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rust: device: 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 device as Device<Normal>;
Bound is a zero-sized type-state marker that does not affect thread
safety.

This is needed for types that hold &'bound Device<Bound>, such as
io::mem::IoMem, to be 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/20260525202921.124698-11-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Danilo Krummrich
2026-05-25 22:20:57 +02:00
parent 3bb1655192
commit de12e48a1b
1 changed files with 4 additions and 0 deletions
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4
rust/kernel/device.rs
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@@ -467,6 +467,10 @@ unsafe impl Send for Device {}
// synchronization in `struct device`.
unsafe impl Sync for Device {}
// SAFETY: Same as `Device<Normal>` -- the underlying `struct device` is the same; `Bound` is a
// zero-sized type-state marker that does not affect thread safety.
unsafe impl Sync for Device<Bound> {}
/// Marker trait for the context or scope of a bus specific device.
///
/// [`DeviceContext`] is a marker trait for types representing the context of a bus specific