From: Danilo Krummrich <dakr@kernel.org>
Date: Sun, 13 Apr 2025 17:36:59 +0000 (+0200)
Subject: rust: platform: preserve device context in AsRef
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=da6c47c6cb45ffb392e016631c08098ad2a6d418;p=users%2Fhch%2Fmisc.git

rust: platform: preserve device context in AsRef

Since device::Device has a generic over its context, preserve this
device context in AsRef.

For instance, when calling platform::Device<Core> the new AsRef
implementation returns device::Device<Core>.

Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20250413173758.12068-5-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---

diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs
index 9476b717c425..b1c48cd95cd6 100644
--- a/rust/kernel/platform.rs
+++ b/rust/kernel/platform.rs
@@ -183,7 +183,7 @@ pub struct Device<Ctx: device::DeviceContext = device::Normal>(
     PhantomData<Ctx>,
 );
 
-impl Device {
+impl<Ctx: device::DeviceContext> Device<Ctx> {
     fn as_raw(&self) -> *mut bindings::platform_device {
         self.0.get()
     }
@@ -207,8 +207,8 @@ unsafe impl crate::types::AlwaysRefCounted for Device {
     }
 }
 
-impl AsRef<device::Device> for Device {
-    fn as_ref(&self) -> &device::Device {
+impl<Ctx: device::DeviceContext> AsRef<device::Device<Ctx>> for Device<Ctx> {
+    fn as_ref(&self) -> &device::Device<Ctx> {
         // SAFETY: By the type invariant of `Self`, `self.as_raw()` is a pointer to a valid
         // `struct platform_device`.
         let dev = unsafe { addr_of_mut!((*self.as_raw()).dev) };