> > +static void rt5514_spi_copy_work(struct work_struct *work)
> > +{
> > + struct rt5514_dsp *rt5514_dsp =
> > + container_of(work, struct rt5514_dsp, copy_work.work);
> > + struct snd_pcm_runtime *runtime = rt5514_dsp->substream->runtime;
> > + size_t period_bytes, truncated_bytes = 0;
>
> I can't see anything that cancels this work when the PCM stream to
> userspace is stopped or if things power off otherwise?
>
In the beginning of the function "rt5514_spi_copy_work", there is a if
condition to check the variable "rt5514_dsp->substream", and the function
"rt5514_spi_hw_free" will set the variable "rt5514_dsp->substream" to NULL.
It also will make the delayed work stop and won't schedule again.
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