Re: [PATCH v5 6/9] ALSA: virtio: PCM substream operators

[Takashi Iwai <tiwai@suse.de>]

On Mon, 22 Feb 2021 16:34:41 +0100,
Anton Yakovlev wrote:
> +static int virtsnd_pcm_open(struct snd_pcm_substream *substream)
> +{
> +	struct virtio_pcm *vpcm = snd_pcm_substream_chip(substream);
> +	struct virtio_pcm_substream *vss = NULL;
> +
> +	if (vpcm) {
> +		switch (substream->stream) {
> +		case SNDRV_PCM_STREAM_PLAYBACK:
> +		case SNDRV_PCM_STREAM_CAPTURE: {

The switch() here looks superfluous.  The substream->stream must be a
good value in the callback.  If any, you can put WARN_ON() there, but
I don't think it worth.

> +static int virtsnd_pcm_hw_params(struct snd_pcm_substream *substream,
> +				 struct snd_pcm_hw_params *hw_params)
> +{
....
> +	return virtsnd_pcm_msg_alloc(vss, periods, period_bytes);

We have the allocation, but...

> +static int virtsnd_pcm_hw_free(struct snd_pcm_substream *substream)
> +{
> +	return 0;

... no release at hw_free()?
I know that the free is present in the allocator, but it's only for
re-allocation case, I suppose.


thanks,

Takashi