[PATCH 1/4] rust: revocable: support fallible PinInit types

[Danilo Krummrich <dakr@kernel.org>]

Currently, Revocable::new() only supports infallible PinInit
implementations, i.e. impl PinInit<T, Infallible>.

This has been sufficient so far, since users such as Devres do not
support fallibility.

Since this is about to change, make Revocable::new() generic over the
error type E.

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 rust/kernel/devres.rs    | 2 +-
 rust/kernel/revocable.rs | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/devres.rs b/rust/kernel/devres.rs
index d8bdf2bdb879..a7df9fbd724f 100644
--- a/rust/kernel/devres.rs
+++ b/rust/kernel/devres.rs
@@ -98,7 +98,7 @@ struct DevresInner<T> {
 impl<T> DevresInner<T> {
     fn new(dev: &Device<Bound>, data: T, flags: Flags) -> Result<Arc<DevresInner<T>>> {
         let inner = Arc::pin_init(
-            pin_init!( DevresInner {
+            try_pin_init!( DevresInner {
                 dev: dev.into(),
                 callback: Self::devres_callback,
                 data <- Revocable::new(data),
diff --git a/rust/kernel/revocable.rs b/rust/kernel/revocable.rs
index fa1fd70efa27..41b8fe374af6 100644
--- a/rust/kernel/revocable.rs
+++ b/rust/kernel/revocable.rs
@@ -82,8 +82,11 @@ unsafe impl<T: Sync + Send> Sync for Revocable<T> {}
 
 impl<T> Revocable<T> {
     /// Creates a new revocable instance of the given data.
-    pub fn new(data: impl PinInit<T>) -> impl PinInit<Self> {
-        pin_init!(Self {
+    pub fn new<E>(data: impl PinInit<T, E>) -> impl PinInit<Self, Error>
+    where
+        Error: From<E>,
+    {
+        try_pin_init!(Self {
             is_available: AtomicBool::new(true),
             data <- Opaque::pin_init(data),
         })
-- 
2.49.0