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rust: usb: implement Sync for Device<Bound>

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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.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Uwe Kleine-König <ukleinek@kernel.org>
Tested-by: Dirk Behme <dirk.behme@de.bosch.com>
Link: https://patch.msgid.link/20260525202921.124698-10-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Danilo Krummrich 2026-05-25 22:20:56 +02:00
parent 5bbcefe8db
commit 3bb1655192
1 changed files with 4 additions and 0 deletions
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4
rust/kernel/usb.rs
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@ -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