linux-kernel - [PATCH v2] ASoC: amd: acp: Fix incorrect retrival of acp_chip

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Message-ID: <20250910171419.3682468-1-venkataprasad.potturu@amd.com>
Date: Wed, 10 Sep 2025 22:43:59 +0530
From: Venkata Prasad Potturu <venkataprasad.potturu@....com>
To: <broonie@...nel.org>, <alsa-devel@...a-project.org>
CC: <Vijendar.Mukunda@....com>, <Basavaraj.Hiregoudar@....com>,
	<Sunil-kumar.Dommati@....com>, <syed.sabakareem@....com>, "Venkata Prasad
 Potturu" <venkataprasad.potturu@....com>, Liam Girdwood
	<lgirdwood@...il.com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai
	<tiwai@...e.com>, Greg KH <gregkh@...uxfoundation.org>, Ranjani Sridharan
	<ranjani.sridharan@...ux.intel.com>, Daniel Baluta <daniel.baluta@....com>,
	Peter Zijlstra <peterz@...radead.org>, "open list:SOUND - SOC LAYER / DYNAMIC
 AUDIO POWER MANAGEM..." <linux-sound@...r.kernel.org>, open list
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v2] ASoC: amd: acp: Fix incorrect retrival of acp_chip_info

Use dev_get_drvdata(dev->parent) instead of dev_get_platdata(dev)
to correctly obtain acp_chip_info members in the acp I2S driver.
Previously, some members were not updated properly due to incorrect
data access, which could potentially lead to null pointer
dereferences.

This issue was missed in the earlier commit
("ASoC: amd: acp: Fix NULL pointer deref in acp_i2s_set_tdm_slot"),
which only addressed set_tdm_slot(). This change ensures that all
relevant functions correctly retrieve acp_chip_info, preventing
further null pointer dereference issues.

Fixes: e3933683b25e ("ASoC: amd: acp: Remove redundant acp_dev_data structure")

Signed-off-by: Venkata Prasad Potturu <venkataprasad.potturu@....com>

---

Changes since v1:
- Update the commit description.

 sound/soc/amd/acp/acp-i2s.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/sound/soc/amd/acp/acp-i2s.c b/sound/soc/amd/acp/acp-i2s.c
index 617690362ad7..4ba0a66981ea 100644
--- a/sound/soc/amd/acp/acp-i2s.c
+++ b/sound/soc/amd/acp/acp-i2s.c
@@ -73,7 +73,7 @@ static int acp_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
 			   unsigned int fmt)
 {
 	struct device *dev = cpu_dai->component->dev;
-	struct acp_chip_info *chip = dev_get_platdata(dev);
+	struct acp_chip_info *chip = dev_get_drvdata(dev->parent);
 	int mode;
 
 	mode = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
@@ -199,7 +199,7 @@ static int acp_i2s_hwparams(struct snd_pcm_substream *substream, struct snd_pcm_
 	u32 reg_val, fmt_reg, tdm_fmt;
 	u32 lrclk_div_val, bclk_div_val;
 
-	chip = dev_get_platdata(dev);
+	chip = dev_get_drvdata(dev->parent);
 	rsrc = chip->rsrc;
 
 	/* These values are as per Hardware Spec */
@@ -386,7 +386,7 @@ static int acp_i2s_trigger(struct snd_pcm_substream *substream, int cmd, struct
 {
 	struct acp_stream *stream = substream->runtime->private_data;
 	struct device *dev = dai->component->dev;
-	struct acp_chip_info *chip = dev_get_platdata(dev);
+	struct acp_chip_info *chip = dev_get_drvdata(dev->parent);
 	struct acp_resource *rsrc = chip->rsrc;
 	u32 val, period_bytes, reg_val, ier_val, water_val, buf_size, buf_reg;
 
@@ -516,14 +516,13 @@ static int acp_i2s_trigger(struct snd_pcm_substream *substream, int cmd, struct
 static int acp_i2s_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
 {
 	struct device *dev = dai->component->dev;
-	struct acp_chip_info *chip = dev_get_platdata(dev);
+	struct acp_chip_info *chip = dev_get_drvdata(dev->parent);
 	struct acp_resource *rsrc = chip->rsrc;
 	struct acp_stream *stream = substream->runtime->private_data;
 	u32 reg_dma_size = 0, reg_fifo_size = 0, reg_fifo_addr = 0;
 	u32 phy_addr = 0, acp_fifo_addr = 0, ext_int_ctrl;
 	unsigned int dir = substream->stream;
 
-	chip = dev_get_platdata(dev);
 	switch (dai->driver->id) {
 	case I2S_SP_INSTANCE:
 		if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
@@ -632,7 +631,7 @@ static int acp_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_d
 {
 	struct acp_stream *stream = substream->runtime->private_data;
 	struct device *dev = dai->component->dev;
-	struct acp_chip_info *chip = dev_get_platdata(dev);
+	struct acp_chip_info *chip = dev_get_drvdata(dev->parent);
 	struct acp_resource *rsrc = chip->rsrc;
 	unsigned int dir = substream->stream;
 	unsigned int irq_bit = 0;
-- 
2.43.0