[PATCH 5/9] rust: workqueue: make OwnedQueue thread-safe

[Mike Lothian]

OwnedQueue only owns a pointer to Queue, whose operations are already
Send and Sync. Propagate those guarantees so drivers can keep an
owned queue in shared device state.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Mike Lothian <mike@xxxxxxxxxxxxxx>
---
 rust/kernel/workqueue/mod.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rust/kernel/workqueue/mod.rs b/rust/kernel/workqueue/mod.rs
index e30c21214a81..000a29c9dc1a 100644
--- a/rust/kernel/workqueue/mod.rs
+++ b/rust/kernel/workqueue/mod.rs
@@ -380,6 +380,12 @@ pub struct OwnedQueue {
     queue: NonNull<Queue>,
 }
 
+// SAFETY: `Queue` operations are thread-safe and ownership may be transferred
+// between threads.
+unsafe impl Send for OwnedQueue {}
+// SAFETY: Shared access only exposes the thread-safe `Queue` API.
+unsafe impl Sync for OwnedQueue {}
+
 impl Deref for OwnedQueue {
     type Target = Queue;
     fn deref(&self) -> &Queue {