[PATCH] ASoC: qcom: sc7280: Fix missing Soundwire runtime stream alloc

[Krzysztof Kozlowski]

Commit 15c7fab0e047 ("ASoC: qcom: Move Soundwire runtime stream alloc to
soundcards") moved the allocation of Soundwire stream runtime from the
Qualcomm Soundwire driver to each individual machine sound card driver,
except that it forgot to update SC7280 card.

Just like for other Qualcomm sound cards using Soundwire, the card
driver should allocate and release the runtime.  Otherwise sound
playback will result in a NULL pointer dereference or other effect of
uninitialized memory accesses (which was confirmed on SDM845 having
similar issue).

Cc: stable@xxxxxxxxxxxxxxx
Cc: Alexey Klimov <alexey.klimov@xxxxxxxxxx>
Cc: Steev Klimaszewski <steev@xxxxxxxx>
Fixes: 15c7fab0e047 ("ASoC: qcom: Move Soundwire runtime stream alloc to soundcards")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>

---

Not tested on hardware. The sc7280 sound card differs a bit from the
ones I am working on, thus please kindly test and confirm.  Without the
patch KASAN should show something similar to:
https://lore.kernel.org/linux-sound/20241009213922.999355-1-alexey.klimov@xxxxxxxxxx/T/#u

The patch should fix it.
---
 sound/soc/qcom/sc7280.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/sound/soc/qcom/sc7280.c b/sound/soc/qcom/sc7280.c
index 207ac5da4dd4..230af8d7b205 100644
--- a/sound/soc/qcom/sc7280.c
+++ b/sound/soc/qcom/sc7280.c
@@ -23,6 +23,7 @@
 #include "common.h"
 #include "lpass.h"
 #include "qdsp6/q6afe.h"
+#include "sdw.h"
 
 #define DEFAULT_MCLK_RATE              19200000
 #define RT5682_PLL_FREQ (48000 * 512)
@@ -316,6 +317,7 @@ static void sc7280_snd_shutdown(struct snd_pcm_substream *substream)
 	struct snd_soc_card *card = rtd->card;
 	struct sc7280_snd_data *data = snd_soc_card_get_drvdata(card);
 	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+	struct sdw_stream_runtime *sruntime = data->sruntime[cpu_dai->id];
 
 	switch (cpu_dai->id) {
 	case MI2S_PRIMARY:
@@ -333,6 +335,9 @@ static void sc7280_snd_shutdown(struct snd_pcm_substream *substream)
 	default:
 		break;
 	}
+
+	data->sruntime[cpu_dai->id] = NULL;
+	sdw_release_stream(sruntime);
 }
 
 static int sc7280_snd_startup(struct snd_pcm_substream *substream)
@@ -347,6 +352,8 @@ static int sc7280_snd_startup(struct snd_pcm_substream *substream)
 	switch (cpu_dai->id) {
 	case MI2S_PRIMARY:
 		ret = sc7280_rt5682_init(rtd);
+		if (ret)
+			return ret;
 		break;
 	case SECONDARY_MI2S_RX:
 		codec_dai_fmt |= SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_I2S;
@@ -360,7 +367,8 @@ static int sc7280_snd_startup(struct snd_pcm_substream *substream)
 	default:
 		break;
 	}
-	return ret;
+
+	return qcom_snd_sdw_startup(substream);
 }
 
 static const struct snd_soc_ops sc7280_ops = {
-- 
2.43.0