rt712_sdca_dmic_set_gain_get() and rt712_sdca_dmic_set_gain_put() take
the component drvdata as struct rt712_sdca_priv, but this driver stores
a struct rt712_sdca_dmic_priv.

regmap and mbq_regmap are at the same offsets in both structs, so the
register accesses work. slave is not: rt712_sdca_priv has dmic_component
in front of it, so its slave overlays rt712_sdca_dmic_priv's params,
which this driver never writes. When regmap_write() fails in the put
handler, dev_err() is called with &NULL->dev (RSI below):

  rt712-sdca-dmic sdw:0:3:025d:1713:01: Defer on undeferrable control: 40800f13
  BUG: kernel NULL pointer dereference, address: 0000000000000058
  RIP: 0010:__dev_printk+0x10/0x70
  RDX: ffffcdac45f83cd0 RSI: 0000000000000008 RDI: ffffffffa09cb5cb
  Call Trace:
   _dev_err+0x7f/0x99
   rt712_sdca_dmic_set_gain_put.cold+0x20/0x25 [snd_soc_rt712_sdca_dmic]
   snd_ctl_elem_write+0x19a/0x1f0 [snd]
   snd_ctl_ioctl+0x658/0x8a0 [snd]

Seen on a Dell Precision 5690 running 7.2.5-200.fc44, with alsactl
writing the control during boot. Compile-tested only.

Fixes: 63a511284c9e ("ASoC: rt712-sdca: Add RT712 SDCA driver for Mic topology")
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2532834
Cc: stable@vger.kernel.org
Signed-off-by: Junjie Cao <junjie.cao@intel.com>
---
 sound/soc/codecs/rt712-sdca-dmic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/rt712-sdca-dmic.c b/sound/soc/codecs/rt712-sdca-dmic.c
index a9f3aa4e143ae..882390890738e 100644
--- a/sound/soc/codecs/rt712-sdca-dmic.c
+++ b/sound/soc/codecs/rt712-sdca-dmic.c
@@ -246,7 +246,7 @@ static int rt712_sdca_dmic_set_gain_get(struct snd_kcontrol *kcontrol,
 		struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
-	struct rt712_sdca_priv *rt712 = snd_soc_component_get_drvdata(component);
+	struct rt712_sdca_dmic_priv *rt712 = snd_soc_component_get_drvdata(component);
 	struct rt712_sdca_dmic_kctrl_priv *p =
 		(struct rt712_sdca_dmic_kctrl_priv *)kcontrol->private_value;
 	unsigned int regvalue, ctl, i;
@@ -277,7 +277,7 @@ static int rt712_sdca_dmic_set_gain_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
 	struct rt712_sdca_dmic_kctrl_priv *p =
 		(struct rt712_sdca_dmic_kctrl_priv *)kcontrol->private_value;
-	struct rt712_sdca_priv *rt712 = snd_soc_component_get_drvdata(component);
+	struct rt712_sdca_dmic_priv *rt712 = snd_soc_component_get_drvdata(component);
 	unsigned int gain_val[4];
 	unsigned int i, adc_vol_flag = 0, changed = 0;
 	unsigned int regvalue[4];

base-commit: 174d160884199cad97413f33fe1b56027dc0d3e1
-- 
2.43.0