diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index 5f0e2dc96769..0aaa64b189da 100644
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -1375,7 +1375,7 @@ static const struct loopback_ops loopback_snd_timer_ops = {
 	.dpcm_info = loopback_snd_timer_dpcm_info,
 };
 
-static int loopback_open(struct snd_pcm_substream *substream)
+static int __loopback_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct loopback *loopback = substream->private_data;
@@ -1384,7 +1384,6 @@ static int loopback_open(struct snd_pcm_substream *substream)
 	int err = 0;
 	int dev = get_cable_index(substream);
 
-	guard(mutex)(&loopback->cable_lock);
 	dpcm = kzalloc_obj(*dpcm);
 	if (!dpcm)
 		return -ENOMEM;
@@ -1479,6 +1478,14 @@ static int loopback_open(struct snd_pcm_substream *substream)
 	return err;
 }
 
+static int loopback_open(struct snd_pcm_substream *substream)
+{
+	struct loopback *loopback = substream->private_data;
+
+	guard(mutex)(&loopback->cable_lock);
+	return __loopback_open(substream);
+}
+
 static int loopback_close(struct snd_pcm_substream *substream)
 {
 	struct loopback *loopback = substream->private_data;