ASoC: codecs: rt700-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/20230324014408.1677505-8-yung-chuan.liao@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt700.c

@@ -875,19 +875,7 @@ static const struct snd_soc_component_driver soc_codec_dev_rt700 = {
 static int rt700_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;
 }
@@ -895,11 +883,7 @@ static int rt700_set_sdw_stream(struct snd_soc_dai *dai, void *sdw_stream,
 static void rt700_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 rt700_pcm_hw_params(struct snd_pcm_substream *substream,
@@ -910,14 +894,14 @@ static int rt700_pcm_hw_params(struct snd_pcm_substream *substream,
 	struct rt700_priv *rt700 = 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 retval;
 	unsigned int val = 0;
 
 	dev_dbg(dai->dev, "%s %s", __func__, dai->name);
-	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 (!rt700->slave)
@@ -944,7 +928,7 @@ static int rt700_pcm_hw_params(struct snd_pcm_substream *substream,
 	}
 
 	retval = sdw_stream_add_slave(rt700->slave, &stream_config,
-					&port_config, 1, stream->sdw_stream);
+					&port_config, 1, sdw_stream);
 	if (retval) {
 		dev_err(dai->dev, "Unable to configure port\n");
 		return retval;
@@ -991,13 +975,13 @@ static int rt700_pcm_hw_free(struct snd_pcm_substream *substream,
 {
 	struct snd_soc_component *component = dai->component;
 	struct rt700_priv *rt700 = 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 (!rt700->slave)
 		return -EINVAL;
 
-	sdw_stream_remove_slave(rt700->slave, stream->sdw_stream);
+	sdw_stream_remove_slave(rt700->slave, sdw_stream);
 	return 0;
 }
 

sound/soc/codecs/rt700.h

@@ -27,10 +27,6 @@ struct  rt700_priv {
 	bool disable_irq;
 };
 
-struct sdw_stream_data {
-	struct sdw_stream_runtime *sdw_stream;
-};
-
 /* NID */
 #define RT700_AUDIO_FUNCTION_GROUP			0x01
 #define RT700_DAC_OUT1					0x02