[PATCH v2 1/5] rust: phy: implement `Send` for `Registration`

From: Wedson Almeida Filho <wedsonaf@gmail.com>
To: rust-for-linux@vger.kernel.org
Cc: "Miguel Ojeda" <ojeda@kernel.org>,
	"Alex Gaynor" <alex.gaynor@gmail.com>,
	"Boqun Feng" <boqun.feng@gmail.com>,
	"Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
	"Benno Lossin" <benno.lossin@proton.me>,
	"Andreas Hindborg" <a.hindborg@samsung.com>,
	"Alice Ryhl" <aliceryhl@google.com>,
	linux-kernel@vger.kernel.org,
	"Wedson Almeida Filho" <walmeida@microsoft.com>,
	"FUJITA Tomonori" <fujita.tomonori@gmail.com>,
	"Trevor Gross" <tmgross@umich.edu>,
	netdev@vger.kernel.org
Subject: [PATCH v2 1/5] rust: phy: implement `Send` for `Registration`
Date: Thu, 28 Mar 2024 16:54:53 -0300	[thread overview]
Message-ID: <20240328195457.225001-2-wedsonaf@gmail.com> (raw)
In-Reply-To: <20240328195457.225001-1-wedsonaf@gmail.com>

From: Wedson Almeida Filho <walmeida@microsoft.com>

In preparation for requiring `Send` for `Module` implementations in the
next patch.

Cc: FUJITA Tomonori <fujita.tomonori@gmail.com>
Cc: Trevor Gross <tmgross@umich.edu>
Cc: netdev@vger.kernel.org
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
---
 rust/kernel/net/phy.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
index 96e09c6e8530..265d0e1c1371 100644
--- a/rust/kernel/net/phy.rs
+++ b/rust/kernel/net/phy.rs
@@ -640,6 +640,10 @@ pub struct Registration {
     drivers: Pin<&'static mut [DriverVTable]>,
 }
 
+// SAFETY: The only action allowed in a `Registration` instance is dropping it, which is safe to do
+// from any thread because `phy_drivers_unregister` can be called from any thread context.
+unsafe impl Send for Registration {}
+
 impl Registration {
     /// Registers a PHY driver.
     pub fn register(
-- 
2.34.1

