ALSA: spi: Use managed buffer allocation

Clean up the driver with the new managed buffer allocation API.
The hw_free callback became superfluous and got dropped.

Link: https://lore.kernel.org/r/20191209094943.14984-64-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/spi/at73c213.c

@@ -242,13 +242,7 @@ static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
 	val = SSC_BFINS(TFMR_DATNB, channels - 1, val);
 	ssc_writel(chip->ssc->regs, TFMR, val);
 
-	return snd_pcm_lib_malloc_pages(substream,
-					params_buffer_bytes(hw_params));
-}
-
-static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-	return snd_pcm_lib_free_pages(substream);
+	return 0;
 }
 
 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
@@ -324,7 +318,6 @@ static const struct snd_pcm_ops at73c213_playback_ops = {
 	.close		= snd_at73c213_pcm_close,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= snd_at73c213_pcm_hw_params,
-	.hw_free	= snd_at73c213_pcm_hw_free,
 	.prepare	= snd_at73c213_pcm_prepare,
 	.trigger	= snd_at73c213_pcm_trigger,
 	.pointer	= snd_at73c213_pcm_pointer,
@@ -347,7 +340,7 @@ static int snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
 
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops);
 
-	snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
+	snd_pcm_set_managed_buffer_all(chip->pcm,
 			SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev,
 			64 * 1024, 64 * 1024);
 out: