[PATCH] ASoC: fsl_esai: Remove expensive print in irq handler

[PATCH] ASoC: fsl_esai: Remove expensive print in irq handler

[Shengjiu Wang]

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.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/fsl/fsl_esai.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index c7a49d03463a..453392a9cd68 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -94,10 +94,10 @@ static irqreturn_t esai_isr(int irq, void *devid)
 		dev_dbg(&pdev->dev, "isr: Transmission Initialized\n");
 
 	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");
 
 	if (esr & ESAI_ESR_TLS_MASK)
 		dev_dbg(&pdev->dev, "isr: Just transmitted the last slot\n");
-- 
2.21.0

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

[Mark Brown]

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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?

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

[Shengjiu Wang]

Hi

On Tue, Apr 21, 2020 at 5:53 PM Mark Brown <broonie@kernel.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