* [PATCH V2] ASoC: fsl_audmix: Add spin lock to protect tdms
@ 2019-11-11 7:50 Shengjiu Wang
2019-11-11 12:59 ` [alsa-devel] " Daniel Baluta
0 siblings, 1 reply; 2+ messages in thread
From: Shengjiu Wang @ 2019-11-11 7:50 UTC (permalink / raw)
To: timur, nicoleotsuka, Xiubo.Lee, festevam, lgirdwood, 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.
Fixes: be1df61cf06e ("ASoC: fsl: Add Audio Mixer CPU DAI driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
---
Change in v2
-add Fixes, Cc stable, and Acked-by.
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 related [flat|nested] 2+ messages in thread
* Re: [alsa-devel] [PATCH V2] ASoC: fsl_audmix: Add spin lock to protect tdms
2019-11-11 7:50 [PATCH V2] ASoC: fsl_audmix: Add spin lock to protect tdms Shengjiu Wang
@ 2019-11-11 12:59 ` Daniel Baluta
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Baluta @ 2019-11-11 12:59 UTC (permalink / raw)
To: Shengjiu Wang
Cc: Timur Tabi, Nicolin Chen, Xiubo Li, Fabio Estevam, Liam Girdwood,
Mark Brown, Jaroslav Kysela, Takashi Iwai, Linux-ALSA,
linuxppc-dev, Linux Kernel Mailing List
On Mon, Nov 11, 2019 at 9:53 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.
>
> Fixes: be1df61cf06e ("ASoC: fsl: Add Audio Mixer CPU DAI driver")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
> ---
> Change in v2
> -add Fixes, Cc stable, and Acked-by.
>
> 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
>
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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