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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ5PEPF000001D3.mail.protection.outlook.com (10.167.242.55) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7409.10 via Frontend Transport; Tue, 19 Mar 2024 08:29:21 +0000 Received: from pyuan-Chachani-VN.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 19 Mar 2024 03:29:17 -0500 From: Perry Yuan To: , , , , , CC: , , , , , , Subject: [PATCH v9 5/8] cpufreq: amd-pstate: Bail out if min/max/nominal_freq is 0 Date: Tue, 19 Mar 2024 16:28:40 +0800 Message-ID: <884cab991815707eb10b720e6f72978cbb5e54f6.1710836407.git.perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: SJ5PEPF000001D3:EE_|IA1PR12MB7710:EE_ X-MS-Office365-Filtering-Correlation-Id: 5158945a-b3d5-4df9-7992-08dc47eead58 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Mar 2024 08:29:21.4562 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5158945a-b3d5-4df9-7992-08dc47eead58 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: SJ5PEPF000001D3.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7710 The amd-pstate driver cannot work when the min_freq, nominal_freq or the max_freq is zero. When this happens it is prudent to error out early on rather than waiting failing at the time of the governor initialization. Signed-off-by: Perry Yuan Reviewed-by: Gautham R. Shenoy --- drivers/cpufreq/amd-pstate.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 132330b4942f..6708c436e1a2 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -839,9 +839,11 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy) nominal_freq = READ_ONCE(cpudata->nominal_freq); lowest_nonlinear_freq = READ_ONCE(cpudata->lowest_nonlinear_freq); - if (min_freq < 0 || max_freq < 0 || min_freq > max_freq) { - dev_err(dev, "min_freq(%d) or max_freq(%d) value is incorrect\n", - min_freq, max_freq); + if (min_freq <= 0 || max_freq <= 0 || + nominal_freq <= 0 || min_freq > max_freq) { + dev_err(dev, + "min_freq(%d) or max_freq(%d) or nominal_freq (%d) value is incorrect\n", + min_freq, max_freq, nominal_freq); ret = -EINVAL; goto free_cpudata1; } @@ -1299,9 +1301,11 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) max_freq = READ_ONCE(cpudata->max_freq); nominal_freq = READ_ONCE(cpudata->nominal_freq); lowest_nonlinear_freq = READ_ONCE(cpudata->lowest_nonlinear_freq); - if (min_freq < 0 || max_freq < 0 || min_freq > max_freq) { - dev_err(dev, "min_freq(%d) or max_freq(%d) value is incorrect\n", - min_freq, max_freq); + if (min_freq <= 0 || max_freq <= 0 || + nominal_freq <= 0 || min_freq > max_freq) { + dev_err(dev, + "min_freq(%d) or max_freq(%d) or nominal_freq(%d) value is incorrect\n", + min_freq, max_freq, nominal_freq); ret = -EINVAL; goto free_cpudata1; }