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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jun 2025 17:04:57.1196 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9b4238b6-a9a1-4952-8136-08dda453197b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E0.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4451 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250605_180509_539614_002678D6 X-CRM114-Status: GOOD ( 12.79 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jun 05, 2025 at 12:16:48PM -0300, Jason Gunthorpe wrote: > On Wed, Jun 04, 2025 at 09:11:07PM -0700, Nicolin Chen wrote: > > > I found the entire ictx would be locked by iommufd_access_create(), > > then the release fop couldn't even get invoked to destroy objects. > > Yes, that makes sense.. > > It looks to me like you can safely leave ictx as NULL instead of > adding a flag? That would be nicer than leaving a unrefcounted > pointer floating around.. Hmm, there are a few iommufd_get_object calls using access->ictx in iommufd_access_attach() and iommufd_access_destroy(). We could have a set of internal access APIs to leave access->ictx as NULL, as an internal caller has an ictx to pass in. It's going to be a larger change though.. Thanks Nicolin