[PATCH 2/2] rust: platform: get rid of redundant Result in IRQ methods

[Danilo Krummrich <dakr@kernel.org>]

Currently request_irq_by_index() 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 the other IRQ methods.

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

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 rust/kernel/platform.rs | 42 ++++++++++++++++++++++-------------------
 1 file changed, 23 insertions(+), 19 deletions(-)

diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs
index 8f7522c4cf89..f4b617c570be 100644
--- a/rust/kernel/platform.rs
+++ b/rust/kernel/platform.rs
@@ -301,15 +301,17 @@ pub fn $fn_name<'a, T: irq::$handler_trait + 'static>(
             index: u32,
             name: &'static CStr,
             handler: impl PinInit<T, Error> + 'a,
-        ) -> Result<impl PinInit<irq::$reg_type<T>, Error> + 'a> {
-            let request = self.$request_fn(index)?;
-
-            Ok(irq::$reg_type::<T>::new(
-                request,
-                flags,
-                name,
-                handler,
-            ))
+        ) -> impl PinInit<irq::$reg_type<T>, Error> + 'a {
+            pin_init::pin_init_scope(move || {
+                let request = self.$request_fn(index)?;
+
+                Ok(irq::$reg_type::<T>::new(
+                    request,
+                    flags,
+                    name,
+                    handler,
+                ))
+            })
         }
     };
 }
@@ -325,18 +327,20 @@ macro_rules! define_irq_accessor_by_name {
         pub fn $fn_name<'a, T: irq::$handler_trait + 'static>(
             &'a self,
             flags: irq::Flags,
-            irq_name: &CStr,
+            irq_name: &'a CStr,
             name: &'static CStr,
             handler: impl PinInit<T, Error> + 'a,
-        ) -> Result<impl PinInit<irq::$reg_type<T>, Error> + 'a> {
-            let request = self.$request_fn(irq_name)?;
-
-            Ok(irq::$reg_type::<T>::new(
-                request,
-                flags,
-                name,
-                handler,
-            ))
+        ) -> impl PinInit<irq::$reg_type<T>, Error> + 'a {
+            pin_init::pin_init_scope(move || {
+                let request = self.$request_fn(irq_name)?;
+
+                Ok(irq::$reg_type::<T>::new(
+                    request,
+                    flags,
+                    name,
+                    handler,
+                ))
+            })
         }
     };
 }
-- 
2.51.0