the task (Benjamin Block)
 - Added Reviewed-by and Tested-by from Benjamin Block (IBM)

Changes in v3:
 - Rebased on linux-next (next-20260225)
 - Added Tested-by from Dragos Tatulea (NVIDIA)
 - No code changes from v2

Changes in v2:
 - Renamed from pci_lock_rescan_remove_nested() to
   pci_lock_rescan_remove_reentrant() to avoid confusion with
   mutex_lock_nested() lockdep annotations (Benjamin Block)
 - Added pci_unlock_rescan_remove_reentrant(const bool locked) helper
   to avoid open-coding conditional unlock at each call site
   (Benjamin Block)
 - Moved declarations from drivers/pci/pci.h to include/linux/pci.h
   alongside existing lock/unlock declarations (Benjamin Block)
 - Simplified callers: removed negation of return value and manual
   conditional unlock in favor of the paired lock/unlock helpers

 drivers/pci/iov.c   |  7 +++++++
 drivers/pci/probe.c | 19 +++++++++++++++++++
 include/linux/pci.h |  2 ++
 3 files changed, 28 insertions(+)

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 91ac4e37ecb9c..adbe4ecc587c9 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -629,19 +629,23 @@ static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)
 {
 	unsigned int i;
 	int rc;
+	bool locked;
 
 	if (dev->no_vf_scan)
 		return 0;
 
+	locked = pci_lock_rescan_remove_reentrant();
 	for (i = 0; i < num_vfs; i++) {
 		rc = pci_iov_add_virtfn(dev, i);
 		if (rc)
 			goto failed;
 	}
+	pci_unlock_rescan_remove_reentrant(locked);
 	return 0;
 failed:
 	while (i--)
 		pci_iov_remove_virtfn(dev, i);
+	pci_unlock_rescan_remove_reentrant(locked);
 
 	return rc;
 }
@@ -764,10 +768,13 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 static void sriov_del_vfs(struct pci_dev *dev)
 {
 	struct pci_sriov *iov = dev->sriov;
+	bool locked;
 	int i;
 
+	locked = pci_lock_rescan_remove_reentrant();
 	for (i = 0; i < iov->num_VFs; i++)
 		pci_iov_remove_virtfn(dev, i);
+	pci_unlock_rescan_remove_reentrant(locked);
 }
 
 static void sriov_disable(struct pci_dev *dev)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index bccc7a4bdd794..c7f672eac0698 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3509,19 +3509,38 @@ EXPORT_SYMBOL_GPL(pci_rescan_bus);
  * routines should always be executed under this mutex.
  */
 DEFINE_MUTEX(pci_rescan_remove_lock);
+static const struct task_struct *pci_rescan_remove_owner;
 
 void pci_lock_rescan_remove(void)
 {
 	mutex_lock(&pci_rescan_remove_lock);
+	pci_rescan_remove_owner = current;
 }
 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);
 
 void pci_unlock_rescan_remove(void)
 {
+	pci_rescan_remove_owner = NULL;
 	mutex_unlock(&pci_rescan_remove_lock);
 }
 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);
 
+bool pci_lock_rescan_remove_reentrant(void)
+{
+	if (pci_rescan_remove_owner == current)
+		return false;
+	pci_lock_rescan_remove();
+	return true;
+}
+EXPORT_SYMBOL_GPL(pci_lock_rescan_remove_reentrant);
+
+void pci_unlock_rescan_remove_reentrant(const bool locked)
+{
+	if (locked)
+		pci_unlock_rescan_remove();
+}
+EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove_reentrant);
+
 static int __init pci_sort_bf_cmp(const struct device *d_a,
 				  const struct device *d_b)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1c270f1d51230..080950f0bab33 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1535,6 +1535,8 @@ void set_pcie_hotplug_bridge(struct pci_dev *pdev);
 unsigned int pci_rescan_bus(struct pci_bus *bus);
 void pci_lock_rescan_remove(void);
 void pci_unlock_rescan_remove(void);
+bool pci_lock_rescan_remove_reentrant(void);
+void pci_unlock_rescan_remove_reentrant(const bool locked);
 
 /* Vital Product Data routines */
 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
-- 
2.53.0[PATCH v4 1/1] PCI/IOV: Add reentrant locking in sriov_add_vfs/sriov_del_vfs for complete serialization"Ionut Nechita (Wind River)" <ionut.nechita@windriver.com> undefinedbhelgaas@google.com undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined