| Message ID | 1573025265-31852-1-git-send-email-shengjiu.wang@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ASoC: fsl_audmix: Add spin lock to protect tdms | expand |
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.
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 >
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
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; };
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(+)