linux-kernel - [PATCH 5/9] rust: pci: preserve device context in AsRef

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Message-ID: <20250331202805.338468-6-dakr@kernel.org>
Date: Mon, 31 Mar 2025 22:27:58 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: bhelgaas@...gle.com,
	gregkh@...uxfoundation.org,
	rafael@...nel.org,
	abdiel.janulgue@...il.com
Cc: ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
	daniel.almeida@...labora.com,
	robin.murphy@....com,
	linux-pci@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 5/9] rust: pci: preserve device context in AsRef

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

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

Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/kernel/pci.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index e235aa23c63a..de140cce13cf 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -360,11 +360,13 @@ fn deref(&self) -> &Self::Target {
     }
 }
 
-impl Device {
+impl<Ctx: device::DeviceContext> Device<Ctx> {
     fn as_raw(&self) -> *mut bindings::pci_dev {
         self.0.get()
     }
+}
 
+impl Device {
     /// Returns the PCI vendor ID.
     pub fn vendor_id(&self) -> u16 {
         // SAFETY: `self.as_raw` is a valid pointer to a `struct pci_dev`.
@@ -438,8 +440,8 @@ unsafe fn dec_ref(obj: NonNull<Self>) {
     }
 }
 
-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 pci_dev`.
         let dev = unsafe { addr_of_mut!((*self.as_raw()).dev) };
-- 
2.49.0