1 files changed, 16 insertions, 0 deletions
diff --git a/rust/kernel/revocable.rs b/rust/kernel/revocable.rs
index 1e5a9d25c21b..971d0dc38d83 100644
--- a/rust/kernel/revocable.rs
+++ b/rust/kernel/revocable.rs
@@ -123,6 +123,22 @@ impl<T> Revocable<T> {
         }
     }
 
+    /// Tries to access the wrapped object and run a closure on it while the guard is held.
+    ///
+    /// This is a convenience method to run short non-sleepable code blocks while ensuring the
+    /// guard is dropped afterwards. [`Self::try_access`] carries the risk that the caller will
+    /// forget to explicitly drop that returned guard before calling sleepable code; this method
+    /// adds an extra safety to make sure it doesn't happen.
+    ///
+    /// Returns [`None`] if the object has been revoked and is therefore no longer accessible, or
+    /// the result of the closure wrapped in [`Some`]. If the closure returns a [`Result`] then the
+    /// return type becomes `Option<Result<>>`, which can be inconvenient. Users are encouraged to
+    /// define their own macro that turns the [`Option`] into a proper error code and flattens the
+    /// inner result into it if it makes sense within their subsystem.
+    pub fn try_access_with<R, F: FnOnce(&T) -> R>(&self, f: F) -> Option<R> {
+        self.try_access().map(|t| f(&*t))
+    }
+
     /// # Safety
     ///
     /// Callers must ensure that there are no more concurrent users of the revocable object.