Hi
>
> Hi Shengjiu,
>
> Comments inline.
>
> On Wed, Nov 6, 2019 at 9:30 AM Shengjiu Wang <shengjiu.wang@xxxxxxx>
> 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@xxxxxxx>
> > ---
> > 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
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