linux-kernel - [PATCH 6/8] rust: auxiliary: implement parent() for Device<Bound>

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Message-ID: <20251020223516.241050-7-dakr@kernel.org>
Date: Tue, 21 Oct 2025 00:34:28 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: gregkh@...uxfoundation.org,
	rafael@...nel.org,
	bhelgaas@...gle.com,
	kwilczynski@...nel.org,
	david.m.ertman@...el.com,
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	alex.gaynor@...il.com,
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	tmgross@...ch.edu,
	pcolberg@...hat.com
Cc: rust-for-linux@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 6/8] rust: auxiliary: implement parent() for Device<Bound>

Take advantage of the fact that if the auxiliary device is bound the
parent is guaranteed to be bound as well and implement a separate
parent() method for auxiliary::Device<Bound>.

Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/kernel/auxiliary.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/rust/kernel/auxiliary.rs b/rust/kernel/auxiliary.rs
index 497601f7473b..cc67fa5ddde3 100644
--- a/rust/kernel/auxiliary.rs
+++ b/rust/kernel/auxiliary.rs
@@ -217,6 +217,16 @@ pub fn id(&self) -> u32 {
     }
 }
 
+impl Device<device::Bound> {
+    /// Returns a bound reference to the parent [`device::Device`].
+    pub fn parent(&self) -> &device::Device<device::Bound> {
+        let parent = (**self).parent();
+
+        // SAFETY: A bound auxiliary device always has a bound parent device.
+        unsafe { parent.as_bound() }
+    }
+}
+
 impl Device {
     /// Returns a reference to the parent [`device::Device`].
     pub fn parent(&self) -> &device::Device {
-- 
2.51.0