From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from CY7PR03CU001.outbound.protection.outlook.com (mail-westcentralusazon11010048.outbound.protection.outlook.com [40.93.198.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9DA09262FC1; Thu, 6 Aug 2026 16:03:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.198.48 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786032193; cv=fail; b=ea/Kg7m9/ypvqpCnTNHP7sCAIib7LGc/8cQt++mnGwpG251Q7/l0wdWUEx2BxYLf8BN7ydU0TLxybMtvWdCvUceN085LqLsgX8qKTGLjSmQdNZGLZhpG3tNv2+8/mrlS4lGmPskW+IPmUH3iwAdGcwUcd3JiaEJUP8qeIqBxya4= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786032193; c=relaxed/simple; bh=gQEbXGv7F+1DNfyis9Sy0cGsQPLrqk/UBJc850PHwKg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=OcNp8olKLen/UYIhk3KPUTaN8P6UIkqcHj4xP9HVi/YlT5VmZoAXJNhJS1Gpbc/ahtzOfL5XJyIUVRJwVbH3dwRNidT4jSmwsbbV7gheuX0F3+miGi1GqCjzy+lH5cDxn0wuO7RzX3zAcomoJ1PxOLgGW65O10q90GeNjMrDEHI= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=rajF8R8n; arc=fail smtp.client-ip=40.93.198.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="rajF8R8n" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=mAQ2p/9AZuix1SLkLC4WFxxzIU5GbTPqGHXLz/qPfWlvlIqeNksmGoDiGtvQqg8SNOJzgko4QTyjpEDGcAm+IgyASeQ7agoi9FHgwsYl7EQ65KoeOK7YWA/izLjTYAlRs6oB+vihJEUx3dJ3irUVx2J2CipLbTwzGUdgiZV2Au+M9nVuR3W5jWslxJzwD2qWgYIvYu3jl8SbbFxOTpFypP+deKhI4XgdO80vftekL2+MPT3ldWCne/QQKLWmG3+1Bm/adVdvL8vpdBhTgDoy/dAxLd/DqPE6jPH8K2RcUTXpVqaVBU2PeVIooZpHTtAsDw1w8JCoSDnj+wxAa/5mag== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=lmfBYP95tokplULiarg6QmMLra3zMloJlSltyrhjlEk=; b=KKwGcDfYxNNTV32ywzMju6h5JXnS7+4yLGPXqVVC6VYVl7Amj8iC8sYJRm+H72qFd3YuVKVHsOX3G4onlBcyZaxuvoLSCyc0XcwpQ/+WD4xtJ7Vs95mTwXRMsYrXv6bTfda+k8qtYbJlQFZWjjE9TtkNKEfbeX4c8Dhu+GU4ES6gBfC3v7osbrqTBdmpyfS1nF/QWOmui7HXN2arR/HDVEmJ2v9sxVfSt85APQ2E23OxG2I/S/cJhlKR2YFTwdMb6UPCSmjOIhelbUlHnkzArstp8thpGH91+gIA73BTE7jtBlX8hdHugBxINPJqMtS29W6ecg/SgVIjhw5qgW9RqQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=alien8.de smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=lmfBYP95tokplULiarg6QmMLra3zMloJlSltyrhjlEk=; b=rajF8R8nKZJvYWOvQRDtna1VtFDVrZLKAMxvxyiaxNKtlJu2OlWIBcV10gmkBc1feUFqBidJLj5l14yuuTv0I9onqtz6Gza+uYikUiSHGcbzu9WwZzsc8oPnuhkUBOyKgA9Tr5Y3yr85NL2wVHNuwpmtbUEmNGhChBPsTo2t9Z0= Received: from BL1P221CA0035.NAMP221.PROD.OUTLOOK.COM (2603:10b6:208:5b5::8) by PH8PR12MB7110.namprd12.prod.outlook.com (2603:10b6:510:22e::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.292.20; Thu, 6 Aug 2026 16:03:04 +0000 Received: from BL02EPF0002992C.namprd02.prod.outlook.com (2603:10b6:208:5b5:cafe::6d) by BL1P221CA0035.outlook.office365.com (2603:10b6:208:5b5::8) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.21.292.21 via Frontend Transport; Thu, 6 Aug 2026 16:03:02 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by BL02EPF0002992C.mail.protection.outlook.com (10.167.249.57) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.6 via Frontend Transport; Thu, 6 Aug 2026 16:03:01 +0000 Received: from satlexmb10.amd.com (10.181.42.219) 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; Thu, 6 Aug 2026 11:02:49 -0500 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb10.amd.com (10.181.42.219) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Thu, 6 Aug 2026 11:02:06 -0500 Received: from fedora.mshome.net (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Thu, 6 Aug 2026 11:02:05 -0500 From: Jason Andryuk To: Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Ingo Molnar , "Mario Limonciello" , Thomas Gleixner , , Yazen Ghannam CC: Jason Andryuk , , Penny Zheng , Subject: [PATCH 1/2] x86/amd_node: Remove smn_exclusive Date: Thu, 6 Aug 2026 12:01:56 -0400 Message-ID: <20260806160159.230453-2-jason.andryuk@amd.