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GET /api/patches/2224152/?format=api
{ "id": 2224152, "url": "http://patchwork.ozlabs.org/api/patches/2224152/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/3f5d229267d1f4d918641bc5b896f54b5c4b7782.1776381841.git.nicolinc@nvidia.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<3f5d229267d1f4d918641bc5b896f54b5c4b7782.1776381841.git.nicolinc@nvidia.com>", "list_archive_url": null, "date": "2026-04-16T23:28:35", "name": "[v3,06/11] iommu: Defer __iommu_group_free_device() to be outside group->mutex", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "3c0e0e7b3024a9aaced2278e7c9b84c53e01bb87", "submitter": { "id": 82183, "url": "http://patchwork.ozlabs.org/api/people/82183/?format=api", "name": "Nicolin Chen", "email": "nicolinc@nvidia.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/3f5d229267d1f4d918641bc5b896f54b5c4b7782.1776381841.git.nicolinc@nvidia.com/mbox/", "series": [ { "id": 500217, "url": "http://patchwork.ozlabs.org/api/series/500217/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=500217", "date": "2026-04-16T23:28:31", "name": "iommu/arm-smmu-v3: Quarantine device upon ATC invalidation timeout", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/500217/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224152/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224152/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-52666-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=tZgIEqis;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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pr=C", "From": "Nicolin Chen <nicolinc@nvidia.com>", "To": "Will Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>, \"Joerg\n Roedel\" <joro@8bytes.org>, Bjorn Helgaas <bhelgaas@google.com>, \"Jason\n Gunthorpe\" <jgg@nvidia.com>", "CC": "\"Rafael J . Wysocki\" <rafael@kernel.org>, Len Brown <lenb@kernel.org>,\n\tPranjal Shrivastava <praan@google.com>, Mostafa Saleh <smostafa@google.com>,\n\tLu Baolu <baolu.lu@linux.intel.com>, Kevin Tian <kevin.tian@intel.com>,\n\t<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,\n\t<linux-kernel@vger.kernel.org>, <linux-acpi@vger.kernel.org>,\n\t<linux-pci@vger.kernel.org>, <vsethi@nvidia.com>, Shuai Xue\n\t<xueshuai@linux.alibaba.com>", "Subject": "[PATCH v3 06/11] iommu: Defer __iommu_group_free_device() to be\n outside group->mutex", "Date": "Thu, 16 Apr 2026 16:28:35 -0700", "Message-ID": "\n <3f5d229267d1f4d918641bc5b896f54b5c4b7782.1776381841.git.nicolinc@nvidia.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<cover.1776381841.git.nicolinc@nvidia.com>", "References": "<cover.1776381841.git.nicolinc@nvidia.com>", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-NV-OnPremToCloud": "ExternallySecured", "X-EOPAttributedMessage": "0", "X-MS-PublicTrafficType": "Email", "X-MS-TrafficTypeDiagnostic": "CO1PEPF00012E83:EE_|CY5PR12MB6406:EE_", "X-MS-Office365-Filtering-Correlation-Id": "91f09374-ca9b-463a-aebf-08de9c1002f0", "X-MS-Exchange-SenderADCheck": "1", "X-MS-Exchange-AntiSpam-Relay": "0", "X-Microsoft-Antispam": "\n\tBCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|7416014|22082099003|56012099003|18002099003;", "X-Microsoft-Antispam-Message-Info": "\n\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", "X-Forefront-Antispam-Report": "\n\tCIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(82310400026)(36860700016)(376014)(7416014)(22082099003)(56012099003)(18002099003);DIR:OUT;SFP:1101;", "X-MS-Exchange-AntiSpam-MessageData-ChunkCount": "1", "X-MS-Exchange-AntiSpam-MessageData-0": "\n\tos7agqf34mPecweExe+OIEBp8GwocEy/KZez7ZlGh3WTUuX4t1/X+ihltYyaBfcMwnrDv6DsA3jr0fyZo2iGWymV79AqFQRbXzf29ig+IgS5+O3ydSUEnJWf3SplM3+ll6oKsoJVolTQnyAjtmvqZs1YOksE2qvVkiWaYg32CQTS7792E9LYcNVP71elmsPUWp6nB8cdaDxtAAcnL7BEacXRWXXQABU9+8DkdF1ZeUACpFXfTpSeM2yQFmk+MLkCh/VHkeCypAqMU81wfwwKo1INvn6tD0FfPQFMl5MVtfsPBDFOIAosHXTJsw89SAxZfiZ9+LvUXEWm8Wgo6YDDNZv1uLoLX70DAcNOnu7mrU/h4a0bMHbRwTYlZmFsXogHq7RdJ+r7BzNDS3TfKphb9FA76PBZdbM7OUacIdJ7pguDcfA1+haPfBMAGgaKESY4", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "16 Apr 2026 23:29:31.5004\n (UTC)", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 91f09374-ca9b-463a-aebf-08de9c1002f0", "X-MS-Exchange-CrossTenant-Id": "43083d15-7273-40c1-b7db-39efd9ccc17a", "X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp": "\n TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com]", "X-MS-Exchange-CrossTenant-AuthSource": "\n\tCO1PEPF00012E83.namprd03.