[PATCH v2 05/25] rust: pci: implement Sync for Device<Bound>

[Danilo Krummrich <dakr@kernel.org>]

Implement Sync for Device<Bound> in addition to Device<Normal>. The
underlying struct pci_dev is the same; Bound is a zero-sized type-state
marker that does not affect thread safety.

This is needed for pci::Bar to hold &'bound Device<Bound> (required for
Bar::into_devres()) while remaining Send.

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
 rust/kernel/pci.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index fe5148f41d8b..6f82f2e6c74f 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -526,3 +526,7 @@ unsafe impl Send for Device {}
 // SAFETY: `Device` can be shared among threads because all methods of `Device`
 // (i.e. `Device<Normal>) are thread safe.
 unsafe impl Sync for Device {}
+
+// SAFETY: Same as `Device<Normal>` -- the underlying `struct pci_dev` is the same;
+// `Bound` is a zero-sized type-state marker that does not affect thread safety.
+unsafe impl Sync for Device<device::Bound> {}
-- 
2.54.0