From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 49906374758; Thu, 21 May 2026 23:40:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779406820; cv=none; b=gckiegH18+9qcJBKBc4oo0jXdzqZEAGbJB0CxYFmoJ20+g3gDi69duKoZX4iiGuN7lYwO4TPd7BxBzvl/fa0Ski3vJl4TmUZaZBAxVboiMp/Kx4Y/qLKp0Ke3xKjeLpoasz7NIsMDWQnNsTfV4wdOFC7WP7qaTNMH7XGLa2y3g4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779406820; c=relaxed/simple; bh=qTF5Y6aKb7spGXK8meoI5pO/KT/AWjwpH/fzWjglAfA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=niMprz7aQrMmUJ9VI1aNi/SHBR4kLwVv0AOi1TO1wKJQBcTHXou47BnzPU8JtuiO1t5iA4aaz3+iESoG1u58hR18GMJ5vLsqhv3a3OD+3sGLVHm0+T9odF1mw/oAbOkf9Beyz+kcAhylLLBSVfxiSZuFp58cqZxhhevT48W36ps= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k7zjIvWd; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="k7zjIvWd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B6971F00A3B; Thu, 21 May 2026 23:40:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779406814; bh=ggJY/UJJUIurxIjGS19alaA47Bxd3KuWm+WJgDSyvC0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=k7zjIvWd+VGBCSOvUB86+/MHTdB2856fFXG9wO030mFsM1A99tCNEpFMmgGcwOrvH 44r/pHNRp4ruC80cSDkePGveT0NqDmh9OpQX8RZIZpcYZBdNm+or0xOOV+3rE5DNDG OU2uCgfW6CbzJ9fE4j5B4MvUIXwnybq1UuUTSxYPMMKfpuo/VZ+En/8NqHGoFpPVW+ UPsh+gVmNckJtDgAG0TRJjEXGdFbRhK6NOFyZnQzI44MA5tgIXZ1S5dme7t8d4NM1O fJqAY43w5dpLjN55VwUndsv0L91SXR0De/zlc8GczmH70e27kit8z3drjWx51VnZmF GeTUTOjroaKLw== 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, pcolberg@redhat.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 v4 08/27] rust: usb: implement Sync for Device Date: Fri, 22 May 2026 01:34:34 +0200 Message-ID: <20260521233501.1191842-9-dakr@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260521233501.1191842-1-dakr@kernel.org> References: <20260521233501.1191842-1-dakr@kernel.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement Sync for Device in addition to Device. 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 private data while remaining Send. Reviewed-by: Alexandre Courbot Reviewed-by: Gary Guo 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 88721970afcb..6c917d8fa883 100644 --- a/rust/kernel/usb.rs +++ b/rust/kernel/usb.rs @@ -468,6 +468,10 @@ 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