rust: device: narrow the generic of drvdata_obtain()

Let T be the actual private driver data type without the surrounding
box, as it leaves less room for potential bugs.

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, 2 insertions, 2 deletions

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index 343996027c89..106aa57a6385 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -215,7 +215,7 @@ impl Device<CoreInternal> {
     /// - Must only be called once after a preceding call to [`Device::set_drvdata`].
     /// - The type `T` must match the type of the `ForeignOwnable` previously stored by
     ///   [`Device::set_drvdata`].
-    pub unsafe fn drvdata_obtain<T: ForeignOwnable>(&self) -> T {
+    pub unsafe fn drvdata_obtain<T: 'static>(&self) -> Pin<KBox<T>> {
         // SAFETY: By the type invariants, `self.as_raw()` is a valid pointer to a `struct device`.
         let ptr = unsafe { bindings::dev_get_drvdata(self.as_raw()) };
 
@@ -224,7 +224,7 @@ impl Device<CoreInternal> {
         //   `into_foreign()`.
         // - `dev_get_drvdata()` guarantees to return the same pointer given to `dev_set_drvdata()`
         //   in `into_foreign()`.
-        unsafe { T::from_foreign(ptr.cast()) }
+        unsafe { Pin::<KBox<T>>::from_foreign(ptr.cast()) }
     }
 
     /// Borrow the driver's private data bound to this [`Device`].