diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs
index 90b9d2d0ec4a..a3b7bd36792c 100644
--- a/drivers/gpu/drm/nova/file.rs
+++ b/drivers/gpu/drm/nova/file.rs
@@ -28,7 +28,7 @@ pub(crate) fn get_param(
         _file: &drm::File<File>,
     ) -> Result<u32> {
         let adev = &dev.adev;
-        let parent = adev.parent().ok_or(ENOENT)?;
+        let parent = adev.parent();
         let pdev: &pci::Device = parent.try_into()?;
 
         let value = match getparam.param as u32 {
diff --git a/rust/kernel/auxiliary.rs b/rust/kernel/auxiliary.rs
index a6a2b23befce..e5bddb738d58 100644
--- a/rust/kernel/auxiliary.rs
+++ b/rust/kernel/auxiliary.rs
@@ -215,9 +215,10 @@ pub fn id(&self) -> u32 {
         unsafe { (*self.as_raw()).id }
     }
 
-    /// Returns a reference to the parent [`device::Device`], if any.
-    pub fn parent(&self) -> Option<&device::Device> {
-        self.as_ref().parent()
+    /// Returns a reference to the parent [`device::Device`].
+    pub fn parent(&self) -> &device::Device {
+        // SAFETY: A `struct auxiliary_device` always has a parent.
+        unsafe { self.as_ref().parent().unwrap_unchecked() }
     }
 }
 
diff --git a/samples/rust/rust_driver_auxiliary.rs b/samples/rust/rust_driver_auxiliary.rs
index 0e221abe4936..2e9afeb83d4f 100644
--- a/samples/rust/rust_driver_auxiliary.rs
+++ b/samples/rust/rust_driver_auxiliary.rs
@@ -68,7 +68,7 @@ fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> impl PinInit<Self, E
 
 impl ParentDriver {
     fn connect(adev: &auxiliary::Device) -> Result<()> {
-        let parent = adev.parent().ok_or(EINVAL)?;
+        let parent = adev.parent();
         let pdev: &pci::Device = parent.try_into()?;
 
         let vendor = pdev.vendor_id();