drivers/pci/remove.c

   1 #include <linux/pci.h>
   2 #include <linux/module.h>
   3 #include "pci.h"
   4
   5 static void pci_free_resources(struct pci_dev *dev)
   6 {
   7         int i;
   8
   9         msi_remove_pci_irq_vectors(dev);
  10
  11         pci_cleanup_rom(dev);
  12         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
  13                 struct resource *res = dev->resource + i;
  14                 if (res->parent)
  15                         release_resource(res);
  16         }
  17 }
  18
  19 static void pci_destroy_dev(struct pci_dev *dev)
  20 {
  21         pci_proc_detach_device(dev);
  22         pci_remove_sysfs_dev_files(dev);
  23         device_unregister(&dev->dev);
  24
  25         /* Remove the device from the device lists, and prevent any further
  26          * list accesses from this device */
  27         spin_lock(&pci_bus_lock);
  28         list_del(&dev->bus_list);
  29         list_del(&dev->global_list);
  30         dev->bus_list.next = dev->bus_list.prev = NULL;
  31         dev->global_list.next = dev->global_list.prev = NULL;
  32         spin_unlock(&pci_bus_lock);
  33
  34         pci_free_resources(dev);
  35         pci_dev_put(dev);
  36 }
  37
  38 /**
  39  * pci_remove_device_safe - remove an unused hotplug device
  40  * @dev: the device to remove
  41  *
  42  * Delete the device structure from the device lists and
  43  * notify userspace (/sbin/hotplug), but only if the device
  44  * in question is not being used by a driver.
  45  * Returns 0 on success.
  46  */
  47 int pci_remove_device_safe(struct pci_dev *dev)
  48 {
  49         if (pci_dev_driver(dev))
  50                 return -EBUSY;
  51         pci_destroy_dev(dev);
  52         return 0;
  53 }
  54 EXPORT_SYMBOL(pci_remove_device_safe);
  55
  56 void pci_remove_bus(struct pci_bus *pci_bus)
  57 {
  58         pci_proc_detach_bus(pci_bus);
  59
  60         spin_lock(&pci_bus_lock);
  61         list_del(&pci_bus->node);
  62         spin_unlock(&pci_bus_lock);
  63         pci_remove_legacy_files(pci_bus);
  64         class_device_remove_file(&pci_bus->class_dev,
  65                 &class_device_attr_cpuaffinity);
  66         sysfs_remove_link(&pci_bus->class_dev.kobj, "bridge");
  67         class_device_unregister(&pci_bus->class_dev);
  68 }
  69 EXPORT_SYMBOL(pci_remove_bus);
  70
  71 /**
  72  * pci_remove_bus_device - remove a PCI device and any children
  73  * @dev: the device to remove
  74  *
  75  * Remove a PCI device from the device lists, informing the drivers
  76  * that the device has been removed.  We also remove any subordinate
  77  * buses and children in a depth-first manner.
  78  *
  79  * For each device we remove, delete the device structure from the
  80  * device lists, remove the /proc entry, and notify userspace
  81  * (/sbin/hotplug).
  82  */
  83 void pci_remove_bus_device(struct pci_dev *dev)
  84 {
  85         if (dev->subordinate) {
  86                 struct pci_bus *b = dev->subordinate;
  87
  88                 pci_remove_behind_bridge(dev);
  89                 pci_remove_bus(b);
  90                 dev->subordinate = NULL;
  91         }
  92
  93         pci_destroy_dev(dev);
  94 }
  95
  96 /**
  97  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
  98  * @dev: PCI bridge device
  99  *
 100  * Remove all devices on the bus, except for the parent bridge.
 101  * This also removes any child buses, and any devices they may
 102  * contain in a depth-first manner.
 103  */
 104 void pci_remove_behind_bridge(struct pci_dev *dev)
 105 {
 106         struct list_head *l, *n;
 107
 108         if (dev->subordinate) {
 109                 list_for_each_safe(l, n, &dev->subordinate->devices) {
 110                         struct pci_dev *dev = pci_dev_b(l);
 111
 112                         pci_remove_bus_device(dev);
 113                 }
 114         }
 115 }
 116
 117 EXPORT_SYMBOL(pci_remove_bus_device);
 118 EXPORT_SYMBOL(pci_remove_behind_bridge);