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Mon, 17 Oct 2022 16:00:47 -0700 From: Nicolin Chen To: , , CC: , , , , Subject: [PATCH v7 1/5] iommu/amd: Drop unnecessary checks in amd_iommu_attach_device() Date: Mon, 17 Oct 2022 16:00:45 -0700 Message-ID: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT013:EE_|BL1PR12MB5320:EE_ X-MS-Office365-Filtering-Correlation-Id: be357109-64db-4c7c-37ce-08dab09375f7 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:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230022)(4636009)(376002)(39860400002)(346002)(136003)(396003)(451199015)(46966006)(36840700001)(40470700004)(83380400001)(2906002)(2616005)(336012)(186003)(426003)(40460700003)(8676002)(7696005)(26005)(4326008)(82740400003)(47076005)(40480700001)(86362001)(82310400005)(356005)(7636003)(36756003)(316002)(54906003)(41300700001)(5660300002)(8936002)(36860700001)(70206006)(110136005)(70586007)(478600001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2022 23:01:01.1226 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: be357109-64db-4c7c-37ce-08dab09375f7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT013.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5320 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The same checks are done in amd_iommu_probe_device(). If any of them fails there, then the device won't get a group, so there's no way for it to even reach amd_iommu_attach_device anymore. Suggested-by: Robin Murphy Cc: Joerg Roedel Cc: Suravee Suthikulpanit Reviewed-by: Vasant Hegde Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/amd/iommu.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 65856e401949..fbb2d1be76a0 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2155,21 +2155,13 @@ static void amd_iommu_detach_device(struct iommu_do= main *dom, static int amd_iommu_attach_device(struct iommu_domain *dom, struct device *dev) { + struct iommu_dev_data *dev_data =3D dev_iommu_priv_get(dev); struct protection_domain *domain =3D to_pdomain(dom); - struct iommu_dev_data *dev_data; - struct amd_iommu *iommu; + struct amd_iommu *iommu =3D rlookup_amd_iommu(dev); int ret; =20 - if (!check_device(dev)) - return -EINVAL; - - dev_data =3D dev_iommu_priv_get(dev); dev_data->defer_attach =3D false; =20 - iommu =3D rlookup_amd_iommu(dev); - if (!iommu) - return -EINVAL; - if (dev_data->domain) detach_device(dev); =20 --=20 2.17.1