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Anonymous", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "CY5PR12MB6406" }, "content": "__iommu_group_remove_device() holds group->mutex across the entire call to\n__iommu_group_free_device() that performs sysfs removals, tracing, and the\nfinal kfree_rcu(). But in fact, most of these operations don't really need\nthe group->mutex.\n\nThe group_device structure will support a work_struct to quarantine broken\ndevices asynchronously. The work function must hold group->mutex to safely\nupdate group state. cancel_work_sync() must be called, to cancel that work\nbefore freeing the device. But doing so under group->mutex would deadlock\nif the worker is already running and waiting to acquire the same lock.\n\nSeparate the assertion from __iommu_group_free_device() to another helper\n__iommu_group_empty_assert_owner_cnt().\n\nDefer the __iommu_group_free_device() until the mutex is released.\n\nThis is a preparatory refactor with no functional change.\n\nSigned-off-by: Nicolin Chen <nicolinc@nvidia.com>\n---\n drivers/iommu/iommu.c | 35 +++++++++++++++++++++++------------\n 1 file changed, 23 insertions(+), 12 deletions(-)", "diff": "diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c\nindex d1be62a07904a..810e7b94a1ae2 100644\n--- a/drivers/iommu/iommu.c\n+++ b/drivers/iommu/iommu.c\n@@ -627,6 +627,19 @@ static struct iommu_domain *pasid_array_entry_to_domain(void *entry)\n \n DEFINE_MUTEX(iommu_probe_device_lock);\n \n+static void __iommu_group_empty_assert_owner_cnt(struct iommu_group *group)\n+{\n+\tlockdep_assert_held(&group->mutex);\n+\t/*\n+\t * If the group has become empty then ownership must have been\n+\t * released, and the current domain must be set back to NULL or\n+\t * the default domain.\n+\t */\n+\tif (list_empty(&group->devices))\n+\t\tWARN_ON(group->owner_cnt ||\n+\t\t\tgroup->domain != group->default_domain);\n+}\n+\n static int __iommu_probe_device(struct device *dev, struct list_head *group_list)\n {\n \tstruct iommu_group *group;\n@@ -700,10 +713,12 @@ static int __iommu_probe_device(struct device *dev, struct list_head *group_list\n \n err_remove_gdev:\n \tlist_del_rcu(&gdev->list);\n-\t__iommu_group_free_device(group, gdev);\n+\t__iommu_group_empty_assert_owner_cnt(group);\n err_put_group:\n \tiommu_deinit_device(dev);\n \tmutex_unlock(&group->mutex);\n+\tif (!IS_ERR(gdev))\n+\t\t__iommu_group_free_device(group, gdev);\n \tiommu_group_put(group);\n \n \treturn ret;\n@@ -732,20 +747,13 @@ static void __iommu_group_free_device(struct iommu_group *group,\n {\n \tstruct device *dev = grp_dev->dev;\n \n+\tlockdep_assert_not_held(&group->mutex);\n+\n \tsysfs_remove_link(group->devices_kobj, grp_dev->name);\n \tsysfs_remove_link(&dev->kobj, \"iommu_group\");\n \n \ttrace_remove_device_from_group(group->id, dev);\n \n-\t/*\n-\t * If the group has become empty then ownership must have been\n-\t * released, and the current domain must be set back to NULL or\n-\t * the default domain.\n-\t */\n-\tif (list_empty(&group->devices))\n-\t\tWARN_ON(group->owner_cnt ||\n-\t\t\tgroup->domain != group->default_domain);\n-\n \tkfree(grp_dev->name);\n \tkfree_rcu(grp_dev, rcu);\n }\n@@ -754,7 +762,7 @@ static void __iommu_group_free_device(struct iommu_group *group,\n static void __iommu_group_remove_device(struct device *dev)\n {\n \tstruct iommu_group *group = dev->iommu_group;\n-\tstruct group_device *device;\n+\tstruct group_device *device, *to_free = NULL;\n \n \tmutex_lock(&group->mutex);\n \tfor_each_group_device(group, device) {\n@@ -762,15 +770,18 @@ static void __iommu_group_remove_device(struct device *dev)\n \t\t\tcontinue;\n \n \t\tlist_del_rcu(&device->list);\n-\t\t__iommu_group_free_device(group, device);\n+\t\t__iommu_group_empty_assert_owner_cnt(group);\n \t\tif (dev_has_iommu(dev))\n \t\t\tiommu_deinit_device(dev);\n \t\telse\n \t\t\tdev->iommu_group = NULL;\n+\t\tto_free = device;\n \t\tbreak;\n \t}\n \tmutex_unlock(&group->mutex);\n \n+\tif (to_free)\n+\t\t__iommu_group_free_device(group, to_free);\n \t/*\n \t * Pairs with the get in iommu_init_device() or\n \t * iommu_group_add_device()\n", "prefixes": [ "v3", "06/11" ] }