{"id":2223946,"url":"http://patchwork.ozlabs.org/api/patches/2223946/?format=json","web_url":"http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/db8d9a0ea83315a128671ad93f4a77c5bb7ed224.1776340676.git.saviram@nvidia.com/","project":{"id":15,"url":"http://patchwork.ozlabs.org/api/projects/15/?format=json","name":"Ubuntu Kernel","link_name":"ubuntu-kernel","list_id":"kernel-team.lists.ubuntu.com","list_email":"kernel-team@lists.ubuntu.com","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-16T12:14:06","name":"[SRU,N:linux-bluefield,v1,2/2] UBUNTU: SAUCE: vfio/pci: Use the correct ref count","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"5b89cf6dbfaf70d800a79f80058caaf98885b055","submitter":{"id":91107,"url":"http://patchwork.ozlabs.org/api/people/91107/?format=json","name":"Stav Aviram","email":"saviram@nvidia.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/db8d9a0ea83315a128671ad93f4a77c5bb7ed224.1776340676.git.saviram@nvidia.com/mbox/","series":[{"id":500146,"url":"http://patchwork.ozlabs.org/api/series/500146/?format=json","web_url":"http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=500146","date":"2026-04-16T12:14:04","name":"UBUNTU: SAUCE: vfio: Export vfio device get and put registration helpers","version":1,"mbox":"http://patchwork.ozlabs.org/series/500146/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2223946/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223946/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=VgKOt724;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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helo=mail.nvidia.com; pr=C","permerror client-ip=52.101.52.2;\n envelope-from=saviram@nvidia.com;\n helo=BL2PR02CU003.outbound.protection.outlook.com"],"From":"Stav Aviram ","To":"","Subject":"[SRU][N:linux-bluefield][PATCH v1 2/2] UBUNTU: SAUCE: vfio/pci: Use\n the correct ref count","Date":"Thu, 16 Apr 2026 15:14:06 +0300","Message-ID":"\n ","X-Mailer":"git-send-email 2.47.0","In-Reply-To":"","References":"","MIME-Version":"1.0","X-Originating-IP":"[10.126.230.37]","X-ClientProxiedBy":"rnnvmail202.nvidia.com (10.129.68.7) To\n rnnvmail201.nvidia.com (10.129.68.8)","X-EOPAttributedMessage":"0","X-MS-PublicTrafficType":"Email","X-MS-TrafficTypeDiagnostic":"DS2PEPF000061C7:EE_|DM4PR12MB6255:EE_","X-MS-Office365-Filtering-Correlation-Id":"040d121a-de0e-4a81-d81b-08de9bb1c170","X-MS-Exchange-SenderADCheck":"1","X-MS-Exchange-AntiSpam-Relay":"0","X-Microsoft-Antispam":"BCL:0;\n ARA:13230040|376014|36860700016|82310400026|1800799024|13003099007|22082099003|56012099003|18002099003;","X-Microsoft-Antispam-Message-Info":"\n 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","X-Forefront-Antispam-Report":"CIP:216.228.117.160; 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Ip=[216.228.117.160];\n Helo=[mail.nvidia.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n DS2PEPF000061C7.namprd02.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"DM4PR12MB6255","X-BeenThere":"kernel-team@lists.ubuntu.com","X-Mailman-Version":"2.1.20","Precedence":"list","List-Id":"Kernel team discussions ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"content":"From: Amir Tzin \n\nBugLink: https://bugs.launchpad.net/bugs/2148554\n\nCited patch, on its cleanup flows, fails to clear the vfio device\nrefcount. Instead it calls vfio_put_device triggering [1].\n\n[1]\n[] Call trace:\n[] refcount_warn_saturate+0x140/0×238\n[] kobject_put+0x12c/0×160\n[] put_device+0x20/0×58\n[] vfio_pci_dma_buf_release+0x60/0×98 [vfio_pci_core]\n[] dma_buf_release+0x4c/0xc8\n[] dentry_kill+0xec/0×210\n[] dput+0x94/0×110\n[] fput+0xd8/0×318\n[] fput_sync+0x78/0xb0\n[] arm64_sys_close+0x44/0xa0\n[] invoke_syscall+0x7c/0×130\n[] el0_svc_common.constprop.0+0x4c/0×140\n[] do_el0_svc+0x28/0×58\n[] el0_svc+0x40/0×1c0\n[] el0t_64_sync+0x1b0/0×1b8\n[] el0t_64_sync_handler+0x148/0×158\n[] -[ end trace 0000000000000000 ]—-\n\nIssue: 4933425\nFixes: 25538ae6b589 (\"UBUNTU: SAUCE: vfio/pci: Allow MMIO regions to be exported through dma-buf\")\nSigned-off-by: Amir Tzin \n---\n drivers/vfio/pci/dma_buf.c | 4 ++--\n 1 file changed, 2 insertions(+), 2 deletions(-)","diff":"diff --git a/drivers/vfio/pci/dma_buf.c b/drivers/vfio/pci/dma_buf.c\nindex 0ad8545cbac5..d8c11816211f 100644\n--- a/drivers/vfio/pci/dma_buf.c\n+++ b/drivers/vfio/pci/dma_buf.c\n@@ -147,7 +147,7 @@ static void vfio_pci_dma_buf_release(struct dma_buf *dmabuf)\n \t\tdown_write(&priv->vdev->memory_lock);\n \t\tlist_del_init(&priv->dmabufs_elm);\n \t\tup_write(&priv->vdev->memory_lock);\n-\t\tvfio_put_device(&priv->vdev->vdev);\n+\t\tvfio_device_put_registration(&priv->vdev->vdev);\n \t}\n \tkfree(priv);\n }\n@@ -258,7 +258,7 @@ void vfio_pci_dma_buf_cleanup(struct vfio_pci_core_device *vdev)\n \t\tpriv->revoked = true;\n \t\tdma_buf_move_notify(priv->dmabuf);\n \t\tdma_resv_unlock(priv->dmabuf->resv);\n-\t\tvfio_put_device(&vdev->vdev);\n+\t\tvfio_device_put_registration(&vdev->vdev);\n \t\tdma_buf_put(priv->dmabuf);\n \t}\n \tup_write(&vdev->memory_lock);\n","prefixes":["SRU","N:linux-bluefield","v1","2/2"]}