ASoC: codecs: rt1318-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/20230324014408.1677505-7-yung-chuan.liao@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt1318-sdw.c

@@ -562,19 +562,7 @@ static const struct snd_soc_dapm_route rt1318_dapm_routes[] = {
 static int rt1318_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;
 }
@@ -582,11 +570,7 @@ static int rt1318_set_sdw_stream(struct snd_soc_dai *dai, void *sdw_stream,
 static void rt1318_sdw_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 rt1318_sdw_hw_params(struct snd_pcm_substream *substream,
@@ -598,14 +582,14 @@ static int rt1318_sdw_hw_params(struct snd_pcm_substream *substream,
 	struct sdw_stream_config stream_config;
 	struct sdw_port_config port_config;
 	enum sdw_data_direction direction;
-	struct sdw_stream_data *stream;
+	struct sdw_stream_runtime *sdw_stream;
 	int retval, port, num_channels, ch_mask;
 	unsigned int sampling_rate;
 
 	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 (!rt1318->sdw_slave)
@@ -633,7 +617,7 @@ static int rt1318_sdw_hw_params(struct snd_pcm_substream *substream,
 	port_config.num = port;
 
 	retval = sdw_stream_add_slave(rt1318->sdw_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;
@@ -679,13 +663,13 @@ static int rt1318_sdw_pcm_hw_free(struct snd_pcm_substream *substream,
 	struct snd_soc_component *component = dai->component;
 	struct rt1318_sdw_priv *rt1318 =
 		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 (!rt1318->sdw_slave)
 		return -EINVAL;
 
-	sdw_stream_remove_slave(rt1318->sdw_slave, stream->sdw_stream);
+	sdw_stream_remove_slave(rt1318->sdw_slave, sdw_stream);
 	return 0;
 }
 

sound/soc/codecs/rt1318-sdw.h

@@ -94,8 +94,4 @@ struct rt1318_sdw_priv {
 	bool first_hw_init;
 };
 
-struct sdw_stream_data {
-	struct sdw_stream_runtime *sdw_stream;
-};
-
 #endif /* __RT1318_SDW_H__ */