linux-kernel - Re: [PATCH] ASoC: fsl_esai: Remove expensive print in irq handler

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Date:   Tue, 21 Apr 2020 18:51:39 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Shengjiu Wang <shengjiu.wang@....com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Takashi Iwai <tiwai@...e.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: fsl_esai: Remove expensive print in irq handler

Hi

On Tue, Apr 21, 2020 at 5:53 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Tue, Apr 21, 2020 at 04:41:23PM +0800, Shengjiu Wang wrote:
> > Use dev_dbg instead of dev_err in irq handler, the dev_err
> > is expensive, we don't need the message to be printed everytime,
> > which is almost a debug option.
>
> >       if (esr & ESAI_ESR_RFF_MASK)
> > -             dev_warn(&pdev->dev, "isr: Receiving overrun\n");
> > +             dev_dbg(&pdev->dev, "isr: Receiving overrun\n");
> >
> >       if (esr & ESAI_ESR_TFE_MASK)
> > -             dev_warn(&pdev->dev, "isr: Transmission underrun\n");
> > +             dev_dbg(&pdev->dev, "isr: Transmission underrun\n");
>
> These are error messages which would suggest a problem that'd lead to
> data corruption, it seems bad not to try to flag that to the user -
> surely we've got bigger problems than performance if this happens?
> Perhaps convert to a ratelimited print if the issue is that when errors
> happen they happen a lot?

Thanks for review, I will rethink about this.

best regards
wang shengjiu