From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1637D3B3C00; Wed, 6 May 2026 21:52:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778104336; cv=none; b=MsGspQAXR0S8BU7J2jBRbI9fpL7RFUXcBdRItJSB/Ci7ps9T9exN2HYNpEPFgWUdtJW3sXH90c6qpZ4JPn6IA1jDHE5WTHeuNdBMwJvomeC9YtgR2Xy9iWrczYNhIFM1j35XeGApVjtRPazGuPtwu7JhNP1qtdqAeSub5ae69po= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778104336; c=relaxed/simple; bh=CJzXzWucM829+MDBDBZxsfVoUlMH9RIMYpxWLe+dI5Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OpzoPWyhQ1f3sIOX7wbrGKsF78B6w+Bs4hBPeuGCWcPM+sUkE8lMFiUttpQFGZi7r+z48SXZHrUgYU8MLJLaKvIWF/mDyfPwB3zClaCEGam4ESuasSRbXaGKaerPECCCDgYuSoK5n9kKjMQiUkXGvw9zISkPDsx+CaHwuqnXxu0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gqiWVNkr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gqiWVNkr" 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> Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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