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<ionut.nechita@windriver.com>", "To": "Bjorn Helgaas <helgaas@kernel.org>", "Cc": "Bjorn Helgaas <bhelgaas@google.com>, Sebastian Ott <sebott@linux.ibm.com>,\n Niklas Schnelle <schnelle@linux.ibm.com>,\n Benjamin Block <bblock@linux.ibm.com>,\n Farhan Ali <alifm@linux.ibm.com>,\n Julian Ruess <julianr@linux.ibm.com>,\n Ionut Nechita <sunlightlinux@gmail.com>, linux-pci@vger.kernel.org,\n linux-kernel@vger.kernel.org,\n Ionut Nechita <ionut.nechita@windriver.com>", "Subject": "[PATCH v1 0/1] PCI/IOV: Fix unprotected sriov_del_vfs() against\n concurrent hotplug", "Date": "Sat, 14 Feb 2026 21:32:35 +0200", "Message-ID": "<20260214193235.262219-3-ionut.nechita@windriver.com>", "X-Mailer": "git-send-email 2.53.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "VI1PR0102CA0073.eurprd01.prod.exchangelabs.com\n (2603:10a6:803:15::14) To MN2PR11MB3885.namprd11.prod.outlook.com\n (2603:10b6:208:151::27)", "Precedence": "bulk", "X-Mailing-List": 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engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-02-14_02,2026-02-13_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n spamscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 bulkscore=0\n clxscore=1011 malwarescore=0 suspectscore=0 impostorscore=0 adultscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602140163" }, "content": "From: Ionut Nechita <ionut.nechita@windriver.com>\n\nAfter reverting commit 05703271c3cd (\"PCI/IOV: Add PCI rescan-remove\nlocking when enabling/disabling SR-IOV\") and moving the lock to\nsriov_numvfs_store(), the path through driver .remove() (e.g. rmmod,\nor manual unbind) that calls pci_disable_sriov() directly remains\nunprotected against concurrent hotplug events. This affects any SR-IOV\ncapable driver that calls pci_disable_sriov() from its .remove()\ncallback (i40e, ice, mlx5, bnxt, etc.).\n\nOn s390, platform-generated hot-unplug events for VFs can race with\nsriov_del_vfs() when a PF driver is being unloaded. The platform event\nhandler takes pci_rescan_remove_lock, but sriov_del_vfs() does not,\nleading to double removal and list corruption.\n\nThis patch introduces owner tracking for pci_rescan_remove_lock via a\nnew pci_lock_rescan_remove_nested() helper that avoids deadlock when\ncalled from paths that already hold the lock, while still providing\nfull serialization against concurrent hotplug from other tasks.\n\nTesting:\n- Code path analysis verified for all call chains involving\n sriov_add_vfs() and sriov_del_vfs().\n- The race condition with platform-generated hotplug events is\n specific to s390/s390x. Testing on s390 hardware would be\n appreciated to confirm the fix addresses the original issue.\n\nIonut Nechita (1):\n PCI/IOV: Add nested locking in sriov_add_vfs/sriov_del_vfs for\n complete serialization\n\n drivers/pci/iov.c | 10 ++++++++++\n drivers/pci/pci.h | 1 +\n drivers/pci/probe.c | 12 ++++++++++++\n 3 files changed, 23 insertions(+)" }