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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 SJ1PEPF000023CE.mail.protection.outlook.com (10.167.244.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.451.8 via Frontend Transport; Mon, 21 Sep 2026 17:55:52 +0000 Received: from satlexmb08.amd.com (10.181.42.217) 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 15.2.2562.49; Mon, 21 Sep 2026 12:55:51 -0500 Received: from galena-46a8.xcblab.xilinx.com (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49 via Frontend Transport; Mon, 21 Sep 2026 12:55:51 -0500 From: To: , CC: , , , , , , , Alejandro Lucero Subject: [PATCH v1 1/4] driver core: Rely on supplier driver binding at link creation Date: Mon, 21 Sep 2026 20:12:36 +0100 Message-ID: <20260921191239.4249-2-alucerop@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260921191239.4249-1-alucerop@amd.com> References: <20260921191239.4249-1-alucerop@amd.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023CE:EE_|SN7PR12MB8602:EE_ X-MS-Office365-Filtering-Correlation-Id: b9eb7ade-d6d7-4545-6a47-08df180993f5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|23010399003|36860700016|82310400026|1800799024|10067099003|22082099003|18002099003|11063799006|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: fu7M+t5ewsoSGIwed3B0JiAEL6fPjRqVEfqPaZPtlpmLKsdmCd9fJ85jg9++Bf6oY7b+25zRRhjxI1KSXFcqnGcvIuB7lMGf4tQNE4eYF/aMXilPEIxQ3Jdz8I3bxHqRNnJz3IQo0GAPTpDR0T4Fflsw90yOz+LgvXUjwLrmi1hyyJlNFCZnDH6FMmeqK70GCsSYmodu9QMM/ijzOiOjxFauPkDB+v1I0Ni8fM6gucJGcL7lf597SxyWxLklIVKQEbWvJQdRPBaion807fQ735xojCI0SFSMhW0uHrckfFMvmE+WNO7dxS+EEqrCBHQXyQkc+zHyefBblSbd8DSqFUlyrxj9lqDfyioXYKFKDFLNhd0kY4YlU+xu1d8AEbaeN3rSsMxW1rXKEzO5WM+RmG9KSSFJAOP/swHHJuvUgar7y4XTq2rgQMi/eWSUcNBq X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Sep 2026 17:55:52.5354 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b9eb7ade-d6d7-4545-6a47-08df180993f5 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023CE.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB8602 From: Alejandro Lucero Differentiate between driver binding from PM dependency when a device link is created. Rely on the device being bound to a driver for validating the supplier as some device drivers could not support PM. Check for supplier's PM state only if consumer specifies PM_RUNTIME flag. Signed-off-by: Alejandro Lucero --- drivers/base/core.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 4c0c373998a1..eb6d87e35d76 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -834,15 +834,26 @@ struct device_link *device_link_add(struct device *consumer, device_pm_lock(); /* - * If the supplier has not been fully registered yet or there is a - * reverse (non-SYNC_STATE_ONLY) dependency between the consumer and - * the supplier already in the graph, return NULL. If the link is a - * SYNC_STATE_ONLY link, we don't check for reverse dependencies - * because it only affects sync_state() callbacks. + * If the supplier has not been fully registered yet with a driver + * return NULL. */ - if (!device_pm_initialized(supplier) - || (!(flags & DL_FLAG_SYNC_STATE_ONLY) && - device_is_dependent(consumer, supplier))) { + scoped_guard(device, supplier) { + if (!device_is_bound(supplier)) { + link = NULL; + goto out; + } + } + /* + * If consumer asks for PM to use the link and the supplier has not + * PM initialized, or if there is a reverse (non-SYNC_STATE_ONLY) + * dependency between the consumer and the supplier already in the + * graph, return NULL. If the link is a SYNC_STATE_ONLY link, we + * don't check for reverse dependencies because it only affects + * sync_state() callbacks. + */ + if (((flags & DL_FLAG_PM_RUNTIME) && !device_pm_initialized(supplier)) || + (!(flags & DL_FLAG_SYNC_STATE_ONLY) && + device_is_dependent(consumer, supplier))) { link = NULL; goto out; } -- 2.34.1