 05 Nov 2014 08:09:46 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Joe Perches <joe@...ches.com>, Jaroslav Kysela <perex@...ex.cz>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] ALSA: echoaudio: cleanup of unnecessary messages

At Wed, 5 Nov 2014 12:31:50 +0530,
Sudip Mukherjee wrote:
> 
> On Tue, Nov 04, 2014 at 10:28:01AM -0800, Joe Perches wrote:
> > On Tue, 2014-11-04 at 23:47 +0530, Sudip Mukherjee wrote:
> > > commit "b5b4a41b392960010fccf1f9ccf8334d612bd450" was dereferencing
> > > chip after it has been freed. This patch fixes that and at the same
> > > time removes some debugging messages, which are unnecessary, as they
> > > are just printing information about entry and exit from a function.
> > > This information we can easily get from ftrace.
> > 
> > Mostly true.
> > 
> > > diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
> > []
> > > @@ -763,10 +755,8 @@ static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
> > >  	spin_lock(&chip->lock);
> > >  	switch (cmd) {
> > >  	case SNDRV_PCM_TRIGGER_RESUME:
> > > -		dev_dbg(chip->card->dev, "pcm_trigger resume\n");
> > >  	case SNDRV_PCM_TRIGGER_START:
> > >  	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> > > -		dev_dbg(chip->card->dev, "pcm_trigger start\n");
> > >  		for (i = 0; i < DSP_MAXPIPES; i++) {
> > >  			if (channelmask & (1 << i)) {
> > >  				pipe = chip->substream[i]->runtime->private_data;
> > 
> > These may not be useful but this switch state information
> > can't be got from ftrace.
> is this information required? trigger callback will be called everytime pcm is started, stopped or paused. then log will be full of just these messages.
> if it is required then i can send a v2, if not required then also i can send another cleanup patch to clear the other prints in the
> switch-case of other devices in echoaudio.

There has been never such "requirement".  It's merely a debug code.


Takashi
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