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Sun, 25 Dec 2022 10:35:10 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v9 04/13] cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering Date: Mon, 26 Dec 2022 00:34:33 +0800 Message-ID: <20221225163442.2205660-5-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221225163442.2205660-1-perry.yuan@amd.com> References: <20221225163442.2205660-1-perry.yuan@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT082:EE_|BY5PR12MB4949:EE_ X-MS-Office365-Filtering-Correlation-Id: 2775602f-91f1-464f-e95d-08dae69600cd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(376002)(136003)(346002)(39850400004)(396003)(451199015)(36840700001)(40470700004)(46966006)(70206006)(4326008)(70586007)(8676002)(478600001)(6666004)(36860700001)(36756003)(7696005)(40460700003)(54906003)(110136005)(316002)(186003)(26005)(16526019)(82740400003)(1076003)(2616005)(2906002)(44832011)(82310400005)(40480700001)(336012)(81166007)(356005)(86362001)(41300700001)(47076005)(426003)(8936002)(83380400001)(5660300002)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Dec 2022 16:35:15.7605 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2775602f-91f1-464f-e95d-08dae69600cd X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT082.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4949 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1753204579775595959?= X-GMAIL-MSGID: =?utf-8?q?1753204579775595959?= In the amd_pstate_adjust_perf(), there is one cpufreq_cpu_get() call to increase increments the kobject reference count of policy and make it as busy. Therefore, a corresponding call to cpufreq_cpu_put() is needed to decrement the kobject reference count back, it will resolve the kernel hang issue when unregistering the amd-pstate driver and register the `amd_pstate_epp` driver instance. Acked-by: Huang Rui Reviewed-by: Mario Limonciello Signed-off-by: Perry Yuan Cc: stable@vger.kernel.org --- drivers/cpufreq/amd-pstate.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 204e39006dda..c17bd845f5fc 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -307,6 +307,7 @@ static void amd_pstate_adjust_perf(unsigned int cpu, max_perf = min_perf; amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true); + cpufreq_cpu_put(policy); } static int amd_get_min_freq(struct amd_cpudata *cpudata)