drivers/pci/remove.c

   1 #include <linux/pci.h>
   2 #include <linux/module.h>
   3 #include "pci.h"
   4
   5 #undef DEBUG
   6
   7 #ifdef DEBUG
   8 #define DBG(x...) printk(x)
   9 #else
  10 #define DBG(x...)
  11 #endif
  12
  13 static void pci_free_resources(struct pci_dev *dev)
  14 {
  15         int i;
  16
  17         msi_remove_pci_irq_vectors(dev);
  18
  19         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
  20                 struct resource *res = dev->resource + i;
  21                 if (res->parent)
  22                         release_resource(res);
  23         }
  24 }
  25
  26 static void pci_destroy_dev(struct pci_dev *dev)
  27 {
  28         pci_proc_detach_device(dev);
  29         device_unregister(&dev->dev);
  30
  31         /* Remove the device from the device lists, and prevent any further
  32          * list accesses from this device */
  33         spin_lock(&pci_bus_lock);
  34         list_del(&dev->bus_list);
  35         list_del(&dev->global_list);
  36         dev->bus_list.next = dev->bus_list.prev = NULL;
  37         dev->global_list.next = dev->global_list.prev = NULL;
  38         spin_unlock(&pci_bus_lock);
  39
  40         pci_free_resources(dev);
  41         pci_dev_put(dev);
  42 }
  43
  44 /**
  45  * pci_remove_device_safe - remove an unused hotplug device
  46  * @dev: the device to remove
  47  *
  48  * Delete the device structure from the device lists and
  49  * notify userspace (/sbin/hotplug), but only if the device
  50  * in question is not being used by a driver.
  51  * Returns 0 on success.
  52  */
  53 int pci_remove_device_safe(struct pci_dev *dev)
  54 {
  55         if (pci_dev_driver(dev))
  56                 return -EBUSY;
  57         pci_destroy_dev(dev);
  58         return 0;
  59 }
  60 EXPORT_SYMBOL(pci_remove_device_safe);
  61
  62 void pci_remove_bus(struct pci_bus *b)
  63 {
  64         pci_proc_detach_bus(b);
  65
  66         spin_lock(&pci_bus_lock);
  67         list_del(&b->node);
  68         spin_unlock(&pci_bus_lock);
  69
  70         class_device_unregister(&b->class_dev);
  71 }
  72 EXPORT_SYMBOL(pci_remove_bus);
  73
  74 /**
  75  * pci_remove_bus_device - remove a PCI device and any children
  76  * @dev: the device to remove
  77  *
  78  * Remove a PCI device from the device lists, informing the drivers
  79  * that the device has been removed.  We also remove any subordinate
  80  * buses and children in a depth-first manner.
  81  *
  82  * For each device we remove, delete the device structure from the
  83  * device lists, remove the /proc entry, and notify userspace
  84  * (/sbin/hotplug).
  85  */
  86 void pci_remove_bus_device(struct pci_dev *dev)
  87 {
  88         if (dev->subordinate) {
  89                 struct pci_bus *b = dev->subordinate;
  90
  91                 pci_remove_behind_bridge(dev);
  92                 pci_remove_bus(b);
  93                 dev->subordinate = NULL;
  94         }
  95
  96         pci_destroy_dev(dev);
  97 }
  98
  99 /**
 100  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 101  * @dev: PCI bridge device
 102  *
 103  * Remove all devices on the bus, except for the parent bridge.
 104  * This also removes any child buses, and any devices they may
 105  * contain in a depth-first manner.
 106  */
 107 void pci_remove_behind_bridge(struct pci_dev *dev)
 108 {
 109         struct list_head *l, *n;
 110
 111         if (dev->subordinate) {
 112                 list_for_each_safe(l, n, &dev->subordinate->devices) {
 113                         struct pci_dev *dev = pci_dev_b(l);
 114
 115                         pci_remove_bus_device(dev);
 116                 }
 117         }
 118 }
 119
 120 EXPORT_SYMBOL(pci_remove_bus_device);
 121 EXPORT_SYMBOL(pci_remove_behind_bridge);