diff --git a/vhost-device-sound/src/audio_backends/alsa.rs b/vhost-device-sound/src/audio_backends/alsa.rs
index b61b786..7a6bd95 100644
--- a/vhost-device-sound/src/audio_backends/alsa.rs
+++ b/vhost-device-sound/src/audio_backends/alsa.rs
@@ -654,7 +654,7 @@ impl AudioBackend for AlsaBackend {
             .write()
             .unwrap()
             .get_mut(id as usize)
-            .ok_or_else(|| Error::StreamWithIdNotFound(id))?
+            .ok_or(Error::StreamWithIdNotFound(id))?
             .state
             .stop()
         {
diff --git a/vhost-device-sound/src/audio_backends/null.rs b/vhost-device-sound/src/audio_backends/null.rs
index 0eedbf1..97078ff 100644
--- a/vhost-device-sound/src/audio_backends/null.rs
+++ b/vhost-device-sound/src/audio_backends/null.rs
@@ -10,7 +10,7 @@ pub struct NullBackend {
 }
 
 impl NullBackend {
-    pub fn new(streams: Arc<RwLock<Vec<Stream>>>) -> Self {
+    pub const fn new(streams: Arc<RwLock<Vec<Stream>>>) -> Self {
         Self { streams }
     }
 }
diff --git a/vhost-device-sound/src/audio_backends/pipewire.rs b/vhost-device-sound/src/audio_backends/pipewire.rs
index dedcf5b..32f989d 100644
--- a/vhost-device-sound/src/audio_backends/pipewire.rs
+++ b/vhost-device-sound/src/audio_backends/pipewire.rs
@@ -195,7 +195,7 @@ impl AudioBackend for PwBackend {
             .write()
             .unwrap()
             .get_mut(stream_id as usize)
-            .ok_or_else(|| Error::StreamWithIdNotFound(stream_id))?
+            .ok_or(Error::StreamWithIdNotFound(stream_id))?
             .state
             .prepare();
         if let Err(err) = prepare_result {
@@ -500,7 +500,7 @@ impl AudioBackend for PwBackend {
             .write()
             .unwrap()
             .get_mut(stream_id as usize)
-            .ok_or_else(|| Error::StreamWithIdNotFound(stream_id))?
+            .ok_or(Error::StreamWithIdNotFound(stream_id))?
             .state
             .release();
         if let Err(err) = release_result {
@@ -529,7 +529,7 @@ impl AudioBackend for PwBackend {
             .write()
             .unwrap()
             .get_mut(stream_id as usize)
-            .ok_or_else(|| Error::StreamWithIdNotFound(stream_id))?
+            .ok_or(Error::StreamWithIdNotFound(stream_id))?
             .state
             .start();
         if let Err(err) = start_result {
@@ -554,7 +554,7 @@ impl AudioBackend for PwBackend {
             .write()
             .unwrap()
             .get_mut(stream_id as usize)
-            .ok_or_else(|| Error::StreamWithIdNotFound(stream_id))?
+            .ok_or(Error::StreamWithIdNotFound(stream_id))?
             .state
             .stop();
         if let Err(err) = stop_result {
diff --git a/vhost-device-sound/src/device.rs b/vhost-device-sound/src/device.rs
index 5fea9ea..3d7db21 100644
--- a/vhost-device-sound/src/device.rs
+++ b/vhost-device-sound/src/device.rs
@@ -92,11 +92,11 @@ impl VhostUserSoundThread {
     ) -> IoResult<()> {
         let vring = &vrings
             .get(device_event as usize)
-            .ok_or_else(|| Error::HandleUnknownEvent(device_event))?;
+            .ok_or(Error::HandleUnknownEvent(device_event))?;
         let queue_idx = self
             .queue_indexes
             .get(device_event as usize)
-            .ok_or_else(|| Error::HandleUnknownEvent(device_event))?;
+            .ok_or(Error::HandleUnknownEvent(device_event))?;
         if self.event_idx {
             // vm-virtio's Queue implementation only checks avail_index
             // once, so to properly support EVENT_IDX we need to keep
diff --git a/vhost-device-sound/src/stream.rs b/vhost-device-sound/src/stream.rs
index d33f066..53d2140 100644
--- a/vhost-device-sound/src/stream.rs
+++ b/vhost-device-sound/src/stream.rs
@@ -266,7 +266,7 @@ impl std::fmt::Debug for Request {
 }
 
 impl Request {
-    pub fn new(len: usize, message: Arc<IOMessage>, direction: Direction) -> Self {
+    pub const fn new(len: usize, message: Arc<IOMessage>, direction: Direction) -> Self {
         Self {
             pos: 0,
             len,