ALSA: ua101: 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/20191209094943.14984-69-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/misc/ua101.c

@@ -730,11 +730,7 @@ static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 	mutex_lock(&ua->mutex);
 	err = start_usb_capture(ua);
 	mutex_unlock(&ua->mutex);
-	if (err < 0)
 	return err;
-
-	return snd_pcm_lib_malloc_pages(substream,
-					params_buffer_bytes(hw_params));
 }
 
 static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
@@ -748,16 +744,7 @@ static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 	if (err >= 0)
 		err = start_usb_playback(ua);
 	mutex_unlock(&ua->mutex);
-	if (err < 0)
 	return err;
-
-	return snd_pcm_lib_malloc_pages(substream,
-					params_buffer_bytes(hw_params));
-}
-
-static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-	return snd_pcm_lib_free_pages(substream);
 }
 
 static int capture_pcm_prepare(struct snd_pcm_substream *substream)
@@ -885,7 +872,6 @@ static const struct snd_pcm_ops capture_pcm_ops = {
 	.close = capture_pcm_close,
 	.ioctl = snd_pcm_lib_ioctl,
 	.hw_params = capture_pcm_hw_params,
-	.hw_free = ua101_pcm_hw_free,
 	.prepare = capture_pcm_prepare,
 	.trigger = capture_pcm_trigger,
 	.pointer = capture_pcm_pointer,
@@ -896,7 +882,6 @@ static const struct snd_pcm_ops playback_pcm_ops = {
 	.close = playback_pcm_close,
 	.ioctl = snd_pcm_lib_ioctl,
 	.hw_params = playback_pcm_hw_params,
-	.hw_free = ua101_pcm_hw_free,
 	.prepare = playback_pcm_prepare,
 	.trigger = playback_pcm_trigger,
 	.pointer = playback_pcm_pointer,
@@ -1294,7 +1279,7 @@ static int ua101_probe(struct usb_interface *interface,
 	strcpy(ua->pcm->name, name);
 	snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
 	snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
-	snd_pcm_lib_preallocate_pages_for_all(ua->pcm, SNDRV_DMA_TYPE_VMALLOC,
+	snd_pcm_set_managed_buffer_all(ua->pcm, SNDRV_DMA_TYPE_VMALLOC,
 				       NULL, 0, 0);
 
 	err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],