ASoC: codecs: rt715-sdca: simplify set_stream

Using a dynamic allocation to store a single pointer is not very
efficient/useful.

Worse, the memory is released in the SoundWire stream.c file, but
still accessed in the DAI shutdown, leading to kmemleak reports.

And last the API requires the previous stream information to be
cleared when the argument is NULL.

Simplify the code to address all 3 problems.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230324014408.1677505-13-yung-chuan.liao@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt715-sdca.c

@@ -784,16 +784,7 @@ static const struct snd_soc_component_driver soc_codec_dev_rt715_sdca = {
 static int rt715_sdca_set_sdw_stream(struct snd_soc_dai *dai, void *sdw_stream,
 				int direction)
 {
-	struct rt715_sdw_stream_data *stream;
-
-	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
-	if (!stream)
-		return -ENOMEM;
-
-	stream->sdw_stream = sdw_stream;
-
-	/* Use tx_mask or rx_mask to configure stream tag and set dma_data */
-	snd_soc_dai_dma_data_set(dai, direction, stream);
+	snd_soc_dai_dma_data_set(dai, direction, sdw_stream);
 
 	return 0;
 }
@@ -802,14 +793,7 @@ static void rt715_sdca_shutdown(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 
 {
-	struct rt715_sdw_stream_data *stream;
-
-	stream = snd_soc_dai_get_dma_data(dai, substream);
-	if (!stream)
-		return;
-
 	snd_soc_dai_set_dma_data(dai, substream, NULL);
-	kfree(stream);
 }
 
 static int rt715_sdca_pcm_hw_params(struct snd_pcm_substream *substream,
@@ -820,13 +804,13 @@ static int rt715_sdca_pcm_hw_params(struct snd_pcm_substream *substream,
 	struct rt715_sdca_priv *rt715 = snd_soc_component_get_drvdata(component);
 	struct sdw_stream_config stream_config = {0};
 	struct sdw_port_config port_config = {0};
-	struct rt715_sdw_stream_data *stream;
+	struct sdw_stream_runtime *sdw_stream;
 	int retval;
 	unsigned int val;
 
-	stream = snd_soc_dai_get_dma_data(dai, substream);
+	sdw_stream = snd_soc_dai_get_dma_data(dai, substream);
 
-	if (!stream)
+	if (!sdw_stream)
 		return -EINVAL;
 
 	if (!rt715->slave)
@@ -851,7 +835,7 @@ static int rt715_sdca_pcm_hw_params(struct snd_pcm_substream *substream,
 	}
 
 	retval = sdw_stream_add_slave(rt715->slave, &stream_config,
-					&port_config, 1, stream->sdw_stream);
+					&port_config, 1, sdw_stream);
 	if (retval) {
 		dev_err(component->dev, "Unable to configure port, retval:%d\n",
 			retval);
@@ -922,13 +906,13 @@ static int rt715_sdca_pcm_hw_free(struct snd_pcm_substream *substream,
 {
 	struct snd_soc_component *component = dai->component;
 	struct rt715_sdca_priv *rt715 = snd_soc_component_get_drvdata(component);
-	struct rt715_sdw_stream_data *stream =
+	struct sdw_stream_runtime *sdw_stream =
 		snd_soc_dai_get_dma_data(dai, substream);
 
 	if (!rt715->slave)
 		return -EINVAL;
 
-	sdw_stream_remove_slave(rt715->slave, stream->sdw_stream);
+	sdw_stream_remove_slave(rt715->slave, sdw_stream);
 	return 0;
 }
 

sound/soc/codecs/rt715-sdca.h

@@ -37,10 +37,6 @@ struct rt715_sdca_priv {
 	int kctl_8ch_orig[8];
 };
 
-struct rt715_sdw_stream_data {
-	struct sdw_stream_runtime *sdw_stream;
-};
-
 struct rt715_sdca_kcontrol_private {
 	unsigned int reg_base;
 	unsigned int count;