{"id":2225560,"url":"http://patchwork.ozlabs.org/api/patches/2225560/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/4625becce42253d53a615efccc33c7d91ccf5312.1776756380.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":"<4625becce42253d53a615efccc33c7d91ccf5312.1776756380.git.ionut.nechita@windriver.com>","list_archive_url":null,"date":"2026-04-21T07:34:21","name":"[v13,2/2] PCI: Fix AB-BA deadlock between device_lock and pci_rescan_remove_lock in 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engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n 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\nremove_store() calls pci_stop_and_remove_bus_device_locked() which\ntakes pci_rescan_remove_lock first, then device_lock during driver\nrelease. Meanwhile, unbind_store() takes device_lock first (via\ndevice_driver_detach), and the driver's .remove() callback may call\npci_disable_sriov() -> sriov_del_vfs() -> pci_lock_rescan_remove().\n\nThis creates an AB-BA deadlock:\n\n CPU0 (remove_store) CPU1 (unbind_store)\n -------------------- --------------------\n pci_lock_rescan_remove()\n device_lock()\n driver .remove()\n sriov_del_vfs()\n pci_lock_rescan_remove() <-- WAITS\n pci_stop_bus_device()\n device_release_driver()\n device_lock() <-- WAITS\n\nFix this by first marking the device as dead using kill_device() to\nprevent any new driver from binding, then calling device_release_driver()\nbefore pci_stop_and_remove_bus_device_locked().\n\nMarking the device dead closes the race window between unbinding and\nremoval where a new driver could theoretically bind: once the dead flag\nis set, the device core will refuse any new driver probe.\n\nAfter device_release_driver() returns, the driver is already unbound,\nso the subsequent device_release_driver() call inside\npci_stop_and_remove_bus_device_locked() becomes a no-op.\n\nFixes: a5338e365c45 (\"PCI/IOV: Fix race between SR-IOV enable/disable and hotplug\")\nReported-by: Guenter Roeck \nCloses: https://lore.kernel.org/linux-pci/0ca9e675-478c-411d-be32-e2d81439288f@roeck-us.net/\nReported-by: Benjamin Block \nCloses: https://lore.kernel.org/linux-pci/20260317090149.GA3835708@chlorum.ategam.org/\nSuggested-by: Benjamin Block \nCc: stable@vger.kernel.org\nReviewed-by: Niklas Schnelle \nReviewed-by: Benjamin Block \nTested-by: Benjamin Block \nSigned-off-by: Ionut Nechita \n---\n drivers/pci/pci-sysfs.c | 30 +++++++++++++++++++++++++++++-\n 1 file changed, 29 insertions(+), 1 deletion(-)","diff":"diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c\nindex d37860841260..1426328e9f05 100644\n--- a/drivers/pci/pci-sysfs.c\n+++ b/drivers/pci/pci-sysfs.c\n@@ -521,8 +521,36 @@ static ssize_t remove_store(struct device *dev, struct device_attribute *attr,\n \tif (kstrtoul(buf, 0, &val) < 0)\n \t\treturn -EINVAL;\n \n-\tif (val && device_remove_file_self(dev, attr))\n+\tif (val && device_remove_file_self(dev, attr)) {\n+\t\t/*\n+\t\t * Mark the device as dead so that no new driver can bind\n+\t\t * between the unbind and the removal below. Once the\n+\t\t * dead flag is set, the device core will refuse any new\n+\t\t * driver probe.\n+\t\t */\n+\t\tdevice_lock(dev);\n+\t\tkill_device(dev);\n+\t\tdevice_unlock(dev);\n+\n+\t\t/*\n+\t\t * Unbind the driver before removing the device to avoid\n+\t\t * an AB-BA deadlock between device_lock and\n+\t\t * pci_rescan_remove_lock. Without this, remove_store\n+\t\t * takes pci_rescan_remove_lock first (via\n+\t\t * pci_stop_and_remove_bus_device_locked) and then\n+\t\t * device_lock during driver release, while a concurrent\n+\t\t * unbind_store (or sriov_numvfs_store) takes device_lock\n+\t\t * first and then pci_rescan_remove_lock (via\n+\t\t * sriov_del_vfs), creating a circular dependency.\n+\t\t *\n+\t\t * By unbinding first, the driver's .remove() callback\n+\t\t * (including any SR-IOV VF cleanup) completes before\n+\t\t * pci_rescan_remove_lock is acquired, ensuring both\n+\t\t * paths take locks in the same order.\n+\t\t */\n+\t\tdevice_release_driver(dev);\n \t\tpci_stop_and_remove_bus_device_locked(to_pci_dev(dev));\n+\t}\n \treturn count;\n }\n static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,\n","prefixes":["v13","2/2"]}