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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,
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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 v3 08/27] rust: usb: implement Sync for Device<Bound>
Date: Sun, 17 May 2026 02:00:56 +0200
Message-ID: <20260517000149.3226762-9-dakr@kernel.org>
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Implement Sync for Device<Bound> in addition to Device<Normal>.

Device<Bound> uses the same underlying struct usb_device 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 usb::Device<Bound> in their
private data while remaining Send.

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

diff --git a/rust/kernel/usb.rs b/rust/kernel/usb.rs
index 794abe06f5bd..995221d327b8 100644
--- a/rust/kernel/usb.rs
+++ b/rust/kernel/usb.rs
@@ -468,6 +468,10 @@ unsafe impl Send for Device {}
 // allow any mutation through a shared reference.
 unsafe impl Sync for Device {}
 
+// SAFETY: Same as `Device<Normal>` -- the underlying `struct usb_device` is the same;
+// `Bound` is a zero-sized type-state marker that does not affect thread safety.
+unsafe impl Sync for Device<device::Bound> {}
+
 /// Declares a kernel module that exposes a single USB driver.
 ///
 /// # Examples
-- 
2.54.0