Patch Detail
get:
Show a patch.
patch:
Update a patch.
put:
Update a patch.
GET /api/patches/2196551/?format=api
{ "id": 2196551, "url": "http://patchwork.ozlabs.org/api/patches/2196551/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260214193235.262219-5-ionut.nechita@windriver.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "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": "<20260214193235.262219-5-ionut.nechita@windriver.com>", "list_archive_url": null, "date": "2026-02-14T19:32:37", "name": "[v1,1/1] PCI/IOV: Add nested locking in sriov_add_vfs/sriov_del_vfs for complete serialization", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "61ec71066b776684242a387198a16ffe8c8e1849", "submitter": { "id": 92607, "url": "http://patchwork.ozlabs.org/api/people/92607/?format=api", "name": "Ionut Nechita (Wind River)", "email": "ionut.nechita@windriver.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260214193235.262219-5-ionut.nechita@windriver.com/mbox/", "series": [ { "id": 492192, "url": "http://patchwork.ozlabs.org/api/series/492192/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=492192", "date": "2026-02-14T19:32:35", "name": "PCI/IOV: Fix unprotected sriov_del_vfs() against concurrent hotplug", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492192/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196551/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196551/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-47290-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", 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h=cc:content-transfer-encoding:content-type:date:from\n\t:in-reply-to:message-id:mime-version:references:subject:to; s=\n\tPPS06212021; bh=JcMkbpOC1uAJ1YlzyTspHYrJuZRirw7GYwKjB7tXR7Y=; b=\n\th1Z8g7gm5nxU7BkUIatlIxWWsQeSBqG1nH8Om5ndqQUN3vmvd49McXLcgJAHNBMc\n\tkKJ4l+Q58z7zGJljcmihc3/AEgr+jTnjhWJZ84DdaLQ3OnulkJTF+u0P9KGktIg8\n\thj+rT/TgZfq0vw3cU3pXo6eIxPBMsCwfWK3Sh4wMfbY0rRCaxJBTa/ZLoAg4kwA0\n\tOhlc+aiZkVao/qdk50Aw0gTDOtkFVUFV5KsOaIy81L9D8RqkmePdL5LOXGShD6C+\n\tbEJqbyU+JRUKU33rtZufAQ2HsAHa58vrVZnFJaHrx04oJ4mji0JJwccnHKudT0sz\n\tGjHjUkhv85z2Ko+Bob+6Lg==", "From": "\"Ionut Nechita (Wind River)\" <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>, stable@vger.kernel.org,\n Ionut Nechita <ionut_n2001@yahoo.com>", "Subject": "[PATCH v1 1/1] PCI/IOV: Add nested locking in\n sriov_add_vfs/sriov_del_vfs for complete serialization", "Date": "Sat, 14 Feb 2026 21:32:37 +0200", "Message-ID": "<20260214193235.262219-5-ionut.nechita@windriver.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260214193235.262219-3-ionut.nechita@windriver.com>", "References": "<20260214193235.262219-3-ionut.nechita@windriver.com>", "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": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": 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"X-Proofpoint-Virus-Version": "vendor=baseguard\n 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\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\nInstead, introduce owner tracking for pci_rescan_remove_lock via a new\npci_lock_rescan_remove_nested() helper. This function checks if the\ncurrent task already holds the lock:\n - If the lock is not held: acquires it and returns true, providing\n full serialization against concurrent hotplug events (including\n platform-generated events on s390).\n - If the lock is already held by the current task (nested call from\n remove_store or sriov_numvfs_store paths): returns false without\n re-acquiring, avoiding deadlock while the caller already provides\n the necessary serialization.\n - If the lock is held by another task (concurrent hotplug): blocks\n until the lock is released, then acquires it, providing complete\n serialization. This is the key improvement over a trylock approach.\n\nFixes: 18f9e9d150fc (\"PCI/IOV: Factor out sriov_add_vfs()\")\nCc: stable@vger.kernel.org\nSigned-off-by: Ionut Nechita <ionut_n2001@yahoo.com>\nSigned-off-by: Ionut Nechita <ionut.nechita@windriver.com>\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(+)", "diff": "diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c\nindex 4a659c34935e..38372ac0e2ad 100644\n--- a/drivers/pci/iov.c\n+++ b/drivers/pci/iov.c\n@@ -629,19 +629,25 @@ static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)\n {\n \tunsigned int i;\n \tint rc;\n+\tbool nested;\n \n \tif (dev->no_vf_scan)\n \t\treturn 0;\n \n+\tnested = !pci_lock_rescan_remove_nested();\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+\tif (!nested)\n+\t\tpci_unlock_rescan_remove();\n \treturn 0;\n failed:\n \twhile (i--)\n \t\tpci_iov_remove_virtfn(dev, i);\n+\tif (!nested)\n+\t\tpci_unlock_rescan_remove();\n \n \treturn rc;\n }\n@@ -764,10 +770,14 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)\n static void sriov_del_vfs(struct pci_dev *dev)\n {\n \tstruct pci_sriov *iov = dev->sriov;\n+\tbool nested;\n \tint i;\n \n+\tnested = !pci_lock_rescan_remove_nested();\n \tfor (i = 0; i < iov->num_VFs; i++)\n \t\tpci_iov_remove_virtfn(dev, i);\n+\tif (!nested)\n+\t\tpci_unlock_rescan_remove();\n }\n \n static void sriov_disable(struct pci_dev *dev)\ndiff --git a/drivers/pci/pci.h b/drivers/pci/pci.h\nindex c8a0522e2e1f..7d3b705728fd 100644\n--- a/drivers/pci/pci.h\n+++ b/drivers/pci/pci.h\n@@ -367,6 +367,7 @@ static inline void pci_remove_legacy_files(struct pci_bus *bus) { }\n /* Lock for read/write access to pci device and bus lists */\n extern struct rw_semaphore pci_bus_sem;\n extern struct mutex pci_slot_mutex;\n+bool pci_lock_rescan_remove_nested(void);\n \n extern raw_spinlock_t pci_lock;\n \ndiff --git a/drivers/pci/probe.c b/drivers/pci/probe.c\nindex 7711f579fa1d..5f38ed0c641a 100644\n--- a/drivers/pci/probe.c\n+++ b/drivers/pci/probe.c\n@@ -3478,19 +3478,31 @@ 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 \n void pci_lock_rescan_remove(void)\n {\n \tmutex_lock(&pci_rescan_remove_lock);\n+\tpci_rescan_remove_owner = current;\n }\n EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);\n \n void pci_unlock_rescan_remove(void)\n {\n+\tpci_rescan_remove_owner = NULL;\n \tmutex_unlock(&pci_rescan_remove_lock);\n }\n EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);\n \n+bool pci_lock_rescan_remove_nested(void)\n+{\n+\tif (pci_rescan_remove_owner == current)\n+\t\treturn false;\n+\tpci_lock_rescan_remove();\n+\treturn true;\n+}\n+EXPORT_SYMBOL_GPL(pci_lock_rescan_remove_nested);\n+\n static int __init pci_sort_bf_cmp(const struct device *d_a,\n \t\t\t\t const struct device *d_b)\n {\n", "prefixes": [ "v1", "1/1" ] }