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Y. Srinivasan" , Laxman Dewangan , Len Brown , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-snps-arc@lists.infradead.org, linux-tegra@vger.kernel.org, Russell King , Lorenzo Pieralisi , Lyude Paul , Marek Szyprowski , nouveau@lists.freedesktop.org, Palmer Dabbelt , Paul Walmsley , "Rafael J. Wysocki" , Rob Herring , Robin Murphy , Sudeep Holla , Suravee Suthikulpanit , Sven Peter , Thomas Bogendoerfer , Vineet Gupta , Vinod Koul , Wei Liu , Will Deacon Cc: Lu Baolu , Christoph Hellwig , Jerry Snitselaar , Hector Martin , Moritz Fischer , patches@lists.linux.dev, "Rafael J. Wysocki" , Rob Herring , Thierry Reding Subject: [PATCH 03/10] iommu/of: Use -ENODEV consistently in of_iommu_configure() Date: Tue, 28 Nov 2023 20:47:59 -0400 Message-ID: <3-v1-720585788a7d+811b-iommu_fwspec_p1_jgg@nvidia.com> In-Reply-To: <0-v1-720585788a7d+811b-iommu_fwspec_p1_jgg@nvidia.com> References: X-ClientProxiedBy: SN6PR05CA0001.namprd05.prod.outlook.com (2603:10b6:805:de::14) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|MW5PR12MB5649:EE_ X-MS-Office365-Filtering-Correlation-Id: 90b77a9e-c96e-4697-a320-08dbf074dbac 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)(136003)(39860400002)(396003)(366004)(376002)(346002)(230922051799003)(186009)(1800799012)(64100799003)(451199024)(5660300002)(7416002)(7366002)(7406005)(41300700001)(4326008)(8936002)(8676002)(2906002)(110136005)(316002)(66556008)(66476007)(54906003)(66946007)(2616005)(921008)(6486002)(478600001)(36756003)(6512007)(6506007)(26005)(6666004)(83380400001)(86362001)(38100700002)(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: 90b77a9e-c96e-4697-a320-08dbf074dbac X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Nov 2023 00:48:09.6808 (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: qnid2sxxBR52CEopIx4pyN38qx5HD22qIJhJWeAfEBE+iI/VzfaFjjKe3u3ej7nK X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR12MB5649 Instead of returning 1 and trying to handle positive error codes just stick to the convention of returning -ENODEV. Remove references to ops from of_iommu_configure(), a NULL ops will already generate an error code. There is no reason to check dev->bus, if err=0 at this point then the called configure functions thought there was an iommu and we should try to probe it. Remove it. Reviewed-by: Jerry Snitselaar Tested-by: Hector Martin Signed-off-by: Jason Gunthorpe --- drivers/iommu/of_iommu.c | 49 ++++++++++++---------------------------- 1 file changed, 15 insertions(+), 34 deletions(-) diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index c6510d7e7b241b..164317bfb8a81f 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -17,8 +17,6 @@ #include #include -#define NO_IOMMU 1 - static int of_iommu_xlate(struct device *dev, struct of_phandle_args *iommu_spec) { @@ -29,7 +27,7 @@ static int of_iommu_xlate(struct device *dev, ops = iommu_ops_from_fwnode(fwnode); if ((ops && !ops->of_xlate) || !of_device_is_available(iommu_spec->np)) - return NO_IOMMU; + return -ENODEV; ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops); if (ret) @@ -61,7 +59,7 @@ static int of_iommu_configure_dev_id(struct device_node *master_np, "iommu-map-mask", &iommu_spec.np, iommu_spec.args); if (err) - return err == -ENODEV ? NO_IOMMU : err; + return err; err = of_iommu_xlate(dev, &iommu_spec); of_node_put(iommu_spec.np); @@ -72,7 +70,7 @@ static int of_iommu_configure_dev(struct device_node *master_np, struct device *dev) { struct of_phandle_args iommu_spec; - int err = NO_IOMMU, idx = 0; + int err = -ENODEV, idx = 0; while (!of_parse_phandle_with_args(master_np, "iommus", "#iommu-cells", @@ -117,9 +115,8 @@ static int of_iommu_configure_device(struct device_node *master_np, int of_iommu_configure(struct device *dev, struct device_node *master_np, const u32 *id) { - const struct iommu_ops *ops = NULL; struct iommu_fwspec *fwspec; - int err = NO_IOMMU; + int err; if (!master_np) return -ENODEV; @@ -153,37 +150,21 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np, } else { err = of_iommu_configure_device(master_np, dev, id); } - - /* - * Two success conditions can be represented by non-negative err here: - * >0 : there is no IOMMU, or one was unavailable for non-fatal reasons - * 0 : we found an IOMMU, and dev->fwspec is initialised appropriately - * <0 : any actual error - */ - if (!err) { - /* The fwspec pointer changed, read it again */ - fwspec = dev_iommu_fwspec_get(dev); - ops = fwspec->ops; - } mutex_unlock(&iommu_probe_device_lock); - /* - * If we have reason to believe the IOMMU driver missed the initial - * probe for dev, replay it to get things in order. - */ - if (!err && dev->bus) - err = iommu_probe_device(dev); - - /* Ignore all other errors apart from EPROBE_DEFER */ - if (err < 0) { - if (err == -EPROBE_DEFER) - return err; - dev_dbg(dev, "Adding to IOMMU failed: %pe\n", ERR_PTR(err)); + if (err == -ENODEV || err == -EPROBE_DEFER) return err; - } - if (!ops) - return -ENODEV; + if (err) + goto err_log; + + err = iommu_probe_device(dev); + if (err) + goto err_log; return 0; + +err_log: + dev_dbg(dev, "Adding to IOMMU failed: %pe\n", ERR_PTR(err)); + return err; } static enum iommu_resv_type __maybe_unused