Device::parent() returns a reference to the device' parent device, if
any.
Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
---
rust/kernel/device.rs | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index 21b343a1dc4d..f6bdc2646028 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -65,6 +65,21 @@ pub(crate) fn as_raw(&self) -> *mut bindings::device {
self.0.get()
}
+ /// Returns a reference to the parent device, if any.
+ pub fn parent<'a>(&self) -> Option<&'a Self> {
+ // SAFETY:
+ // - By the type invariant `self.as_raw()` is always valid.
+ // - The parent device is only ever set at device creation.
+ let parent = unsafe { (*self.as_raw()).parent };
+
+ if parent.is_null() {
+ None
+ } else {
+ // SAFETY: Since `parent` is not NULL, it must be a valid pointer to a `struct device`.
+ Some(unsafe { Self::as_ref(parent) })
+ }
+ }
+
/// Convert a raw C `struct device` pointer to a `&'a Device`.
///
/// # Safety
--
2.48.1
