linux-kernel - [RFC PATCH] ASoC: soc-dai: don't call PCM audio ops if the stream is not supported

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Date:   Thu, 13 Jul 2023 11:52:58 +0200
From:   Peter Suti <peter.suti@...eamunlimited.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     pierre-louis.bossart@...ux.intel.com,
        Peter Suti <peter.suti@...eamunlimited.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH] ASoC: soc-dai: don't call PCM audio ops if the stream is not supported

PCM audio ops may be called when the stream is not supported.
We should not call the ops in that case to avoid unexpected behavior.

hw_params is handled already in soc-pcm.c

[0] https://lore.kernel.org/alsa-devel/ae06b00a-f3f7-f9d1-0b58-4d71f3394416@linux.intel.com/T/#t

Signed-off-by: Peter Suti <peter.suti@...eamunlimited.com>
---
Tested on 6.1 Compile tested on next/master
 sound/soc/soc-dai.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/soc-dai.c b/sound/soc/soc-dai.c
index 02dd64dea179..73a97ac6ccb8 100644
--- a/sound/soc/soc-dai.c
+++ b/sound/soc/soc-dai.c
@@ -424,6 +424,9 @@ int snd_soc_dai_startup(struct snd_soc_dai *dai,
 {
 	int ret = 0;
 
+	if (!snd_soc_dai_stream_valid(dai, substream->stream))
+		return 0;
+
 	if (dai->driver->ops &&
 	    dai->driver->ops->startup)
 		ret = dai->driver->ops->startup(substream, dai);
@@ -439,6 +442,9 @@ void snd_soc_dai_shutdown(struct snd_soc_dai *dai,
 			  struct snd_pcm_substream *substream,
 			  int rollback)
 {
+	if (!snd_soc_dai_stream_valid(dai, substream->stream))
+		return;
+
 	if (rollback && !soc_dai_mark_match(dai, substream, startup))
 		return;
 
@@ -603,6 +609,8 @@ int snd_soc_pcm_dai_prepare(struct snd_pcm_substream *substream)
 	int i, ret;
 
 	for_each_rtd_dais(rtd, i, dai) {
+		if (!snd_soc_dai_stream_valid(dai, substream->stream))
+			continue;
 		if (dai->driver->ops &&
 		    dai->driver->ops->prepare) {
 			ret = dai->driver->ops->prepare(substream, dai);
@@ -619,6 +627,9 @@ static int soc_dai_trigger(struct snd_soc_dai *dai,
 {
 	int ret = 0;
 
+	if (!snd_soc_dai_stream_valid(dai, substream->stream))
+		return 0;
+
 	if (dai->driver->ops &&
 	    dai->driver->ops->trigger)
 		ret = dai->driver->ops->trigger(substream, cmd, dai);
-- 
2.34.1