{"id":2225552,"url":"http://patchwork.ozlabs.org/api/patches/2225552/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/dd7e59d18ac031af42a65dc0207dc6d9f5780e09.1776755661.git.ionut.nechita@windriver.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/projects/28/?format=json","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":"","list_archive_url":null,"date":"2026-04-21T07:19:31","name":"[v12,1/2] PCI/IOV: Make pci_lock_rescan_remove() reentrant and protect sriov_add_vfs/sriov_del_vfs","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"e03dd71109a493d6d484b3657ee25e7e9507066a","submitter":{"id":92607,"url":"http://patchwork.ozlabs.org/api/people/92607/?format=json","name":"Ionut Nechita (Wind 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","To":"linux-pci@vger.kernel.org, bhelgaas@google.com","Cc":"helgaas@kernel.org, sebott@linux.ibm.com, schnelle@linux.ibm.com,\n bblock@linux.ibm.com, linux@roeck-us.net, lukas@wunner.de,\n stable@vger.kernel.org, linux-kernel@vger.kernel.org,\n intel-xe@lists.freedesktop.org, matthew.brost@intel.com,\n michal.wajdeczko@intel.com, piotr.piorkowski@intel.com,\n dtatulea@nvidia.com, mani@kernel.org, kbusch@kernel.org,\n lkml@mageta.org, alifm@linux.ibm.com, julianr@linux.ibm.com,\n ionut_n2001@yahoo.com, sunlightlinux@gmail.com","Subject":"[PATCH v12 1/2] PCI/IOV: Make pci_lock_rescan_remove() reentrant and\n protect sriov_add_vfs/sriov_del_vfs","Date":"Tue, 21 Apr 2026 10:19:31 +0300","Message-ID":"\n ","X-Mailer":"git-send-email 2.53.0","In-Reply-To":"","References":"","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-ClientProxiedBy":"VIXP296CA0001.AUTP296.PROD.OUTLOOK.COM\n (2603:10a6:800:2a9::16) To SJ2PR11MB7546.namprd11.prod.outlook.com\n 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definitions=2026-04-21_01,2026-04-20_02,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n clxscore=1015 suspectscore=0 bulkscore=0 impostorscore=0 phishscore=0\n spamscore=0 adultscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604210070"},"content":"From: Ionut Nechita \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\nWe cannot use a plain mutex_lock() here because sriov_del_vfs() may also\nbe called from paths that already hold pci_rescan_remove_lock (e.g.\nremove_store -> pci_stop_and_remove_bus_device_locked, or\nsriov_numvfs_store with the lock taken by the previous patch). Using\nmutex_lock() in those cases would deadlock.\n\nMake pci_lock_rescan_remove() itself reentrant using mutex_get_owner()\nand a reentrant depth counter, as suggested by Lukas Wunner and\nBenjamin Block, since these recursive locking scenarios exist elsewhere\nin the PCI subsystem:\n - If the lock is already held by the current task (checked via\n mutex_get_owner()): increments the reentrant counter and returns\n without re-acquiring, avoiding deadlock.\n - If the lock is held by another task: blocks until the lock is\n released, providing complete serialization.\n - If the lock is not held: acquires the mutex normally.\n\npci_unlock_rescan_remove() decrements the reentrant counter if it is\nnon-zero, otherwise releases the mutex.\n\nThis approach keeps the API unchanged: callers simply pair lock/unlock\ncalls without needing to track any return value or use separate\nreentrant variants.\n\nAdd pci_lock_rescan_remove()/pci_unlock_rescan_remove() calls to\nsriov_add_vfs() and sriov_del_vfs() to protect VF addition and\nremoval against concurrent hotplug events.