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Wysocki" , Rob Herring , Thierry Reding , Thierry Reding Subject: [PATCH v2 4/7] iommu: Mark dev_iommu_get() with lockdep Date: Thu, 7 Dec 2023 14:03:11 -0400 Message-ID: <4-v2-16e4def25ebb+820-iommu_fwspec_p1_jgg@nvidia.com> In-Reply-To: <0-v2-16e4def25ebb+820-iommu_fwspec_p1_jgg@nvidia.com> References: X-ClientProxiedBy: BLAPR03CA0038.namprd03.prod.outlook.com (2603:10b6:208:32d::13) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|CH3PR12MB7667:EE_ X-MS-Office365-Filtering-Correlation-Id: be10007d-4d75-49f9-acbf-08dbf74ec8b2 X-LD-Processed: 43083d15-7273-40c1-b7db-39efd9ccc17a,ExtAddr 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV2PR12MB5869.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(39860400002)(366004)(376002)(346002)(136003)(396003)(230922051799003)(186009)(1800799012)(451199024)(64100799003)(7366002)(4744005)(7416002)(2906002)(7406005)(5660300002)(41300700001)(86362001)(8676002)(4326008)(8936002)(36756003)(316002)(66946007)(66556008)(66476007)(54906003)(110136005)(921008)(38100700002)(6486002)(478600001)(107886003)(83380400001)(6666004)(6506007)(26005)(6512007)(2616005)(4216001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: be10007d-4d75-49f9-acbf-08dbf74ec8b2 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2023 18:03:15.2068 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: lieThUuRh1+FpPXFTEYv1mJDv/P5EhQSZ7+KvAdBY/o4zzTiaZQDkRcEBvV9kvWn X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7667 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231207_100326_915432_AE4FDB80 X-CRM114-Status: GOOD ( 10.24 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Allocation of dev->iommu must be done under the iommu_probe_device_lock. Mark this with lockdep to discourage future mistakes. Reviewed-by: Jerry Snitselaar Tested-by: Hector Martin Reviewed-by: Lu Baolu Reviewed-by: Moritz Fischer Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommu.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 0d25468d53a68a..4323b6276e977f 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -334,6 +334,8 @@ static struct dev_iommu *dev_iommu_get(struct device *dev) { struct dev_iommu *param = dev->iommu; + lockdep_assert_held(&iommu_probe_device_lock); + if (param) return param;