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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by BL6PEPF0001AB71.mail.protection.outlook.com (10.167.242.164) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.181.6 via Frontend Transport; Fri, 10 Jul 2026 14:47:08 +0000 Received: from dcsm-trdripper1.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Fri, 10 Jul 2026 09:46:57 -0500 From: Muralidhara M K To: CC: , , , Muralidhara M K Subject: [PATCH v5 4/6] platform/x86/amd/hsmp: Clear mdev.this_device on deregister Date: Fri, 10 Jul 2026 20:16:31 +0530 Message-ID: <20260710144633.879018-5-muralidhara.mk@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260710144633.879018-1-muralidhara.mk@amd.com> References: <20260710144633.879018-1-muralidhara.mk@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB71:EE_|SJ2PR12MB8182:EE_ X-MS-Office365-Filtering-Correlation-Id: 44f96e21-f912-45ff-675e-08dede921dd9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|23010399003|82310400026|1800799024|56012099006|11063799006|18002099003|22082099003; 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Clear it so any later check of this_device, and a subsequent re-register, does not observe a stale pointer. An upcoming change uses this_device to track whether /dev/hsmp is registered across the shared ACPI sockets and relies on it being NULL after deregister. Signed-off-by: Muralidhara M K --- drivers/platform/x86/amd/hsmp/hsmp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/platform/x86/amd/hsmp/hsmp.c b/drivers/platform/x86/amd/hsmp/hsmp.c index fd36c8f142c0..584fd9b1d31f 100644 --- a/drivers/platform/x86/amd/hsmp/hsmp.c +++ b/drivers/platform/x86/amd/hsmp/hsmp.c @@ -539,6 +539,7 @@ EXPORT_SYMBOL_NS_GPL(hsmp_misc_register, "AMD_HSMP"); void hsmp_misc_deregister(void) { misc_deregister(&hsmp_pdev.mdev); + hsmp_pdev.mdev.this_device = NULL; } EXPORT_SYMBOL_NS_GPL(hsmp_misc_deregister, "AMD_HSMP"); -- 2.34.1