diff --git a/sound/hda/common/codec.c b/sound/hda/common/codec.c
index 09b1329bb8f3..5123df32ad89 100644
--- a/sound/hda/common/codec.c
+++ b/sound/hda/common/codec.c
@@ -2529,7 +2529,10 @@ EXPORT_SYMBOL_GPL(snd_hda_spdif_ctls_assign);
 static int spdif_share_sw_get(struct snd_kcontrol *kcontrol,
 			      struct snd_ctl_elem_value *ucontrol)
 {
-	struct hda_multi_out *mout = snd_kcontrol_chip(kcontrol);
+	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct hda_multi_out *mout = (void *)kcontrol->private_value;
+
+	guard(mutex)(&codec->spdif_mutex);
 	ucontrol->value.integer.value[0] = mout->share_spdif;
 	return 0;
 }
@@ -2537,9 +2540,15 @@ static int spdif_share_sw_get(struct snd_kcontrol *kcontrol,
 static int spdif_share_sw_put(struct snd_kcontrol *kcontrol,
 			      struct snd_ctl_elem_value *ucontrol)
 {
-	struct hda_multi_out *mout = snd_kcontrol_chip(kcontrol);
-	mout->share_spdif = !!ucontrol->value.integer.value[0];
-	return 0;
+	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct hda_multi_out *mout = (void *)kcontrol->private_value;
+	bool val = !!ucontrol->value.integer.value[0];
+	int change;
+
+	guard(mutex)(&codec->spdif_mutex);
+	change = mout->share_spdif != val;
+	mout->share_spdif = val;
+	return change;
 }
 
 static const struct snd_kcontrol_new spdif_share_sw = {
@@ -2550,6 +2559,14 @@ static const struct snd_kcontrol_new spdif_share_sw = {
 	.put = spdif_share_sw_put,
 };
 
+static void notify_spdif_share_sw(struct hda_codec *codec,
+				  struct hda_multi_out *mout)
+{
+	if (mout->share_spdif_kctl)
+		snd_ctl_notify_one(codec->card, SNDRV_CTL_EVENT_MASK_VALUE,
+				   mout->share_spdif_kctl, 0);
+}
+
 /**
  * snd_hda_create_spdif_share_sw - create Default PCM switch
  * @codec: the HDA codec
@@ -2559,15 +2576,24 @@ int snd_hda_create_spdif_share_sw(struct hda_codec *codec,
 				  struct hda_multi_out *mout)
 {
 	struct snd_kcontrol *kctl;
+	int err;
 
 	if (!mout->dig_out_nid)
 		return 0;
 
-	kctl = snd_ctl_new1(&spdif_share_sw, mout);
+	kctl = snd_ctl_new1(&spdif_share_sw, codec);
 	if (!kctl)
 		return -ENOMEM;
-	/* ATTENTION: here mout is passed as private_data, instead of codec */
-	return snd_hda_ctl_add(codec, mout->dig_out_nid, kctl);
+	/* snd_ctl_new1() stores @codec in private_data; stash @mout in
+	 * private_value for the share-switch callbacks and cache the
+	 * assigned control for forced-disable notifications.
+	 */
+	kctl->private_value = (unsigned long)mout;
+	err = snd_hda_ctl_add(codec, mout->dig_out_nid, kctl);
+	if (err < 0)
+		return err;
+	mout->share_spdif_kctl = kctl;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hda_create_spdif_share_sw);
 
@@ -3701,6 +3727,8 @@ int snd_hda_multi_out_analog_open(struct hda_codec *codec,
 				  struct hda_pcm_stream *hinfo)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
+	bool notify_share_sw = false;
+
 	runtime->hw.channels_max = mout->max_channels;
 	if (mout->dig_out_nid) {
 		if (!mout->analog_rates) {
@@ -3729,10 +3757,12 @@ int snd_hda_multi_out_analog_open(struct hda_codec *codec,
 					hinfo->maxbps = mout->spdif_maxbps;
 			} else {
 				mout->share_spdif = 0;
-				/* FIXME: need notify? */
+				notify_share_sw = true;
 			}
 		}
 	}
+	if (notify_share_sw)
+		notify_spdif_share_sw(codec, mout);
 	return snd_pcm_hw_constraint_step(substream->runtime, 0,
 					  SNDRV_PCM_HW_PARAM_CHANNELS, 2);
 }
diff --git a/sound/hda/common/hda_local.h b/sound/hda/common/hda_local.h
index ab423f1cef54..98b2c4acebc2 100644
--- a/sound/hda/common/hda_local.h
+++ b/sound/hda/common/hda_local.h
@@ -221,6 +221,7 @@ struct hda_multi_out {
 	unsigned int spdif_rates;
 	unsigned int spdif_maxbps;
 	u64 spdif_formats;
+	struct snd_kcontrol *share_spdif_kctl; /* cached shared SPDIF switch */
 };
 
 int snd_hda_create_spdif_share_sw(struct hda_codec *codec,