From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E8AF5CD342C for ; Wed, 6 May 2026 22:00:25 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 60FE189D7C; Wed, 6 May 2026 22:00:25 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="gqiWVNkr"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id B5F7389D7C for ; Wed, 6 May 2026 22:00:24 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 0408760181; Wed, 6 May 2026 21:52:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F378C2BCB2; Wed, 6 May 2026 21:52:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778104335; bh=CJzXzWucM829+MDBDBZxsfVoUlMH9RIMYpxWLe+dI5Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gqiWVNkrOAoUEQgxyKxXgOhRxSopfd85M2KuZiGUg3Q9+CBan75GNvs50HVzvOT/2 QyUOlNTGtIV7uCejdqwiTzlDr8pe4WmFWjdkJdfstXxPIQCZs31DpJYiuNOCO0ZU+o D+mxt5xuFZc6VV7kzDwV7C0FPzGBoqJz/4zX91UXjgL9AinumpyM+GljwaZ1To6Acr Kg+UklkEy6NjaBYwVCYK3o+dOAIUDi1MeboX+ama+VPAzdxGvMzgl6c/IDTWGHMEtD LyCuPWtyucJb96lH/hMXT6YjMflOSTyafjXudZtyitRHVl01VLNA6139XR4sAOA+ve n/DB5C2AVPBKA== From: Danilo Krummrich To: gregkh@linuxfoundation.org, rafael@kernel.org, acourbot@nvidia.com, aliceryhl@google.com, david.m.ertman@intel.com, ira.weiny@intel.com, leon@kernel.org, viresh.kumar@linaro.org, m.wilczynski@samsung.com, ukleinek@kernel.org, bhelgaas@google.com, kwilczynski@kernel.org, abdiel.janulgue@gmail.com, robin.murphy@arm.com, markus.probst@posteo.de, ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, igor.korotin@linux.dev, daniel.almeida@collabora.com Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, nova-gpu@lists.linux.dev, dri-devel@lists.freedesktop.org, linux-pm@vger.kernel.org, linux-pwm@vger.kernel.org, linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, Danilo Krummrich Subject: [PATCH v2 08/25] rust: usb: implement Sync for Device Date: Wed, 6 May 2026 23:50:44 +0200 Message-ID: <20260506215113.851360-9-dakr@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260506215113.851360-1-dakr@kernel.org> References: <20260506215113.851360-1-dakr@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Device uses the same underlying struct usb_device as Device; Bound is a zero-sized type-state marker that does not affect thread safety. This is needed for drivers to store &'bound usb::Device in their HRT private data while remaining Send. Signed-off-by: Danilo Krummrich --- rust/kernel/usb.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/rust/kernel/usb.rs b/rust/kernel/usb.rs index 9b9d3ae41087..442e456fd2d3 100644 --- a/rust/kernel/usb.rs +++ b/rust/kernel/usb.rs @@ -467,6 +467,10 @@ unsafe impl Send for Device {} // allow any mutation through a shared reference. unsafe impl Sync for Device {} +// SAFETY: Same as `Device` -- 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 {} + /// Declares a kernel module that exposes a single USB driver. /// /// # Examples -- 2.54.0