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charset=UTF-8 Date: Tue, 19 May 2026 13:52:32 +0900 Message-Id: Cc: , , , , , , , Subject: Re: [PATCH v3 10/27] rust: pci: make Driver trait lifetime-parameterized From: "Eliot Courtney" To: "Danilo Krummrich" , , , , , , , , , , , , , , , , , , , , , , , , , X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20260517000149.3226762-1-dakr@kernel.org> <20260517000149.3226762-11-dakr@kernel.org> In-Reply-To: <20260517000149.3226762-11-dakr@kernel.org> X-ClientProxiedBy: TYCP286CA0095.JPNP286.PROD.OUTLOOK.COM (2603:1096:400:2b4::18) To BL0PR12MB2353.namprd12.prod.outlook.com (2603:10b6:207:4c::31) Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL0PR12MB2353:EE_|CH3PR12MB9344:EE_ X-MS-Office365-Filtering-Correlation-Id: ac6b8dac-9f77-427a-7056-08deb5627272 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|366016|10070799003|11063799003|4143699003|56012099003|22082099003|18002099003|921020; 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device resources can be stored directly by > reference rather than requiring Devres. > > The probe() and unbind() callbacks thus gain a 'bound lifetime parameter > on the methods themselves; avoiding a global lifetime on the trait impl. > > Existing drivers set type Data<'bound> =3D Self, preserving the current > behavior. > > Signed-off-by: Danilo Krummrich > --- Is this really sound without a covariance proof? For example, with this version you could stash a Cell> (even with Gary's suggested Core<'_> change) and then observe that reference on Drop of Data, which seems unsound to me.