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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 spamscore=0 clxscore=1015 bulkscore=0 phishscore=0 impostorscore=0\n malwarescore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0\n suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc=\n route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000\n definitions=main-2604210072"},"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 by tracking the current\nowner task and a recursion depth counter, as suggested by Lukas Wunner\nand Benjamin Block, since these recursive locking scenarios exist\nelsewhere in the PCI subsystem:\n - If the lock is already held by the current task (owner == current):\n increments the depth counter and returns without re-acquiring,\n avoiding deadlock.\n - If the lock is held by another task: blocks until the lock is\n released, then records the owner and sets depth to 1.\n - If the lock is not held: acquires the mutex normally.\n\npci_unlock_rescan_remove() decrements the depth counter and releases\nthe mutex (clearing the owner) only when the depth reaches zero.\nA WARN_ON catches mismatched unlock calls from tasks that do not own\nthe lock.\n\nThis avoids relying on mutex_get_owner(), which is not exported to\nmodules and caused link failures for builds that inline this code\noutside of the core kernel image.\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 \nSigned-off-by: Ionut Nechita \n---\n drivers/pci/iov.c | 9 +++++----\n drivers/pci/probe.c | 18 ++++++++++++++++--\n 2 files changed, 21 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..0e62081bc5e5 100644\n--- a/drivers/pci/probe.c\n+++ b/drivers/pci/probe.c\n@@ -3513,16 +3513,30 @@ 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 struct task_struct *pci_rescan_remove_owner;\n+static unsigned int pci_rescan_remove_depth;\n \n void pci_lock_rescan_remove(void)\n {\n-\tmutex_lock(&pci_rescan_remove_lock);\n+\tif (pci_rescan_remove_owner == current) {\n+\t\tpci_rescan_remove_depth++;\n+\t} else {\n+\t\tmutex_lock(&pci_rescan_remove_lock);\n+\t\tpci_rescan_remove_owner = current;\n+\t\tpci_rescan_remove_depth = 1;\n+\t}\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 (WARN_ON(pci_rescan_remove_owner != current))\n+\t\treturn;\n+\n+\tif (--pci_rescan_remove_depth == 0) {\n+\t\tpci_rescan_remove_owner = NULL;\n+\t\tmutex_unlock(&pci_rescan_remove_lock);\n+\t}\n }\n EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);\n \n","prefixes":["v13","1/2"]}