ALSA: pcxhr: 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/20191209094943.14984-50-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/pcxhr/pcxhr.c

@@ -940,32 +940,16 @@ static int pcxhr_hw_params(struct snd_pcm_substream *subs,
 	struct snd_pcxhr *chip = snd_pcm_substream_chip(subs);
 	struct pcxhr_mgr *mgr = chip->mgr;
 	struct pcxhr_stream *stream = subs->runtime->private_data;
-	snd_pcm_format_t format;
-	int err;
-	int channels;
-
-	/* set up channels */
-	channels = params_channels(hw);
-
-	/*  set up format for the stream */
-	format = params_format(hw);
 
 	mutex_lock(&mgr->setup_mutex);
 
-	stream->channels = channels;
-	stream->format = format;
-
-	/* allocate buffer */
-	err = snd_pcm_lib_malloc_pages(subs, params_buffer_bytes(hw));
+	/* set up channels */
+	stream->channels = params_channels(hw);
+	/* set up format for the stream */
+	stream->format = params_format(hw);
 
 	mutex_unlock(&mgr->setup_mutex);
 
-	return err;
-}
-
-static int pcxhr_hw_free(struct snd_pcm_substream *subs)
-{
-	snd_pcm_lib_free_pages(subs);
 	return 0;
 }
 
@@ -1139,7 +1123,6 @@ static const struct snd_pcm_ops pcxhr_ops = {
 	.ioctl     = snd_pcm_lib_ioctl,
 	.prepare   = pcxhr_prepare,
 	.hw_params = pcxhr_hw_params,
-	.hw_free   = pcxhr_hw_free,
 	.trigger   = pcxhr_trigger,
 	.pointer   = pcxhr_stream_pointer,
 };
@@ -1170,9 +1153,9 @@ int pcxhr_create_pcm(struct snd_pcxhr *chip)
 	pcm->nonatomic = true;
 	strcpy(pcm->name, name);
 
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
-					      &chip->mgr->pci->dev,
-					      32*1024, 32*1024);
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
+				       &chip->mgr->pci->dev,
+				       32*1024, 32*1024);
 	chip->pcm = pcm;
 	return 0;
 }