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