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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; 4+ 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] 4+ messages in thread

* Re: [alsa-devel] [PATCH] ASoC: fsl_audmix: Add spin lock to protect tdms
  2019-11-06  7:27 [PATCH] ASoC: fsl_audmix: Add spin lock to protect tdms Shengjiu Wang
@ 2019-11-06 11:36 ` " Daniel Baluta
  2019-11-09  2:45 ` Nicolin Chen
  1 sibling, 0 replies; 4+ messages in thread
From: Daniel Baluta @ 2019-11-06 11:36 UTC (permalink / raw)
  To: Shengjiu Wang
  Cc: Linux-ALSA, Timur Tabi, Xiubo Li, linuxppc-dev, Takashi Iwai,
	Jaroslav Kysela, Nicolin Chen, Mark Brown, Fabio Estevam,
	Linux Kernel Mailing List

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.

thanks,
Daniel.

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] ASoC: fsl_audmix: Add spin lock to protect tdms
  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
  1 sibling, 1 reply; 4+ messages in thread
From: Nicolin Chen @ 2019-11-09  2:45 UTC (permalink / raw)
  To: Shengjiu Wang
  Cc: alsa-devel, timur, Xiubo.Lee, linuxppc-dev, tiwai, perex,
	broonie, festevam, linux-kernel

On Wed, Nov 06, 2019 at 03:27:45PM +0800, Shengjiu Wang 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.

Feels like a bug fix to me, so  might be better to have a "Fixes"
line and CC stable tree?

Anyway, change looks good to me:

Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>

Thanks

> 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] 4+ messages in thread

* Re: [alsa-devel] [PATCH] ASoC: fsl_audmix: Add spin lock to protect tdms
  2019-11-09  2:45 ` Nicolin Chen
@ 2019-11-11  7:37   ` " Shengjiu Wang
  0 siblings, 0 replies; 4+ messages in thread
From: Shengjiu Wang @ 2019-11-11  7:37 UTC (permalink / raw)
  To: Nicolin Chen
  Cc: alsa-devel, timur, Xiubo.Lee, festevam, Shengjiu Wang, tiwai,
	linux-kernel, broonie, linuxppc-dev

Hi

On Sat, Nov 9, 2019 at 10:48 AM Nicolin Chen <nicoleotsuka@gmail.com> wrote:
>
> On Wed, Nov 06, 2019 at 03:27:45PM +0800, Shengjiu Wang 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.
>
> Feels like a bug fix to me, so  might be better to have a "Fixes"
> line and CC stable tree?
>
> Anyway, change looks good to me:
>
> Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
>

Ok, will send v2.

best regards
wang shengjiu

^ permalink raw reply	[flat|nested] 4+ messages in thread

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Thread overview: 4+ 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

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