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From: Danilo Krummrich <dakr@kernel.org>
To: gregkh@linuxfoundation.org, rafael@kernel.org, acourbot@nvidia.com,
 aliceryhl@google.com, david.m.ertman@intel.com, ira.weiny@intel.com,
 leon@kernel.org, viresh.kumar@linaro.org, m.wilczynski@samsung.com,
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Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org,
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 Danilo Krummrich <dakr@kernel.org>
Subject: [PATCH v4 05/27] rust: pci: implement Sync for Device<Bound>
Date: Fri, 22 May 2026 01:34:31 +0200
Message-ID: <20260521233501.1191842-6-dakr@kernel.org>
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Implement Sync for Device<Bound> in addition to Device<Normal>.

Device<Bound> uses the same underlying struct pci_dev as Device<Normal>;
Bound is a zero-sized type-state marker that does not affect thread
safety.

This is needed for drivers to store &'bound pci::Device<Bound> in their
private data while remaining Send.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
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 c743f2abb62f..d214a861375d 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -528,3 +528,7 @@ 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