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Howlett" , linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, maple-tree@lists.infradead.org, asahi@lists.linux.dev, linux-mm@kvack.org Subject: Re: [PATCH v3 1/2] regmap: Remove debugfs before cache teardown Message-ID: References: <20261006-regcache-lifecycle-submit-v3-0-37bdd82fd47c@gmail.com> <20261006-regcache-lifecycle-submit-v3-1-37bdd82fd47c@gmail.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261006-regcache-lifecycle-submit-v3-1-37bdd82fd47c@gmail.com> X-ClientProxiedBy: SG2P153CA0026.APCP153.PROD.OUTLOOK.COM (2603:1096:4:c7::13) To AM8PR04MB7874.eurprd04.prod.outlook.com (2603:10a6:20b:24d::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM8PR04MB7874:EE_|PA4PR04MB9365:EE_ X-MS-Office365-Filtering-Correlation-Id: c86168a0-7aa3-4c2e-138d-08df2528cd5b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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BBSsJpxqIVgc1krXjubzlm/p3YV/dPgIf9WKwbgHMluo+zqaywbXo9rCuJbezUhrhy4/nfhjjGtDmO9V7YjJV9hphVqAbsODcUhzpcH/foxAy8NKr2JjTjC0INigdCDye4LrAMn8oNvIT39xZxSNd100Hgs8wkCAaqBR6UZR8t+PR3MGT+z57a3l8zBJqovITqMrKOfg0rbkA4ruk+Z5gNNN1m0TYpYKeOP/XJ4KjSP38AyWDbTVmn/8/PJfJ9YlRTxkUm4s2DmIpDMcBmOrtxgDRoHXbvfB8TEdo8S4S0ipj4liMewjoY5L/6Q/kp2DeZqGSSXOE4lUyvDi6FYJTQgNc4X28gLD5+aAv00bDlvQ9ByjFRi1Agww7BoVzEDqhV7CN/zx8uZBJaEtlaFBFGjiRTuWdIUtxnMnaFjNz0VDsdyap8KYlkwAiUqcPqHnnIOLUcvhTOOMB2k4GVZdI2tM1TpJvmPd+lO6PXjjFa7AJgIBDJfSDRqThu8rVEq/JyK+oDNdvo2SWfGFzMlceviccY7B69WDFfl+yl6oU0mJwfvpdrTQKwzOgsqc0vQCvRngKmf4TAUoIf0Fr3wZYgXFsbioH629nJ9T0r9ub4Oe4h60+lIOHjN82XVwjLoIoS7ybCkpTM/g45Wh/diETEEfOBFInFzrvzwoQ4wRzVj1Hu8w= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Oct 06, 2026 at 06:03:15PM +1100, Michael Reeves wrote: >regmap_exit() and regmap_reinit_cache() destroy the register cache before >removing debugfs. A concurrent debugfs cache operation can therefore >access cache state after the backend exit callback starts freeing it. > >Remove debugfs before cache teardown, and clear the debugfs pointer after >removal. During cache reinitialization, recreate debugfs only after the >new cache initializes successfully. > >Signed-off-by: Michael Reeves Reviewed-by: Peng Fan