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
   6 static void pci_stop_dev(struct pci_dev *dev)
   7 {
   8         pci_pme_active(dev, false);
   9
  10         if (dev->is_added) {
  11                 pci_proc_detach_device(dev);
  12                 pci_remove_sysfs_dev_files(dev);
  13                 device_release_driver(&dev->dev);
  14                 dev->is_added = 0;
  15         }
  16
  17         if (dev->bus->self)
  18                 pcie_aspm_exit_link_state(dev);
  19 }
  20
  21 static void pci_destroy_dev(struct pci_dev *dev)
  22 {
  23         if (!dev->dev.kobj.parent)
  24                 return;
  25
  26         device_del(&dev->dev);
  27
  28         put_device(&dev->dev);
  29 }
  30
  31 void pci_remove_bus(struct pci_bus *bus)
  32 {
  33         pci_proc_detach_bus(bus);
  34
  35         down_write(&pci_bus_sem);
  36         list_del(&bus->node);
  37         pci_bus_release_busn_res(bus);
  38         up_write(&pci_bus_sem);
  39         pci_remove_legacy_files(bus);
  40         pcibios_remove_bus(bus);
  41         device_unregister(&bus->dev);
  42 }
  43 EXPORT_SYMBOL(pci_remove_bus);
  44
  45 static void pci_stop_bus_device(struct pci_dev *dev)
  46 {
  47         struct pci_bus *bus = dev->subordinate;
  48         struct pci_dev *child, *tmp;
  49
  50         /*
  51          * Stopping an SR-IOV PF device removes all the associated VFs,
  52          * which will update the bus->devices list and confuse the
  53          * iterator.  Therefore, iterate in reverse so we remove the VFs
  54          * first, then the PF.
  55          */
  56         if (bus) {
  57                 list_for_each_entry_safe_reverse(child, tmp,
  58                                                  &bus->devices, bus_list)
  59                         pci_stop_bus_device(child);
  60         }
  61
  62         pci_stop_dev(dev);
  63 }
  64
  65 static void pci_remove_bus_device(struct pci_dev *dev)
  66 {
  67         struct pci_bus *bus = dev->subordinate;
  68         struct pci_dev *child, *tmp;
  69
  70         if (bus) {
  71                 list_for_each_entry_safe(child, tmp,
  72                                          &bus->devices, bus_list)
  73                         pci_remove_bus_device(child);
  74
  75                 pci_remove_bus(bus);
  76                 dev->subordinate = NULL;
  77         }
  78
  79         pci_destroy_dev(dev);
  80 }
  81
  82 /**
  83  * pci_stop_and_remove_bus_device - remove a PCI device and any children
  84  * @dev: the device to remove
  85  *
  86  * Remove a PCI device from the device lists, informing the drivers
  87  * that the device has been removed.  We also remove any subordinate
  88  * buses and children in a depth-first manner.
  89  *
  90  * For each device we remove, delete the device structure from the
  91  * device lists, remove the /proc entry, and notify userspace
  92  * (/sbin/hotplug).
  93  */
  94 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
  95 {
  96         pci_stop_bus_device(dev);
  97         pci_remove_bus_device(dev);
  98 }
  99 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 100
 101 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
 102 {
 103         pci_lock_rescan_remove();
 104         pci_stop_and_remove_bus_device(dev);
 105         pci_unlock_rescan_remove();
 106 }
 107 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
 108
 109 void pci_stop_root_bus(struct pci_bus *bus)
 110 {
 111         struct pci_dev *child, *tmp;
 112         struct pci_host_bridge *host_bridge;
 113
 114         if (!pci_is_root_bus(bus))
 115                 return;
 116
 117         host_bridge = to_pci_host_bridge(bus->bridge);
 118         list_for_each_entry_safe_reverse(child, tmp,
 119                                          &bus->devices, bus_list)
 120                 pci_stop_bus_device(child);
 121
 122         /* stop the host bridge */
 123         device_release_driver(&host_bridge->dev);
 124 }
 125
 126 void pci_remove_root_bus(struct pci_bus *bus)
 127 {
 128         struct pci_dev *child, *tmp;
 129         struct pci_host_bridge *host_bridge;
 130
 131         if (!pci_is_root_bus(bus))
 132                 return;
 133
 134         host_bridge = to_pci_host_bridge(bus->bridge);
 135         list_for_each_entry_safe(child, tmp,
 136                                  &bus->devices, bus_list)
 137                 pci_remove_bus_device(child);
 138         pci_remove_bus(bus);
 139         host_bridge->bus = NULL;
 140
 141         /* remove the host bridge */
 142         device_unregister(&host_bridge->dev);
 143 }