LXR linux/drivers/pci/remove.c

   1#include <linux/pci.h>
   2#include <linux/module.h>
   3#include <linux/pci-aspm.h>
   4#include "pci.h"
   5
   6static void pci_free_resources(struct pci_dev *dev)
   7{
   8        int i;
   9
  10        msi_remove_pci_irq_vectors(dev);
  11
  12        pci_cleanup_rom(dev);
  13        for (i = 0; i < PCI_NUM_RESOURCES; i++) {
  14                struct resource *res = dev->resource + i;
  15                if (res->parent)
  16                        release_resource(res);
  17        }
  18}
  19
  20static void pci_stop_dev(struct pci_dev *dev)
  21{
  22        if (dev->is_added) {
  23                pci_proc_detach_device(dev);
  24                pci_remove_sysfs_dev_files(dev);
  25                device_unregister(&dev->dev);
  26                dev->is_added = 0;
  27        }
  28
  29        if (dev->bus->self)
  30                pcie_aspm_exit_link_state(dev);
  31}
  32
  33static void pci_destroy_dev(struct pci_dev *dev)
  34{
  35        pci_stop_dev(dev);
  36
  37        /* Remove the device from the device lists, and prevent any further
  38         * list accesses from this device */
  39        down_write(&pci_bus_sem);
  40        list_del(&dev->bus_list);
  41        dev->bus_list.next = dev->bus_list.prev = NULL;
  42        up_write(&pci_bus_sem);
  43
  44        pci_free_resources(dev);
  45        pci_dev_put(dev);
  46}
  47
  48/**
  49 * pci_remove_device_safe - remove an unused hotplug device
  50 * @dev: the device to remove
  51 *
  52 * Delete the device structure from the device lists and 
  53 * notify userspace (/sbin/hotplug), but only if the device
  54 * in question is not being used by a driver.
  55 * Returns 0 on success.
  56 */
  57#if 0
  58int pci_remove_device_safe(struct pci_dev *dev)
  59{
  60        if (pci_dev_driver(dev))
  61                return -EBUSY;
  62        pci_destroy_dev(dev);
  63        return 0;
  64}
  65#endif  /*  0  */
  66
  67void pci_remove_bus(struct pci_bus *pci_bus)
  68{
  69        pci_proc_detach_bus(pci_bus);
  70
  71        down_write(&pci_bus_sem);
  72        list_del(&pci_bus->node);
  73        up_write(&pci_bus_sem);
  74        if (!pci_bus->is_added)
  75                return;
  76
  77        pci_remove_legacy_files(pci_bus);
  78        device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
  79        device_remove_file(&pci_bus->dev, &dev_attr_cpulistaffinity);
  80        device_unregister(&pci_bus->dev);
  81}
  82EXPORT_SYMBOL(pci_remove_bus);
  83
  84/**
  85 * pci_remove_bus_device - remove a PCI device and any children
  86 * @dev: the device to remove
  87 *
  88 * Remove a PCI device from the device lists, informing the drivers
  89 * that the device has been removed.  We also remove any subordinate
  90 * buses and children in a depth-first manner.
  91 *
  92 * For each device we remove, delete the device structure from the
  93 * device lists, remove the /proc entry, and notify userspace
  94 * (/sbin/hotplug).
  95 */
  96void pci_remove_bus_device(struct pci_dev *dev)
  97{
  98        pci_stop_bus_device(dev);
  99        if (dev->subordinate) {
 100                struct pci_bus *b = dev->subordinate;
 101
 102                pci_remove_behind_bridge(dev);
 103                pci_remove_bus(b);
 104                dev->subordinate = NULL;
 105        }
 106
 107        pci_destroy_dev(dev);
 108}
 109
 110/**
 111 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 112 * @dev: PCI bridge device
 113 *
 114 * Remove all devices on the bus, except for the parent bridge.
 115 * This also removes any child buses, and any devices they may
 116 * contain in a depth-first manner.
 117 */
 118void pci_remove_behind_bridge(struct pci_dev *dev)
 119{
 120        struct list_head *l, *n;
 121
 122        if (dev->subordinate)
 123                list_for_each_safe(l, n, &dev->subordinate->devices)
 124                        pci_remove_bus_device(pci_dev_b(l));
 125}
 126
 127static void pci_stop_bus_devices(struct pci_bus *bus)
 128{
 129        struct list_head *l, *n;
 130
 131        list_for_each_safe(l, n, &bus->devices) {
 132                struct pci_dev *dev = pci_dev_b(l);
 133                pci_stop_bus_device(dev);
 134        }
 135}
 136
 137/**
 138 * pci_stop_bus_device - stop a PCI device and any children
 139 * @dev: the device to stop
 140 *
 141 * Stop a PCI device (detach the driver, remove from the global list
 142 * and so on). This also stop any subordinate buses and children in a
 143 * depth-first manner.
 144 */
 145void pci_stop_bus_device(struct pci_dev *dev)
 146{
 147        if (dev->subordinate)
 148                pci_stop_bus_devices(dev->subordinate);
 149
 150        pci_stop_dev(dev);
 151}
 152
 153EXPORT_SYMBOL(pci_remove_bus_device);
 154EXPORT_SYMBOL(pci_remove_behind_bridge);
 155EXPORT_SYMBOL_GPL(pci_stop_bus_device);
 156