ALSA: gus: 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/20191209094943.14984-16-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/gus/gus_pcm.c

@@ -423,11 +423,8 @@ static int snd_gf1_pcm_playback_hw_params(struct snd_pcm_substream *substream,
 	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct gus_pcm_private *pcmp = runtime->private_data;
-	int err;
 
-	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
-		return err;
-	if (err > 0) {	/* change */
+	if (runtime->buffer_changed) {
 		struct snd_gf1_mem_block *block;
 		if (pcmp->memory > 0) {
 			snd_gf1_mem_free(&gus->gf1.mem_alloc, pcmp->memory);
@@ -471,7 +468,6 @@ static int snd_gf1_pcm_playback_hw_free(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct gus_pcm_private *pcmp = runtime->private_data;
 
-	snd_pcm_lib_free_pages(substream);
 	if (pcmp->pvoices[0]) {
 		snd_gf1_free_voice(pcmp->gus, pcmp->pvoices[0]);
 		pcmp->pvoices[0] = NULL;
@@ -574,12 +570,7 @@ static int snd_gf1_pcm_capture_hw_params(struct snd_pcm_substream *substream,
 		gus->gf1.pcm_rcntrl_reg |= 4;
 	if (snd_pcm_format_unsigned(params_format(hw_params)))
 		gus->gf1.pcm_rcntrl_reg |= 0x80;
-	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
-}
-
-static int snd_gf1_pcm_capture_hw_free(struct snd_pcm_substream *substream)
-{
-	return snd_pcm_lib_free_pages(substream);
+	return 0;
 }
 
 static int snd_gf1_pcm_capture_prepare(struct snd_pcm_substream *substream)
@@ -846,7 +837,6 @@ static const struct snd_pcm_ops snd_gf1_pcm_capture_ops = {
 	.close =	snd_gf1_pcm_capture_close,
 	.ioctl =	snd_pcm_lib_ioctl,
 	.hw_params =	snd_gf1_pcm_capture_hw_params,
-	.hw_free =	snd_gf1_pcm_capture_hw_free,
 	.prepare =	snd_gf1_pcm_capture_prepare,
 	.trigger =	snd_gf1_pcm_capture_trigger,
 	.pointer =	snd_gf1_pcm_capture_pointer,
@@ -875,7 +865,7 @@ int snd_gf1_pcm_new(struct snd_gus_card *gus, int pcm_dev, int control_index)
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_gf1_pcm_playback_ops);
 
 	for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next)
-		snd_pcm_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV,
+		snd_pcm_set_managed_buffer(substream, SNDRV_DMA_TYPE_DEV,
 					   card->dev,
 					   64*1024, gus->gf1.dma1 > 3 ? 128*1024 : 64*1024);
 	
@@ -885,7 +875,7 @@ int snd_gf1_pcm_new(struct snd_gus_card *gus, int pcm_dev, int control_index)
 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_gf1_pcm_capture_ops);
 		if (gus->gf1.dma2 == gus->gf1.dma1)
 			pcm->info_flags |= SNDRV_PCM_INFO_HALF_DUPLEX;
-		snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
+		snd_pcm_set_managed_buffer(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
 					   SNDRV_DMA_TYPE_DEV, card->dev,
 					   64*1024, gus->gf1.dma2 > 3 ? 128*1024 : 64*1024);
 	}