\n\nRemove the rescan/remove locking from sriov_numvfs_store() that was\nintroduced by commit a5338e365c45 (\"PCI/IOV: Fix race between SR-IOV\nenable/disable and hotplug\"), since the locking is now handled directly\nin sriov_add_vfs() and sriov_del_vfs() where it is actually needed,\nreducing the lock scope.\n\nFixes: 18f9e9d150fc (\"PCI/IOV: Factor out sriov_add_vfs()\")\nFixes: 05703271c3cd (\"PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV\")\nFixes: a5338e365c45 (\"PCI/IOV: Fix race between SR-IOV enable/disable and hotplug\")\nCc: stable@vger.kernel.org\nSuggested-by: Lukas Wunner \nSuggested-by: Benjamin Block \nReviewed-by: Benjamin Block \nTested-by: Benjamin Block \nReviewed-by: Niklas Schnelle \nTested-by: Niklas Schnelle # s390\nSigned-off-by: Ionut Nechita \n---\n drivers/pci/iov.c | 9 +++++----\n drivers/pci/probe.c | 11 +++++++++--\n 2 files changed, 14 insertions(+), 6 deletions(-)","diff":"diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c\nindex 91ac4e37ecb9..7ed902539051 100644\n--- a/drivers/pci/iov.c\n+++ b/drivers/pci/iov.c\n@@ -495,9 +495,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,\n \n \tif (num_vfs == 0) {\n \t\t/* disable VFs */\n-\t\tpci_lock_rescan_remove();\n \t\tret = pdev->driver->sriov_configure(pdev, 0);\n-\t\tpci_unlock_rescan_remove();\n \t\tgoto exit;\n \t}\n \n@@ -509,9 +507,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,\n \t\tgoto exit;\n \t}\n \n-\tpci_lock_rescan_remove();\n \tret = pdev->driver->sriov_configure(pdev, num_vfs);\n-\tpci_unlock_rescan_remove();\n \tif (ret < 0)\n \t\tgoto exit;\n \n@@ -633,15 +629,18 @@ static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)\n \tif (dev->no_vf_scan)\n \t\treturn 0;\n \n+\tpci_lock_rescan_remove();\n \tfor (i = 0; i < num_vfs; i++) {\n \t\trc = pci_iov_add_virtfn(dev, i);\n \t\tif (rc)\n \t\t\tgoto failed;\n \t}\n+\tpci_unlock_rescan_remove();\n \treturn 0;\n failed:\n \twhile (i--)\n \t\tpci_iov_remove_virtfn(dev, i);\n+\tpci_unlock_rescan_remove();\n \n \treturn rc;\n }\n@@ -766,8 +765,10 @@ static void sriov_del_vfs(struct pci_dev *dev)\n \tstruct pci_sriov *iov = dev->sriov;\n \tint i;\n \n+\tpci_lock_rescan_remove();\n \tfor (i = 0; i < iov->num_VFs; i++)\n \t\tpci_iov_remove_virtfn(dev, i);\n+\tpci_unlock_rescan_remove();\n }\n \n static void sriov_disable(struct pci_dev *dev)\ndiff --git a/drivers/pci/probe.c b/drivers/pci/probe.c\nindex b63cd0c310bc..ec45783230dc 100644\n--- a/drivers/pci/probe.c\n+++ b/drivers/pci/probe.c\n@@ -3513,16 +3513,23 @@ EXPORT_SYMBOL_GPL(pci_rescan_bus);\n * routines should always be executed under this mutex.\n */\n DEFINE_MUTEX(pci_rescan_remove_lock);\n+static size_t pci_rescan_remove_reentrant_count;\n \n void pci_lock_rescan_remove(void)\n {\n-\tmutex_lock(&pci_rescan_remove_lock);\n+\tif (mutex_get_owner(&pci_rescan_remove_lock) == (unsigned long)current)\n+\t\tpci_rescan_remove_reentrant_count++;\n+\telse\n+\t\tmutex_lock(&pci_rescan_remove_lock);\n }\n EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);\n \n void pci_unlock_rescan_remove(void)\n {\n-\tmutex_unlock(&pci_rescan_remove_lock);\n+\tif (pci_rescan_remove_reentrant_count > 0)\n+\t\tpci_rescan_remove_reentrant_count--;\n+\telse\n+\t\tmutex_unlock(&pci_rescan_remove_lock);\n }\n EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);\n \n","prefixes":["v12","1/2"]}