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.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20251103203053.2348783-1-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files 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 @@ impl Device<device::Bound> {
         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 @@ impl Device<device::Bound> {
         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.