linux-kernel - [PATCH 1/2] rust: pci: get rid of redundant Result in IRQ methods

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Message-ID: <20251103203053.2348783-1-dakr@kernel.org>
Date: Mon,  3 Nov 2025 21:30:12 +0100
From: Danilo Krummrich <dakr@...nel.org>
To: bhelgaas@...gle.com,
	kwilczynski@...nel.org,
	gregkh@...uxfoundation.org,
	rafael@...nel.org,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	lossin@...nel.org,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu
Cc: linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 1/2] rust: pci: get rid of redundant Result in IRQ methods

Currently request_irq() returns

	Result<impl PinInit<irq::Registration<T>, Error> + 'a>

which may carry an error in the Result or the initializer; the same is
true for request_threaded_irq().

Use pin_init::pin_init_scope() to get rid of this redundancy.

Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/kernel/pci/irq.rs | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/rust/kernel/pci/irq.rs b/rust/kernel/pci/irq.rs
index 782a524fe11c..03f2de559a8a 100644
--- a/rust/kernel/pci/irq.rs
+++ b/rust/kernel/pci/irq.rs
@@ -175,10 +175,12 @@ pub fn request_irq<'a, T: crate::irq::Handler + 'static>(
         flags: irq::Flags,
         name: &'static CStr,
         handler: impl PinInit<T, Error> + 'a,
-    ) -> Result<impl PinInit<irq::Registration<T>, Error> + 'a> {
-        let request = vector.try_into()?;
+    ) -> impl PinInit<irq::Registration<T>, Error> + 'a {
+        pin_init::pin_init_scope(move || {
+            let request = vector.try_into()?;
 
-        Ok(irq::Registration::<T>::new(request, flags, name, handler))
+            Ok(irq::Registration::<T>::new(request, flags, name, handler))
+        })
     }
 
     /// Returns a [`kernel::irq::ThreadedRegistration`] for the given IRQ vector.
@@ -188,12 +190,14 @@ pub fn request_threaded_irq<'a, T: crate::irq::ThreadedHandler + 'static>(
         flags: irq::Flags,
         name: &'static CStr,
         handler: impl PinInit<T, Error> + 'a,
-    ) -> Result<impl PinInit<irq::ThreadedRegistration<T>, Error> + 'a> {
-        let request = vector.try_into()?;
-
-        Ok(irq::ThreadedRegistration::<T>::new(
-            request, flags, name, handler,
-        ))
+    ) -> impl PinInit<irq::ThreadedRegistration<T>, Error> + 'a {
+        pin_init::pin_init_scope(move || {
+            let request = vector.try_into()?;
+
+            Ok(irq::ThreadedRegistration::<T>::new(
+                request, flags, name, handler,
+            ))
+        })
     }
 
     /// Allocate IRQ vectors for this PCI device with automatic cleanup.
-- 
2.51.0