linux-kernel - Re: [PATCH] ASoC: soc-pcm: change error message to debug message

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Date:   Tue, 9 Feb 2021 15:37:46 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, perex@...ex.cz,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: soc-pcm: change error message to debug message

On Tue, Feb 9, 2021 at 12:39 AM Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.com> wrote:
>
>
>
> On 2/8/21 2:12 AM, Shengjiu Wang wrote:
> > This log message should be a debug message, because it
> > doesn't return directly but continue next loop.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > ---
> >   sound/soc/soc-pcm.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
> > index 605acec48971..cd9e919d7b99 100644
> > --- a/sound/soc/soc-pcm.c
> > +++ b/sound/soc/soc-pcm.c
> > @@ -1344,8 +1344,8 @@ static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
> >               /* is there a valid BE rtd for this widget */
> >               be = dpcm_get_be(card, widget, stream);
> >               if (!be) {
> > -                     dev_err(fe->dev, "ASoC: no BE found for %s\n",
> > -                                     widget->name);
> > +                     dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
> > +                             widget->name);
>
> Do we really want to do this?
>
> This error message has historically been the means by which we detect
> that userspace didn't set the right mixers (e.g. on Intel Baytrail) or
> the topology was incorrect. And it's really an error in the sense that
> you will not get audio in or out.
>
> If you demote this to dev_dbg, we'll have to ask every single user who
> reports 'sound is broken' to enable dynamic debug traces. I really don't
> see the benefit, this is a clear case of 'fail big and fail early',
> partly concealing the problem doesn't make it go away but harder to
> diagnose.

Thanks for the explanation,  it seems I misunderstood this error message.

Best regards
Wang shengjiu