diff --git a/rust/kernel/drm/device.rs b/rust/kernel/drm/device.rs
index 97e2b3de78bc..d4521ef8ed80 100644
--- a/rust/kernel/drm/device.rs
+++ b/rust/kernel/drm/device.rs
@@ -450,11 +450,15 @@ unsafe fn dec_ref(obj: NonNull<Self>) {
     }
 }
 
-impl<T: drm::Driver, C: DeviceContext> AsRef<device::Device> for Device<T, C> {
-    fn as_ref(&self) -> &device::Device {
+impl<T: drm::Driver> AsRef<T::ParentDevice<device::Normal>> for Device<T> {
+    fn as_ref(&self) -> &T::ParentDevice<device::Normal> {
         // SAFETY: `bindings::drm_device::dev` is valid as long as the DRM device itself is valid,
         // which is guaranteed by the type invariant.
-        unsafe { device::Device::from_raw((*self.as_raw()).dev) }
+        let dev = unsafe { device::Device::from_raw((*self.as_raw()).dev) };
+
+        // SAFETY: The DRM device was constructed in `UnregisteredDevice::new()` with a parent
+        // device of type `T::ParentDevice`, hence `dev` is contained in a `T::ParentDevice`.
+        unsafe { device::AsBusDevice::from_device(dev) }
     }
 }
 
diff --git a/rust/kernel/drm/driver.rs b/rust/kernel/drm/driver.rs
index 3cda8dceb498..9ba2eba84191 100644
--- a/rust/kernel/drm/driver.rs
+++ b/rust/kernel/drm/driver.rs
@@ -170,7 +170,8 @@ pub fn new_foreign_owned<'a>(
     where
         T: 'static,
     {
-        if drm.as_ref().as_raw() != dev.as_raw() {
+        let parent = drm.as_ref();
+        if parent.as_ref().as_raw() != dev.as_raw() {
             return Err(EINVAL);
         }
 
diff --git a/rust/kernel/drm/gem/shmem.rs b/rust/kernel/drm/gem/shmem.rs
index e0ef47352e88..c1d82a04878b 100644
--- a/rust/kernel/drm/gem/shmem.rs
+++ b/rust/kernel/drm/gem/shmem.rs
@@ -264,7 +264,8 @@ pub fn sg_table<'a>(
         &'a self,
         dev: &'a device::Device<Bound>,
     ) -> Result<&'a scatterlist::SGTable> {
-        if dev.as_raw() != self.dev().as_ref().as_raw() {
+        let parent = self.dev().as_ref();
+        if dev.as_raw() != parent.as_ref().as_raw() {
             return Err(EINVAL);
         }