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[v3,1/3] rust: clk: implement Send and Sync

Message ID 20251218-clk-send-sync-v3-1-e48b2e2f1eac@google.com
State Superseded
Delegated to: Michał Wilczyński
Headers show
Series Implement Send and Sync for clk | expand

Commit Message

Alice Ryhl Dec. 18, 2025, 1:27 p.m. UTC 
These traits are required for drivers to embed the Clk type in their own
data structures because driver data structures are usually required to
be Send. Since the Clk type is thread-safe, implement the relevant
traits.

Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
 rust/kernel/clk.rs | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/rust/kernel/clk.rs b/rust/kernel/clk.rs
index c1cfaeaa36a22be2e3180b1e9142bb608ab276ea..d192fbd97861212d738d24510eebcd99c9177f2c 100644
--- a/rust/kernel/clk.rs
+++ b/rust/kernel/clk.rs
@@ -129,6 +129,13 @@  mod common_clk {
     #[repr(transparent)]
     pub struct Clk(*mut bindings::clk);
 
+    // SAFETY: It is safe to call `clk_put` on another thread than where `clk_get` was called.
+    unsafe impl Send for Clk {}
+
+    // SAFETY: It is safe to call any combination of the `&self` methods in parallel, as the
+    // methods are synchronized internally.
+    unsafe impl Sync for Clk {}
+
     impl Clk {
         /// Gets [`Clk`] corresponding to a [`Device`] and a connection id.
         ///