{"id":2229227,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2229227/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pwm/patch/20260427221155.2144848-16-dakr@kernel.org/","project":{"id":38,"url":"http://patchwork.ozlabs.org/api/1.1/projects/38/?format=json","name":"Linux PWM development","link_name":"linux-pwm","list_id":"linux-pwm.vger.kernel.org","list_email":"linux-pwm@vger.kernel.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260427221155.2144848-16-dakr@kernel.org>","date":"2026-04-27T22:11:13","name":"[15/24] samples: rust: rust_driver_auxiliary: showcase lifetime-bound registration data","commit_ref":null,"pull_url":null,"state":"handled-elsewhere","archived":false,"hash":"fd2c3e20de1023317248762a06bb667a62c86a15","submitter":{"id":89037,"url":"http://patchwork.ozlabs.org/api/1.1/people/89037/?format=json","name":"Danilo Krummrich","email":"dakr@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pwm/patch/20260427221155.2144848-16-dakr@kernel.org/mbox/","series":[{"id":501734,"url":"http://patchwork.ozlabs.org/api/1.1/series/501734/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pwm/list/?series=501734","date":"2026-04-27T22:10:58","name":"rust: device: Higher-Ranked Lifetime Types for device drivers","version":1,"mbox":"http://patchwork.ozlabs.org/series/501734/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2229227/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2229227/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pwm@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=bQGkmtrf;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777328023; cv=none;\n b=fJ8fw+/C34HBqOmBFpYleI6RD1nNzE6uElZDsKBwKgCxlJS9EM+UEUsZIiTzXmJDpX32MbRiuxpQMN+BfwQRM3zKPQCB6np5iPEIWxUdIQEE1E0AR7tYxrFrOB+UrUGTXCZRa0MxMx0ZBtaQejw4SA0vw/Ji64xA4ILNkV+VB1g=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777328023; c=relaxed/simple;\n\tbh=2wRXyoiGYh3N2MxiZpU0KF0q9rWzHw+tYKK7qMjArxI=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=XUtQ/LpuHQDpAulOw0wjA6UL49pDxH8dTTEWrxc+ILv1DWyG+di8EMRy52My61fI9Ns1N8Oo4iCwNUsaBfaqYtf0aS3wTpSGpu/wQm/UOh1zdH88IUm5s7u3UeuE6+8Amh+HWpbk83rCFF+wRtXkfFuAHZa/7uhOsXJTGVO0KJo=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=bQGkmtrf; arc=none smtp.client-ip=10.30.226.201","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777328022;\n\tbh=2wRXyoiGYh3N2MxiZpU0KF0q9rWzHw+tYKK7qMjArxI=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=bQGkmtrfaOtuV8b1phg4BUOsZwWTo2RGRcZLJkJvxY84H0cAgrv0s1WFxR7FvnQPj\n\t ZyV6+O/clFd90kJOW/a6ltyel9t5FglZoFE7lOoOvdCaPUhymgXpKBERhilzisUgqC\n\t q9PSC0MCU0EbI2JsqE/QK8UpsIl6OsePWv8QIPYrjpQH3CnHf/CqbVmSR62Y8L7paX\n\t ikOJQb763jtz56W4bgS+DdXbeJSEIgbEf6wkWgGB1AiVQvPgusJYtdMLrk/X6at2sT\n\t DhlAAhBweOysTvimZ87GnzvOYsJzx5XiFgU+j03r4Jcmf2ueM6wTgzwbUFClsoJp/C\n\t nz1bJk/e+RWJQ==","From":"Danilo Krummrich ","To":"gregkh@linuxfoundation.org,\n\trafael@kernel.org,\n\tacourbot@nvidia.com,\n\taliceryhl@google.com,\n\tdavid.m.ertman@intel.com,\n\tira.weiny@intel.com,\n\tleon@kernel.org,\n\tviresh.kumar@linaro.org,\n\tm.wilczynski@samsung.com,\n\tukleinek@kernel.org,\n\tbhelgaas@google.com,\n\tkwilczynski@kernel.org,\n\tabdiel.janulgue@gmail.com,\n\trobin.murphy@arm.com,\n\tmarkus.probst@posteo.de,\n\tojeda@kernel.org,\n\tboqun@kernel.org,\n\tgary@garyguo.net,\n\tbjorn3_gh@protonmail.com,\n\tlossin@kernel.org,\n\ta.hindborg@kernel.org,\n\ttmgross@umich.edu","Cc":"driver-core@lists.linux.dev,\n\tlinux-kernel@vger.kernel.org,\n\tnova-gpu@lists.linux.dev,\n\tdri-devel@lists.freedesktop.org,\n\tlinux-pm@vger.kernel.org,\n\tlinux-pwm@vger.kernel.org,\n\tlinux-pci@vger.kernel.org,\n\trust-for-linux@vger.kernel.org,\n\tDanilo Krummrich ","Subject":"[PATCH 15/24] samples: rust: rust_driver_auxiliary: showcase\n lifetime-bound registration data","Date":"Tue, 28 Apr 2026 00:11:13 +0200","Message-ID":"<20260427221155.2144848-16-dakr@kernel.org>","X-Mailer":"git-send-email 2.54.0","In-Reply-To":"<20260427221155.2144848-1-dakr@kernel.org>","References":"<20260427221155.2144848-1-dakr@kernel.org>","Precedence":"bulk","X-Mailing-List":"linux-pwm@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit"},"content":"Make the Data struct lifetime-parameterized, storing a reference to the\nparent pci::Device. This demonstrates that registration data can\nhold device resources tied to the parent driver's lifetime.\n\nIn connect(), retrieve the parent PCI device from the registration data\nrather than casting through adev.parent().\n\nSigned-off-by: Danilo Krummrich \n---\n samples/rust/rust_driver_auxiliary.rs | 27 ++++++++++++++++-----------\n 1 file changed, 16 insertions(+), 11 deletions(-)","diff":"diff --git a/samples/rust/rust_driver_auxiliary.rs b/samples/rust/rust_driver_auxiliary.rs\nindex 4ad619c5731e..010ec2201a69 100644\n--- a/samples/rust/rust_driver_auxiliary.rs\n+++ b/samples/rust/rust_driver_auxiliary.rs\n@@ -51,14 +51,15 @@ fn probe(\n }\n }\n \n-struct Data {\n+struct Data<'a> {\n index: u32,\n+ parent: &'a pci::Device,\n }\n \n #[allow(clippy::type_complexity)]\n struct ParentDriver {\n- _reg0: Devres>,\n- _reg1: Devres>,\n+ _reg0: Devres)>>,\n+ _reg1: Devres)>>,\n }\n \n kernel::pci_device_table!(\n@@ -83,14 +84,20 @@ fn probe(\n AUXILIARY_NAME,\n 0,\n MODULE_NAME,\n- Data { index: 0 },\n+ Data {\n+ index: 0,\n+ parent: pdev,\n+ },\n )?,\n _reg1: auxiliary::Registration::new(\n pdev.as_ref(),\n AUXILIARY_NAME,\n 1,\n MODULE_NAME,\n- Data { index: 1 },\n+ Data {\n+ index: 1,\n+ parent: pdev,\n+ },\n )?,\n })\n }\n@@ -98,13 +105,11 @@ fn probe(\n \n impl ParentDriver {\n fn connect(adev: &auxiliary::Device) -> Result {\n- let dev = adev.parent();\n- let pdev: &pci::Device = dev.try_into()?;\n-\n- let data = adev.registration_data::()?;\n+ let data = adev.registration_data::)>()?;\n+ let pdev = data.parent;\n \n dev_info!(\n- dev,\n+ pdev,\n \"Connect auxiliary {} with parent: VendorID={}, DeviceID={:#x}\\n\",\n adev.id(),\n pdev.vendor_id(),\n@@ -112,7 +117,7 @@ fn connect(adev: &auxiliary::Device) -> Result {\n );\n \n dev_info!(\n- dev,\n+ pdev,\n \"Connected to auxiliary device with index {}.\\n\",\n data.index\n );\n","prefixes":["15/24"]}