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Tue, 10 Jan 2023 06:49:47 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v2] cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering Date: Tue, 10 Jan 2023 20:49:40 +0800 Message-ID: <20230110124940.1622798-1-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT085:EE_|SJ0PR12MB5488:EE_ X-MS-Office365-Filtering-Correlation-Id: 5d748a65-c4b6-494e-361c-08daf3092ab1 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)(39860400002)(376002)(346002)(136003)(396003)(451199015)(36840700001)(40470700004)(46966006)(36860700001)(82740400003)(6666004)(2906002)(81166007)(356005)(2616005)(1076003)(26005)(44832011)(7696005)(186003)(16526019)(40480700001)(478600001)(316002)(5660300002)(82310400005)(8936002)(83380400001)(36756003)(86362001)(426003)(47076005)(40460700003)(41300700001)(70586007)(8676002)(70206006)(4326008)(54906003)(336012)(110136005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2023 12:49:52.1452 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5d748a65-c4b6-494e-361c-08daf3092ab1 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: CO1NAM11FT085.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB5488 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?1754640161896595455?= X-GMAIL-MSGID: =?utf-8?q?1754640161896595455?= 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 Tested-by: Wyes Karny 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)