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260806160159.230453-1-jason.andryuk@amd.com> References: <20260806160159.230453-1-jason.andryuk@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-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0002992C:EE_|PH8PR12MB7110:EE_ X-MS-Office365-Filtering-Correlation-Id: c68f2daa-891e-4f19-753a-08def3d43150 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|23010399003|82310400026|376014|11063799006|56012099006|10067099003|6133799003|22082099003|18002099003; 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:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(36860700016)(23010399003)(82310400026)(376014)(11063799006)(56012099006)(10067099003)(6133799003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ddIISs/sEv7OkHAzDzBxTa0TjmAi48xFFxcmlS0OmXuccrrttYGUB+xQcMYSSWRhTu8e0AxwDTa0i1LO5QuLZ9gcWaHS1Yfq9zJX7FA66SjqLJ9tKWKaM6NcCI1n79JLAYYNSufuraB/bu/icEpn/Rf5G+NPHFRHLTVsZvaEHZzn+DjR0OTPXnyDaic9p2NdQUm7tUDPheTSdRjUizRfe3lF6hALrL+XRsyF/89tylN5FTwDmUgPqhxLr0kWjoDBUbR4e4YAUPBbnUsJWVwJ8ILMgnKh4tfdgweOra0r1Ke4h6Vv4E30y8xUcw5NaSvsYrlBag+7ldRHo0O/DAliRxblGShFZkenk/WTIRgyXSRHffr0uy6av33Mq0vqEjzeZO3tjkonyeFi9ld0YzTVb3UgATGuodD0rCABJK7kPHzbVy2fHavWPNmxeAOyZQe1 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2026 16:03:01.8705 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c68f2daa-891e-4f19-753a-08def3d43150 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: BL02EPF0002992C.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7110 amd_smn_read/write() are exported functions around __amd_smn_rw(), so they are always available even if amd_smn_init() fails. smn_exclusive would prevent access __amd_smn_rw(), but it is placed too late. If amd_smn_init() failed, amd_roots is NULL and __amd_smn_rw() will fault over it. Replace smn_exclusive with directly checking amd_roots to avoid the NULL pointer dereference. Fixes: 77466b798d59 ("x86/amd_node: Remove dependency on AMD_NB") Cc: stable@vger.kernel.org Signed-off-by: Jason Andryuk --- Fixes is the introduction of amd_roots --- arch/x86/kernel/amd_node.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/amd_node.c b/arch/x86/kernel/amd_node.c index 0be01725a2a4..ea553267e5fa 100644 --- a/arch/x86/kernel/amd_node.c +++ b/arch/x86/kernel/amd_node.c @@ -38,7 +38,6 @@ static struct pci_dev **amd_roots; /* Protect the PCI config register pairs used for SMN. */ static DEFINE_MUTEX(smn_mutex); -static bool smn_exclusive; #define SMN_INDEX_OFFSET 0x60 #define SMN_DATA_OFFSET 0x64 @@ -91,11 +90,11 @@ static int __amd_smn_rw(u8 i_off, u8 d_off, u16 node, u32 address, u32 *value, b if (node >= amd_num_nodes()) return err; - root = amd_roots[node]; - if (!root) + if (!amd_roots) return err; - if (!smn_exclusive) + root = amd_roots[node]; + if (!root) return err; guard(mutex)(&smn_mutex); @@ -308,8 +307,6 @@ static int __init amd_smn_init(void) debugfs_create_file("value", 0600, debugfs_dir, NULL, &smn_value_fops); } - smn_exclusive = true; - return 0; } -- 2.55.0