ASoC: codecs: sdw-mockup: 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/20230324014408.1677505-3-yung-chuan.liao@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/sdw-mockup.c

@@ -23,10 +23,6 @@ struct  sdw_mockup_priv {
 	struct sdw_slave *slave;
 };
 
-struct sdw_stream_data {
-	struct sdw_stream_runtime *sdw_stream;
-};
-
 static int sdw_mockup_component_probe(struct snd_soc_component *component)
 {
 	return 0;
@@ -45,19 +41,7 @@ static const struct snd_soc_component_driver snd_soc_sdw_mockup_component = {
 static int sdw_mockup_set_sdw_stream(struct snd_soc_dai *dai, void *sdw_stream,
 				     int direction)
 {
-	struct sdw_stream_data *stream;
-
-	if (!sdw_stream)
-		return 0;
-
-	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;
 }
@@ -65,11 +49,7 @@ static int sdw_mockup_set_sdw_stream(struct snd_soc_dai *dai, void *sdw_stream,
 static void sdw_mockup_shutdown(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
-	struct sdw_stream_data *stream;
-
-	stream = snd_soc_dai_get_dma_data(dai, substream);
 	snd_soc_dai_set_dma_data(dai, substream, NULL);
-	kfree(stream);
 }
 
 static int sdw_mockup_pcm_hw_params(struct snd_pcm_substream *substream,
@@ -80,11 +60,10 @@ static int sdw_mockup_pcm_hw_params(struct snd_pcm_substream *substream,
 	struct sdw_mockup_priv *sdw_mockup = snd_soc_component_get_drvdata(component);
 	struct sdw_stream_config stream_config = {0};
 	struct sdw_port_config port_config = {0};
-	struct sdw_stream_data *stream;
+	struct sdw_stream_runtime *sdw_stream = snd_soc_dai_get_dma_data(dai, substream);
 	int ret;
 
-	stream = snd_soc_dai_get_dma_data(dai, substream);
-	if (!stream)
+	if (!sdw_stream)
 		return -EINVAL;
 
 	if (!sdw_mockup->slave)
@@ -99,7 +78,7 @@ static int sdw_mockup_pcm_hw_params(struct snd_pcm_substream *substream,
 		port_config.num = 8;
 
 	ret = sdw_stream_add_slave(sdw_mockup->slave, &stream_config,
-				   &port_config, 1, stream->sdw_stream);
+				   &port_config, 1, sdw_stream);
 	if (ret)
 		dev_err(dai->dev, "Unable to configure port\n");
 
@@ -111,13 +90,12 @@ static int sdw_mockup_pcm_hw_free(struct snd_pcm_substream *substream,
 {
 	struct snd_soc_component *component = dai->component;
 	struct sdw_mockup_priv *sdw_mockup = snd_soc_component_get_drvdata(component);
-	struct sdw_stream_data *stream =
-		snd_soc_dai_get_dma_data(dai, substream);
+	struct sdw_stream_runtime *sdw_stream = snd_soc_dai_get_dma_data(dai, substream);
 
 	if (!sdw_mockup->slave)
 		return -EINVAL;
 
-	sdw_stream_remove_slave(sdw_mockup->slave, stream->sdw_stream);
+	sdw_stream_remove_slave(sdw_mockup->slave, sdw_stream);
 	return 0;
 }