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Fri, 4 Jul 2025 18:13:55 -0700 From: Nicolin Chen To: , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v8 01/29] iommufd: Report unmapped bytes in the error path of iopt_unmap_iova_range Date: Fri, 4 Jul 2025 18:13:17 -0700 Message-ID: <7da10d5887b88ef9d1231dba152bbd83f5403aac.1751677708.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000042AB:EE_|CH3PR12MB7570:EE_ X-MS-Office365-Filtering-Correlation-Id: 3b44dbb3-6294-49a0-26d6-08ddbb613847 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|82310400026|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Ijd5M+CU7KgGra9vu1JIc0RugEPa4V/U3PDBN2bmZKyJqQI0d2ny5Tq3AXd7?= =?us-ascii?Q?ADSXbUTZGS8JCxsT2Vcrz8c4A6LpcGTvjVWeDW82q2+IpGUU8wG/GWw4rTTP?= =?us-ascii?Q?O4aCrMGIZOGIPULuHZshgWuLc4VKdDgtF6uTcJL9bc5VSXCoZ3moJDNrpOGn?= =?us-ascii?Q?QPvgtg1z92FZ7TXTFHYkq4V/l71mgyAi8NlHfYOoMDYfZKl8ikdlQOGtrtcw?= =?us-ascii?Q?BzDJvpjOOpEXG4qWVkU+mYNtNii3ubLvDhnfRXuH3iRMbP8WMn1m9J+G9N7t?= =?us-ascii?Q?+e3KpsdHAncGSAYwbJZpIn1OmBDWIxo7mO6ZCQU5MxIVELHc07ExuXKujVd9?= =?us-ascii?Q?9CnzDRnwrJ9xQ6w2zGNBgpvbDf4EcFgIz4q0oEJ69XqMRkL3ckW6IkuJ/g/l?= =?us-ascii?Q?nyhXzOrR2i5BJ8xCnJ4XwqSjBAqu4+wBQHUFhULJwSc284noW8/XmSZK0awQ?= =?us-ascii?Q?Xcbtu3+M0rRB1jaS7GG12/PEBO6UhHs1i3nH7kuBERx1oEnpDs3ZTKVarIFN?= =?us-ascii?Q?xDy0h7JSB+X5NXrwhN0JuEjToPGsSitboQ/1NPUM09+E0W0lhG1t+PcyoNX8?= =?us-ascii?Q?YWC7vn6qgF/mUwi+2A5e0KbI0fjZ0pJcU8JZzbAxW5nARfKaEswMMEZKB4IT?= =?us-ascii?Q?bv0AQPMD3vbE5shxJRVShPTvMr8xXov9H0byrL6SCPcIZKp27/Qcts0RXAG5?= =?us-ascii?Q?/p9iivN1yBarklG0ixuIwxQlbjN7+Xv4NJNf5/yJLINKfdTRR8f8MneNjjat?= =?us-ascii?Q?lzYSBI6dcYeVR4ERgFa4iKw41Gax0IcMFguf19YX+Rio39dRT16h8bCK8hO3?= =?us-ascii?Q?J6MuZTgHL5x9z908S8rTaC6xUgM81QqPxxyTw+7UXs1LPwyNOeNdk5VeqWPe?= =?us-ascii?Q?SfokATxSYe64Pobh6GXIVi0OhzIzCgnLAUJ1c8sqwy2HwvgCFCvgTHluZaDk?= =?us-ascii?Q?hTeA5riHUQEkDpc0S6oAnDPl2RHYoTMQiL/moqMenyjI184lXDjVHNkYPMIL?= =?us-ascii?Q?rdiF+RJNwHflqHLwIG0Yly5q28t59GikX0o/93lxUandyOyZjregw7zt9KLS?= =?us-ascii?Q?5hidQuCLJ/HU+mNl2Ec4F5aguK5ZYm/kS5FXrFh2crRyh93jFOGmJVvbmpM+?= =?us-ascii?Q?IeD8PXOGlNlu79C9q49j9h2fEOyyQse+KPhsQjYd3f+OxBMYD1Y8l5SWLODg?= =?us-ascii?Q?99BvHUy8rLPyoZs7YefmGBhi47Dt+J6h21A/kR3lBvIl3pLHJuUjffbJx3TB?= =?us-ascii?Q?njVZkQ9qCASlGBQt445BA9Qvfp0j2UOmJ9kuHJXdP16+9omKVbu3vwd2fFsr?= =?us-ascii?Q?2gUonS277X/qdSZCkLSBx+Ip5xyUG/pWnP+RO51+DvIZa8Zp9zRwSsQDGWW8?= =?us-ascii?Q?yb8MnjATjepVo7OoW5wuU4BIla6aIbdAWlbdIYLnmLjPQLkp1INAyESrmQ1A?= =?us-ascii?Q?VuaxLgWDEyOJeiYIuutq3ZDM9/qpDp5tJwiMaNdoSedxc9e9cw8pB5k4DKG5?= =?us-ascii?Q?WRg8Iig1pcXyLTTJcM+esGRhgwvIQQWQyEm1?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(1800799024)(82310400026)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jul 2025 01:13:58.5918 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3b44dbb3-6294-49a0-26d6-08ddbb613847 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000042AB.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7570 There are callers that read the unmapped bytes even when rc != 0. Thus, do not forget to report it in the error path too. Fixes: 8d40205f6093 ("iommufd: Add kAPI toward external drivers for kernel access") Cc: stable@vger.kernel.org Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/io_pagetable.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/iommufd/io_pagetable.c b/drivers/iommu/iommufd/io_pagetable.c index 13d010f19ed1..22fc3a12109f 100644 --- a/drivers/iommu/iommufd/io_pagetable.c +++ b/drivers/iommu/iommufd/io_pagetable.c @@ -743,8 +743,10 @@ static int iopt_unmap_iova_range(struct io_pagetable *iopt, unsigned long start, iommufd_access_notify_unmap(iopt, area_first, length); /* Something is not responding to unmap requests. */ tries++; - if (WARN_ON(tries > 100)) - return -EDEADLOCK; + if (WARN_ON(tries > 100)) { + rc = -EDEADLOCK; + goto out_unmapped; + } goto again; } @@ -766,6 +768,7 @@ static int iopt_unmap_iova_range(struct io_pagetable *iopt, unsigned long start, out_unlock_iova: up_write(&iopt->iova_rwsem); up_read(&iopt->domains_rwsem); +out_unmapped: if (unmapped) *unmapped = unmapped_bytes; return rc; -- 2.43.0