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Thu, 16 Oct 2025 06:51:40 +0000 Message-ID: <5f7a4e3f-0f60-46bb-8448-6750803fdd8e@intel.com> Date: Thu, 16 Oct 2025 09:51:35 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND] mmc: core: Fix system shutdown hang in mmc_bus_shutdown To: Michael Wu , , , , , , , CC: , , , References: <20251015060714.67558-1-michael@allwinnertech.com> <9f666390-653d-4834-800d-8997665b6dac@intel.com> <6ac35d5e-7d2f-9af6-d1c4-831725c33896@allwinnertech.com> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: <6ac35d5e-7d2f-9af6-d1c4-831725c33896@allwinnertech.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DU7P194CA0015.EURP194.PROD.OUTLOOK.COM (2603:10a6:10:553::10) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB7198:EE_|SA0PR11MB4608:EE_ X-MS-Office365-Filtering-Correlation-Id: 75cb458e-4a13-40d5-367c-08de0c8075d5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; 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Devices should not really be removed during shutdown. The requirement for shutdown is to ensure there are no on-going operations and to prepare the hardware for power-off. So this sounds like the WiFi driver should not be executing an unload procedure at shutdown. > This is something we cannot control and cannot handle using `reboot_notifier_list` and `register_reboot_notifier()` operations. Moreover, different WiFi drivers may have different handling sequences for this timing. > > From this perspective, we believe it's not convenient to address the issue in that way. > > We noticed that the `mmc_bus_shutdown` function calling `cancel_delayed_work_sync` was newly added. Therefore, we suggest removing this part first. > > On 10/15/2025 3:09 PM, Adrian Hunter wrote: >> reboot_notifier_list and >> register_reboot_notifier() >