091ca9f063
When a root bridge hierarchy is hot-plugged, resource requirements for the new devices may be greater than what the root bridge is decoding. In this case, we want to remove devices that did not get needed resources. These devices have been scanned into bus specific lists but not yet added to the global device list. Make sure the pci remove functions can handle this case. Signed-off-by: Rajesh Shah <rajesh.shah@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
123 lines
3 KiB
C
123 lines
3 KiB
C
#include <linux/pci.h>
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#include <linux/module.h>
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#include "pci.h"
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static void pci_free_resources(struct pci_dev *dev)
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{
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int i;
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msi_remove_pci_irq_vectors(dev);
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pci_cleanup_rom(dev);
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *res = dev->resource + i;
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if (res->parent)
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release_resource(res);
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}
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}
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static void pci_destroy_dev(struct pci_dev *dev)
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{
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if (!list_empty(&dev->global_list)) {
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pci_proc_detach_device(dev);
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pci_remove_sysfs_dev_files(dev);
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device_unregister(&dev->dev);
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spin_lock(&pci_bus_lock);
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list_del(&dev->global_list);
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dev->global_list.next = dev->global_list.prev = NULL;
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spin_unlock(&pci_bus_lock);
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}
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/* Remove the device from the device lists, and prevent any further
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* list accesses from this device */
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spin_lock(&pci_bus_lock);
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list_del(&dev->bus_list);
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dev->bus_list.next = dev->bus_list.prev = NULL;
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spin_unlock(&pci_bus_lock);
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pci_free_resources(dev);
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pci_dev_put(dev);
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}
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/**
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* pci_remove_device_safe - remove an unused hotplug device
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* @dev: the device to remove
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*
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* Delete the device structure from the device lists and
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* notify userspace (/sbin/hotplug), but only if the device
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* in question is not being used by a driver.
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* Returns 0 on success.
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*/
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int pci_remove_device_safe(struct pci_dev *dev)
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{
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if (pci_dev_driver(dev))
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return -EBUSY;
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pci_destroy_dev(dev);
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return 0;
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}
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EXPORT_SYMBOL(pci_remove_device_safe);
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void pci_remove_bus(struct pci_bus *pci_bus)
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{
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pci_proc_detach_bus(pci_bus);
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spin_lock(&pci_bus_lock);
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list_del(&pci_bus->node);
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spin_unlock(&pci_bus_lock);
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pci_remove_legacy_files(pci_bus);
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class_device_remove_file(&pci_bus->class_dev,
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&class_device_attr_cpuaffinity);
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sysfs_remove_link(&pci_bus->class_dev.kobj, "bridge");
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class_device_unregister(&pci_bus->class_dev);
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}
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EXPORT_SYMBOL(pci_remove_bus);
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/**
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* pci_remove_bus_device - remove a PCI device and any children
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* @dev: the device to remove
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*
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* Remove a PCI device from the device lists, informing the drivers
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* that the device has been removed. We also remove any subordinate
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* buses and children in a depth-first manner.
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*
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* For each device we remove, delete the device structure from the
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* device lists, remove the /proc entry, and notify userspace
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* (/sbin/hotplug).
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*/
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void pci_remove_bus_device(struct pci_dev *dev)
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{
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if (dev->subordinate) {
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struct pci_bus *b = dev->subordinate;
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pci_remove_behind_bridge(dev);
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pci_remove_bus(b);
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dev->subordinate = NULL;
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}
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pci_destroy_dev(dev);
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}
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/**
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* pci_remove_behind_bridge - remove all devices behind a PCI bridge
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* @dev: PCI bridge device
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*
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* Remove all devices on the bus, except for the parent bridge.
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* This also removes any child buses, and any devices they may
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* contain in a depth-first manner.
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*/
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void pci_remove_behind_bridge(struct pci_dev *dev)
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{
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struct list_head *l, *n;
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if (dev->subordinate) {
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list_for_each_safe(l, n, &dev->subordinate->devices) {
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struct pci_dev *dev = pci_dev_b(l);
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pci_remove_bus_device(dev);
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}
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}
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}
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EXPORT_SYMBOL(pci_remove_bus_device);
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EXPORT_SYMBOL(pci_remove_behind_bridge);
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