rust: auxiliary: consider auxiliary devices always have a parent

An auxiliary device is guaranteed to always have a parent device (both
in C and Rust), hence don't return an Option<&auxiliary::Device> in
auxiliary::Device::parent().

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 4 insertions, 3 deletions

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 @@ impl<Ctx: device::DeviceContext> Device<Ctx> {
         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() }
     }
 }