diff --git a/sound/firewire/oxfw/oxfw-hwdep.c b/sound/firewire/oxfw/oxfw-hwdep.c
index 3be214d8a922..f8ac362fc73a 100644
--- a/sound/firewire/oxfw/oxfw-hwdep.c
+++ b/sound/firewire/oxfw/oxfw-hwdep.c
@@ -53,18 +53,14 @@ static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
 			       poll_table *wait)
 {
 	struct snd_oxfw *oxfw = hwdep->private_data;
-	__poll_t events;
 
 	poll_wait(file, &oxfw->hwdep_wait, wait);
 
-	spin_lock_irq(&oxfw->lock);
+	guard(spinlock_irq)(&oxfw->lock);
 	if (oxfw->dev_lock_changed)
-		events = EPOLLIN | EPOLLRDNORM;
+		return EPOLLIN | EPOLLRDNORM;
 	else
-		events = 0;
-	spin_unlock_irq(&oxfw->lock);
-
-	return events;
+		return 0;
 }
 
 static int hwdep_get_info(struct snd_oxfw *oxfw, void __user *arg)
@@ -88,48 +84,35 @@ static int hwdep_get_info(struct snd_oxfw *oxfw, void __user *arg)
 
 static int hwdep_lock(struct snd_oxfw *oxfw)
 {
-	int err;
-
-	spin_lock_irq(&oxfw->lock);
+	guard(spinlock_irq)(&oxfw->lock);
 
 	if (oxfw->dev_lock_count == 0) {
 		oxfw->dev_lock_count = -1;
-		err = 0;
+		return 0;
 	} else {
-		err = -EBUSY;
+		return -EBUSY;
 	}
-
-	spin_unlock_irq(&oxfw->lock);
-
-	return err;
 }
 
 static int hwdep_unlock(struct snd_oxfw *oxfw)
 {
-	int err;
-
-	spin_lock_irq(&oxfw->lock);
+	guard(spinlock_irq)(&oxfw->lock);
 
 	if (oxfw->dev_lock_count == -1) {
 		oxfw->dev_lock_count = 0;
-		err = 0;
+		return 0;
 	} else {
-		err = -EBADFD;
+		return -EBADFD;
 	}
-
-	spin_unlock_irq(&oxfw->lock);
-
-	return err;
 }
 
 static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
 {
 	struct snd_oxfw *oxfw = hwdep->private_data;
 
-	spin_lock_irq(&oxfw->lock);
+	guard(spinlock_irq)(&oxfw->lock);
 	if (oxfw->dev_lock_count == -1)
 		oxfw->dev_lock_count = 0;
-	spin_unlock_irq(&oxfw->lock);
 
 	return 0;
 }
diff --git a/sound/firewire/oxfw/oxfw-midi.c b/sound/firewire/oxfw/oxfw-midi.c
index 7f757f02a877..a16bf885f918 100644
--- a/sound/firewire/oxfw/oxfw-midi.c
+++ b/sound/firewire/oxfw/oxfw-midi.c
@@ -84,9 +84,8 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
 {
 	struct snd_oxfw *oxfw = substrm->rmidi->private_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&oxfw->lock, flags);
+	guard(spinlock_irqsave)(&oxfw->lock);
 
 	if (up)
 		amdtp_am824_midi_trigger(&oxfw->tx_stream,
@@ -94,16 +93,13 @@ static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
 	else
 		amdtp_am824_midi_trigger(&oxfw->tx_stream,
 					 substrm->number, NULL);
-
-	spin_unlock_irqrestore(&oxfw->lock, flags);
 }
 
 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
 {
 	struct snd_oxfw *oxfw = substrm->rmidi->private_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&oxfw->lock, flags);
+	guard(spinlock_irqsave)(&oxfw->lock);
 
 	if (up)
 		amdtp_am824_midi_trigger(&oxfw->rx_stream,
@@ -111,8 +107,6 @@ static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
 	else
 		amdtp_am824_midi_trigger(&oxfw->rx_stream,
 					 substrm->number, NULL);
-
-	spin_unlock_irqrestore(&oxfw->lock, flags);
 }
 
 static void set_midi_substream_names(struct snd_oxfw *oxfw,
diff --git a/sound/firewire/oxfw/oxfw-stream.c b/sound/firewire/oxfw/oxfw-stream.c
index 00f7feb91f92..5e36d7153a7b 100644
--- a/sound/firewire/oxfw/oxfw-stream.c
+++ b/sound/firewire/oxfw/oxfw-stream.c
@@ -866,33 +866,24 @@ void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
 
 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
 {
-	int err;
-
-	spin_lock_irq(&oxfw->lock);
+	guard(spinlock_irq)(&oxfw->lock);
 
 	/* user land lock this */
-	if (oxfw->dev_lock_count < 0) {
-		err = -EBUSY;
-		goto end;
-	}
+	if (oxfw->dev_lock_count < 0)
+		return -EBUSY;
 
 	/* this is the first time */
 	if (oxfw->dev_lock_count++ == 0)
 		snd_oxfw_stream_lock_changed(oxfw);
-	err = 0;
-end:
-	spin_unlock_irq(&oxfw->lock);
-	return err;
+	return 0;
 }
 
 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
 {
-	spin_lock_irq(&oxfw->lock);
+	guard(spinlock_irq)(&oxfw->lock);
 
 	if (WARN_ON(oxfw->dev_lock_count <= 0))
-		goto end;
+		return;
 	if (--oxfw->dev_lock_count == 0)
 		snd_oxfw_stream_lock_changed(oxfw);
-end:
-	spin_unlock_irq(&oxfw->lock);
 }