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         if (!list_empty(&dev->global_list)) {
  22                 pci_proc_detach_device(dev);
  23                 pci_remove_sysfs_dev_files(dev);
  24                 device_unregister(&dev->dev);
  25                 spin_lock(&pci_bus_lock);
  26                 list_del(&dev->global_list);
  27                 dev->global_list.next = dev->global_list.prev = NULL;
  28                 spin_unlock(&pci_bus_lock);
  29         }
  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         dev->bus_list.next = dev->bus_list.prev = NULL;
  36         spin_unlock(&pci_bus_lock);
  37
  38         pci_free_resources(dev);
  39         pci_dev_put(dev);
  40 }
  41
  42 /**
  43  * pci_remove_device_safe - remove an unused hotplug device
  44  * @dev: the device to remove
  45  *
  46  * Delete the device structure from the device lists and
  47  * notify userspace (/sbin/hotplug), but only if the device
  48  * in question is not being used by a driver.
  49  * Returns 0 on success.
  50  */
  51 int pci_remove_device_safe(struct pci_dev *dev)
  52 {
  53         if (pci_dev_driver(dev))
  54                 return -EBUSY;
  55         pci_destroy_dev(dev);
  56         return 0;
  57 }
  58 EXPORT_SYMBOL(pci_remove_device_safe);
  59
  60 void pci_remove_bus(struct pci_bus *pci_bus)
  61 {
  62         pci_proc_detach_bus(pci_bus);
  63
  64         spin_lock(&pci_bus_lock);
  65         list_del(&pci_bus->node);
  66         spin_unlock(&pci_bus_lock);
  67         pci_remove_legacy_files(pci_bus);
  68         class_device_remove_file(&pci_bus->class_dev,
  69                 &class_device_attr_cpuaffinity);
  70         sysfs_remove_link(&pci_bus->class_dev.kobj, "bridge");
  71         class_device_unregister(&pci_bus->class_dev);
  72 }
  73 EXPORT_SYMBOL(pci_remove_bus);
  74
  75 /**
  76  * pci_remove_bus_device - remove a PCI device and any children
  77  * @dev: the device to remove
  78  *
  79  * Remove a PCI device from the device lists, informing the drivers
  80  * that the device has been removed.  We also remove any subordinate
  81  * buses and children in a depth-first manner.
  82  *
  83  * For each device we remove, delete the device structure from the
  84  * device lists, remove the /proc entry, and notify userspace
  85  * (/sbin/hotplug).
  86  */
  87 void pci_remove_bus_device(struct pci_dev *dev)
  88 {
  89         if (dev->subordinate) {
  90                 struct pci_bus *b = dev->subordinate;
  91
  92                 pci_remove_behind_bridge(dev);
  93                 pci_remove_bus(b);
  94                 dev->subordinate = NULL;
  95         }
  96
  97         pci_destroy_dev(dev);
  98 }
  99
 100 /**
 101  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 102  * @dev: PCI bridge device
 103  *
 104  * Remove all devices on the bus, except for the parent bridge.
 105  * This also removes any child buses, and any devices they may
 106  * contain in a depth-first manner.
 107  */
 108 void pci_remove_behind_bridge(struct pci_dev *dev)
 109 {
 110         struct list_head *l, *n;
 111
 112         if (dev->subordinate) {
 113                 list_for_each_safe(l, n, &dev->subordinate->devices) {
 114                         struct pci_dev *dev = pci_dev_b(l);
 115
 116                         pci_remove_bus_device(dev);
 117                 }
 118         }
 119 }
 120
 121 EXPORT_SYMBOL(pci_remove_bus_device);
 122 EXPORT_SYMBOL(pci_remove_behind_bridge);