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* [PATCH] ASoC: fsl_audmix: Add spin lock to protect tdms
@ 2019-11-06  7:27 Shengjiu Wang
  2019-11-06 11:36 ` [alsa-devel] " Daniel Baluta
  2019-11-09  2:45 ` Nicolin Chen
  0 siblings, 2 replies; 6+ messages in thread
From: Shengjiu Wang @ 2019-11-06  7:27 UTC (permalink / raw)
  To: timur, nicoleotsuka, Xiubo.Lee, festevam, broonie, perex, tiwai,
	alsa-devel, linuxppc-dev, linux-kernel

Audmix support two substream, When two substream start
to run, the trigger function may be called by two substream
in same time, that the priv->tdms may be updated wrongly.

The expected priv->tdms is 0x3, but sometimes the
result is 0x2, or 0x1.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/fsl/fsl_audmix.c | 6 ++++++
 sound/soc/fsl/fsl_audmix.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/sound/soc/fsl/fsl_audmix.c b/sound/soc/fsl/fsl_audmix.c
index c7e4e9757dce..a1db1bce330f 100644
--- a/sound/soc/fsl/fsl_audmix.c
+++ b/sound/soc/fsl/fsl_audmix.c
@@ -286,6 +286,7 @@ static int fsl_audmix_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 				  struct snd_soc_dai *dai)
 {
 	struct fsl_audmix *priv = snd_soc_dai_get_drvdata(dai);
+	unsigned long lock_flags;
 
 	/* Capture stream shall not be handled */
 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
@@ -295,12 +296,16 @@ static int fsl_audmix_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		spin_lock_irqsave(&priv->lock, lock_flags);
 		priv->tdms |= BIT(dai->driver->id);
+		spin_unlock_irqrestore(&priv->lock, lock_flags);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		spin_lock_irqsave(&priv->lock, lock_flags);
 		priv->tdms &= ~BIT(dai->driver->id);
+		spin_unlock_irqrestore(&priv->lock, lock_flags);
 		break;
 	default:
 		return -EINVAL;
@@ -491,6 +496,7 @@ static int fsl_audmix_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->ipg_clk);
 	}
 
+	spin_lock_init(&priv->lock);
 	platform_set_drvdata(pdev, priv);
 	pm_runtime_enable(dev);
 
diff --git a/sound/soc/fsl/fsl_audmix.h b/sound/soc/fsl/fsl_audmix.h
index 7812ffec45c5..479f05695d53 100644
--- a/sound/soc/fsl/fsl_audmix.h
+++ b/sound/soc/fsl/fsl_audmix.h
@@ -96,6 +96,7 @@ struct fsl_audmix {
 	struct platform_device *pdev;
 	struct regmap *regmap;
 	struct clk *ipg_clk;
+	spinlock_t lock; /* Protect tdms */
 	u8 tdms;
 };
 
-- 
2.21.0


^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [alsa-devel] [PATCH] ASoC: fsl_audmix: Add spin lock to protect tdms
@ 2019-11-07  6:54 S.j. Wang
  2019-11-11 12:59 ` Daniel Baluta
  0 siblings, 1 reply; 6+ messages in thread
From: S.j. Wang @ 2019-11-07  6:54 UTC (permalink / raw)
  To: Daniel Baluta
  Cc: Linux-ALSA, Timur Tabi, Xiubo Li, linuxppc-dev, Takashi Iwai,
	Jaroslav Kysela, Nicolin Chen, Mark Brown, Fabio Estevam,
	Linux Kernel Mailing List

Hi
> 
> Hi Shengjiu,
> 
> Comments inline.
> 
> On Wed, Nov 6, 2019 at 9:30 AM Shengjiu Wang <shengjiu.wang@nxp.com>
> wrote:
> >
> > Audmix support two substream, When two substream start to run, the
> > trigger function may be called by two substream in same time, that the
> > priv->tdms may be updated wrongly.
> >
> > The expected priv->tdms is 0x3, but sometimes the result is 0x2, or
> > 0x1.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> > ---
> >  sound/soc/fsl/fsl_audmix.c | 6 ++++++  sound/soc/fsl/fsl_audmix.h | 1
> > +
> >  2 files changed, 7 insertions(+)
> >
> > diff --git a/sound/soc/fsl/fsl_audmix.c b/sound/soc/fsl/fsl_audmix.c
> > index c7e4e9757dce..a1db1bce330f 100644
> > --- a/sound/soc/fsl/fsl_audmix.c
> > +++ b/sound/soc/fsl/fsl_audmix.c
> > @@ -286,6 +286,7 @@ static int fsl_audmix_dai_trigger(struct
> snd_pcm_substream *substream, int cmd,
> >                                   struct snd_soc_dai *dai)  {
> >         struct fsl_audmix *priv = snd_soc_dai_get_drvdata(dai);
> > +       unsigned long lock_flags;
> >
> >         /* Capture stream shall not be handled */
> >         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
> > @@ -295,12 +296,16 @@ static int fsl_audmix_dai_trigger(struct
> snd_pcm_substream *substream, int cmd,
> >         case SNDRV_PCM_TRIGGER_START:
> >         case SNDRV_PCM_TRIGGER_RESUME:
> >         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> > +               spin_lock_irqsave(&priv->lock, lock_flags);
> 
> Why do we need to disable interrupts here? I assume that lock is only
> used in process context.
> 
It is in atomic context, so I think it is ok to disable interrupt. 

Best regards
Wang shengjiu


^ permalink raw reply	[flat|nested] 6+ messages in thread

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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-06  7:27 [PATCH] ASoC: fsl_audmix: Add spin lock to protect tdms Shengjiu Wang
2019-11-06 11:36 ` [alsa-devel] " Daniel Baluta
2019-11-09  2:45 ` Nicolin Chen
2019-11-11  7:37   ` [alsa-devel] " Shengjiu Wang
2019-11-07  6:54 S.j. Wang
2019-11-11 12:59 ` Daniel Baluta

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