ASoC: generic-dmaengine-pcm: Use managed buffer allocation

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

Cc: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210142614.19405-11-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-generic-dmaengine-pcm.c

@@ -104,7 +104,7 @@ static int dmaengine_pcm_hw_params(struct snd_soc_component *component,
 			return ret;
 	}
 
-	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
+	return 0;
 }
 
 static int
@@ -168,12 +168,6 @@ static int dmaengine_pcm_close(struct snd_soc_component *component,
 	return snd_dmaengine_pcm_close(substream);
 }
 
-static int dmaengine_pcm_hw_free(struct snd_soc_component *component,
-				 struct snd_pcm_substream *substream)
-{
-	return snd_pcm_lib_free_pages(substream);
-}
-
 static int dmaengine_pcm_trigger(struct snd_soc_component *component,
 				 struct snd_pcm_substream *substream, int cmd)
 {
@@ -261,7 +255,7 @@ static int dmaengine_pcm_new(struct snd_soc_component *component,
 			return -EINVAL;
 		}
 
-		snd_pcm_lib_preallocate_pages(substream,
+		snd_pcm_set_managed_buffer(substream,
 				SNDRV_DMA_TYPE_DEV_IRAM,
 				dmaengine_dma_dev(pcm, substream),
 				prealloc_buffer_size,
@@ -330,7 +324,6 @@ static const struct snd_soc_component_driver dmaengine_pcm_component = {
 	.open		= dmaengine_pcm_open,
 	.close		= dmaengine_pcm_close,
 	.hw_params	= dmaengine_pcm_hw_params,
-	.hw_free	= dmaengine_pcm_hw_free,
 	.trigger	= dmaengine_pcm_trigger,
 	.pointer	= dmaengine_pcm_pointer,
 	.pcm_construct	= dmaengine_pcm_new,
@@ -342,7 +335,6 @@ static const struct snd_soc_component_driver dmaengine_pcm_component_process = {
 	.open		= dmaengine_pcm_open,
 	.close		= dmaengine_pcm_close,
 	.hw_params	= dmaengine_pcm_hw_params,
-	.hw_free	= dmaengine_pcm_hw_free,
 	.trigger	= dmaengine_pcm_trigger,
 	.pointer	= dmaengine_pcm_pointer,
 	.copy_user	= dmaengine_copy_user,