workqueue: skip the node_nr_active update for non-unbound workqueuesgrafted

apply_wqattrs_commit() updates node_nr_active->max unconditionally.
wq->node_nr_active[] is only allocated for unbound workqueues, so guard
the call before per-cpu workqueues start using this path.

No functional change: only unbound workqueues reach apply_wqattrs_*()
today.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 189 insertions, 0 deletions

diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
new file mode 100644
index 000000000..e9d519993
--- /dev/null
+++ b/drivers/pci/remove.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include "pci.h"
+
+static void pci_free_resources(struct pci_dev *dev)
+{
+	struct resource *res;
+
+	pci_dev_for_each_resource(dev, res) {
+		if (res->parent)
+			release_resource(res);
+	}
+}
+
+static void pci_stop_dev(struct pci_dev *dev)
+{
+	pci_pme_active(dev, false);
+
+	if (!pci_dev_test_and_clear_added(dev))
+		return;
+
+	device_release_driver(&dev->dev);
+	pci_proc_detach_device(dev);
+	pci_remove_sysfs_dev_files(dev);
+	of_pci_remove_node(dev);
+}
+
+static void pci_destroy_dev(struct pci_dev *dev)
+{
+	if (pci_dev_test_and_set_removed(dev))
+		return;
+
+	pci_doe_sysfs_teardown(dev);
+	pci_npem_remove(dev);
+
+	/*
+	 * While device is in D0 drop the device from TSM link operations
+	 * including unbind and disconnect (IDE + SPDM teardown).
+	 */
+	pci_tsm_destroy(dev);
+
+	device_del(&dev->dev);
+
+	down_write(&pci_bus_sem);
+	list_del(&dev->bus_list);
+	up_write(&pci_bus_sem);
+
+	pci_doe_destroy(dev);
+	pci_ide_destroy(dev);
+	pcie_aspm_exit_link_state(dev);
+	pci_bridge_d3_update(dev);
+	pci_free_resources(dev);
+	put_device(&dev->dev);
+}
+
+void pci_remove_bus(struct pci_bus *bus)
+{
+	pci_proc_detach_bus(bus);
+
+	down_write(&pci_bus_sem);
+	list_del(&bus->node);
+	pci_bus_release_busn_res(bus);
+	up_write(&pci_bus_sem);
+	pci_remove_legacy_files(bus);
+
+	if (bus->ops->remove_bus)
+		bus->ops->remove_bus(bus);
+
+	pcibios_remove_bus(bus);
+	device_unregister(&bus->dev);
+}
+EXPORT_SYMBOL(pci_remove_bus);
+
+static void pci_stop_bus_device(struct pci_dev *dev)
+{
+	struct pci_bus *bus = dev->subordinate;
+	struct pci_dev *child, *tmp;
+
+	/*
+	 * Stopping an SR-IOV PF device removes all the associated VFs,
+	 * which will update the bus->devices list and confuse the
+	 * iterator.  Therefore, iterate in reverse so we remove the VFs
+	 * first, then the PF.
+	 */
+	if (bus) {
+		list_for_each_entry_safe_reverse(child, tmp,
+						 &bus->devices, bus_list)
+			pci_stop_bus_device(child);
+	}
+
+	pci_stop_dev(dev);
+}
+
+static void pci_remove_bus_device(struct pci_dev *dev)
+{
+	struct pci_bus *bus = dev->subordinate;
+	struct pci_dev *child, *tmp;
+
+	if (bus) {
+		list_for_each_entry_safe(child, tmp,
+					 &bus->devices, bus_list)
+			pci_remove_bus_device(child);
+
+		pci_remove_bus(bus);
+		dev->subordinate = NULL;
+	}
+
+	pci_destroy_dev(dev);
+}
+
+/**
+ * pci_stop_and_remove_bus_device - remove a PCI device and any children
+ * @dev: the device to remove
+ *
+ * Remove a PCI device from the device lists, informing the drivers
+ * that the device has been removed.  We also remove any subordinate
+ * buses and children in a depth-first manner.
+ *
+ * For each device we remove, delete the device structure from the
+ * device lists, remove the /proc entry, and notify userspace
+ * (/sbin/hotplug).
+ */
+void pci_stop_and_remove_bus_device(struct pci_dev *dev)
+{
+	lockdep_assert_held(&pci_rescan_remove_lock);
+	pci_stop_bus_device(dev);
+	pci_remove_bus_device(dev);
+}
+EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
+
+void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
+{
+	pci_lock_rescan_remove();
+	pci_stop_and_remove_bus_device(dev);
+	pci_unlock_rescan_remove();
+}
+EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
+
+void pci_stop_root_bus(struct pci_bus *bus)
+{
+	struct pci_dev *child, *tmp;
+	struct pci_host_bridge *host_bridge;
+
+	if (!pci_is_root_bus(bus))
+		return;
+
+	host_bridge = to_pci_host_bridge(bus->bridge);
+	list_for_each_entry_safe_reverse(child, tmp,
+					 &bus->devices, bus_list)
+		pci_stop_bus_device(child);
+
+	of_pci_remove_host_bridge_node(host_bridge);
+
+	/* stop the host bridge */
+	device_release_driver(&host_bridge->dev);
+}
+EXPORT_SYMBOL_GPL(pci_stop_root_bus);
+
+void pci_remove_root_bus(struct pci_bus *bus)
+{
+	struct pci_dev *child, *tmp;
+	struct pci_host_bridge *host_bridge;
+
+	if (!pci_is_root_bus(bus))
+		return;
+
+	host_bridge = to_pci_host_bridge(bus->bridge);
+	list_for_each_entry_safe(child, tmp,
+				 &bus->devices, bus_list)
+		pci_remove_bus_device(child);
+
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+	/* Release domain_nr if it was dynamically allocated */
+	if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
+		pci_bus_release_domain_nr(host_bridge->dev.parent, bus->domain_nr);
+#endif
+
+	pci_remove_bus(bus);
+	host_bridge->bus = NULL;
+
+	/* remove the host bridge */
+	device_del(&host_bridge->dev);
+}
+EXPORT_SYMBOL_GPL(pci_remove_root_bus);