ASoC: codecs: max98373-sdw: 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/20230324014408.1677505-4-yung-chuan.liao@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98373-sdw.c

@@ -20,10 +20,6 @@
 #include "max98373.h"
 #include "max98373-sdw.h"
 
-struct sdw_stream_data {
-	struct sdw_stream_runtime *sdw_stream;
-};
-
 static const u32 max98373_sdw_cache_reg[] = {
 	MAX98373_R2054_MEAS_ADC_PVDD_CH_READBACK,
 	MAX98373_R2055_MEAS_ADC_THERM_CH_READBACK,
@@ -536,12 +532,12 @@ static int max98373_sdw_dai_hw_params(struct snd_pcm_substream *substream,
 		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;
 	int ret, chan_sz, sampling_rate;
 
-	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 (!max98373->slave)
@@ -565,7 +561,7 @@ static int max98373_sdw_dai_hw_params(struct snd_pcm_substream *substream,
 	}
 
 	ret = sdw_stream_add_slave(max98373->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");
 		return ret;
@@ -664,32 +660,20 @@ static int max98373_pcm_hw_free(struct snd_pcm_substream *substream,
 	struct snd_soc_component *component = dai->component;
 	struct max98373_priv *max98373 =
 		snd_soc_component_get_drvdata(component);
-	struct sdw_stream_data *stream =
+	struct sdw_stream_runtime *sdw_stream =
 		snd_soc_dai_get_dma_data(dai, substream);
 
 	if (!max98373->slave)
 		return -EINVAL;
 
-	sdw_stream_remove_slave(max98373->slave, stream->sdw_stream);
+	sdw_stream_remove_slave(max98373->slave, sdw_stream);
 	return 0;
 }
 
 static int max98373_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;
 }
@@ -697,11 +681,7 @@ static int max98373_set_sdw_stream(struct snd_soc_dai *dai,
 static void max98373_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 max98373_sdw_set_tdm_slot(struct snd_soc_dai *dai,