linux-kernel - [PATCH 1/1] ASoC: simple-card-utils: fix priv->dai

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Message-Id: <20250114184314.3583-2-laurentiumihalcea111@gmail.com>
Date: Tue, 14 Jan 2025 13:43:14 -0500
From: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
To: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>
Cc: linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] ASoC: simple-card-utils: fix priv->dai_props indexing

From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>

As of commit cb18cd26039f ("ASoC: soc-core: do rtd->id trick at
snd_soc_add_pcm_runtime()") the ID stored in the PCM runtime data can
no longer be safely used to index the priv->dai_props array. This is
because the ID may be modified during snd_soc_add_pcm_runtime(), thus
resulting in an ID that's no longer a valid array index.

To fix this, use the position of the dai_link stored inside the PCM
runtime data relative to the start of the dai_link array as index into
the priv->dai_props array.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
---
 include/sound/simple_card_utils.h     |  7 +++++++
 sound/soc/generic/simple-card-utils.c | 10 +++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index f6bfd485c31a..892f70532363 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -89,6 +89,13 @@ struct simple_util_priv {
 #define simple_props_to_dai_codec(props, i)	((props)->codec_dai + i)
 #define simple_props_to_codec_conf(props, i)	((props)->codec_conf + i)
 
+/* has the same effect as simple_priv_to_props(). Preferred over
+ * simple_priv_to_props() when dealing with PCM runtime data as
+ * the ID stored in rtd->id may not be a valid array index.
+ */
+#define runtime_simple_priv_to_props(priv, rtd)				\
+	((priv)->dai_props + ((rtd)->dai_link - (priv)->dai_link))
+
 #define for_each_prop_dlc_cpus(props, i, cpu)				\
 	for ((i) = 0;							\
 	     ((i) < (props)->num.cpus) &&				\
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index e25b387a9776..dd414634b4ac 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -295,7 +295,7 @@ int simple_util_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 	struct simple_util_priv *priv = snd_soc_card_get_drvdata(rtd->card);
-	struct simple_dai_props *props = simple_priv_to_props(priv, rtd->id);
+	struct simple_dai_props *props = runtime_simple_priv_to_props(priv, rtd);
 	struct simple_util_dai *dai;
 	unsigned int fixed_sysclk = 0;
 	int i1, i2, i;
@@ -356,7 +356,7 @@ void simple_util_shutdown(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 	struct simple_util_priv *priv = snd_soc_card_get_drvdata(rtd->card);
-	struct simple_dai_props *props = simple_priv_to_props(priv, rtd->id);
+	struct simple_dai_props *props = runtime_simple_priv_to_props(priv, rtd);
 	struct simple_util_dai *dai;
 	int i;
 
@@ -445,7 +445,7 @@ int simple_util_hw_params(struct snd_pcm_substream *substream,
 	struct simple_util_dai *pdai;
 	struct snd_soc_dai *sdai;
 	struct simple_util_priv *priv = snd_soc_card_get_drvdata(rtd->card);
-	struct simple_dai_props *props = simple_priv_to_props(priv, rtd->id);
+	struct simple_dai_props *props = runtime_simple_priv_to_props(priv, rtd);
 	unsigned int mclk, mclk_fs = 0;
 	int i, ret;
 
@@ -516,7 +516,7 @@ int simple_util_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 				   struct snd_pcm_hw_params *params)
 {
 	struct simple_util_priv *priv = snd_soc_card_get_drvdata(rtd->card);
-	struct simple_dai_props *dai_props = simple_priv_to_props(priv, rtd->id);
+	struct simple_dai_props *dai_props = runtime_simple_priv_to_props(priv, rtd);
 	struct simple_util_data *data = &dai_props->adata;
 	struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 	struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
@@ -627,7 +627,7 @@ static int simple_init_for_codec2codec(struct snd_soc_pcm_runtime *rtd,
 int simple_util_dai_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct simple_util_priv *priv = snd_soc_card_get_drvdata(rtd->card);
-	struct simple_dai_props *props = simple_priv_to_props(priv, rtd->id);
+	struct simple_dai_props *props = runtime_simple_priv_to_props(priv, rtd);
 	struct simple_util_dai *dai;
 	int i, ret;
 
-- 
2.34.1