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_stop_dev(struct pci_dev *dev)
  20 {
  21         if (dev->is_added) {
  22                 pci_proc_detach_device(dev);
  23                 pci_remove_sysfs_dev_files(dev);
  24                 device_unregister(&dev->dev);
  25                 dev->is_added = 0;
  26         }
  27 }
  28
  29 static void pci_destroy_dev(struct pci_dev *dev)
  30 {
  31         pci_stop_dev(dev);
  32
  33         /* Remove the device from the device lists, and prevent any further
  34          * list accesses from this device */
  35         down_write(&pci_bus_sem);
  36         list_del(&dev->bus_list);
  37         dev->bus_list.next = dev->bus_list.prev = NULL;
  38         up_write(&pci_bus_sem);
  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 #if 0
  54 int pci_remove_device_safe(struct pci_dev *dev)
  55 {
  56         if (pci_dev_driver(dev))
  57                 return -EBUSY;
  58         pci_destroy_dev(dev);
  59         return 0;
  60 }
  61 #endif  /*  0  */
  62
  63 void pci_remove_bus(struct pci_bus *pci_bus)
  64 {
  65         pci_proc_detach_bus(pci_bus);
  66
  67         down_write(&pci_bus_sem);
  68         list_del(&pci_bus->node);
  69         up_write(&pci_bus_sem);
  70         pci_remove_legacy_files(pci_bus);
  71         device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
  72         device_unregister(&pci_bus->dev);
  73 }
  74 EXPORT_SYMBOL(pci_remove_bus);
  75
  76 /**
  77  * pci_remove_bus_device - remove a PCI device and any children
  78  * @dev: the device to remove
  79  *
  80  * Remove a PCI device from the device lists, informing the drivers
  81  * that the device has been removed.  We also remove any subordinate
  82  * buses and children in a depth-first manner.
  83  *
  84  * For each device we remove, delete the device structure from the
  85  * device lists, remove the /proc entry, and notify userspace
  86  * (/sbin/hotplug).
  87  */
  88 void pci_remove_bus_device(struct pci_dev *dev)
  89 {
  90         if (dev->subordinate) {
  91                 struct pci_bus *b = dev->subordinate;
  92
  93                 pci_remove_behind_bridge(dev);
  94                 pci_remove_bus(b);
  95                 dev->subordinate = NULL;
  96         }
  97
  98         pci_destroy_dev(dev);
  99 }
 100
 101 /**
 102  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 103  * @dev: PCI bridge device
 104  *
 105  * Remove all devices on the bus, except for the parent bridge.
 106  * This also removes any child buses, and any devices they may
 107  * contain in a depth-first manner.
 108  */
 109 void pci_remove_behind_bridge(struct pci_dev *dev)
 110 {
 111         struct list_head *l, *n;
 112
 113         if (dev->subordinate) {
 114                 list_for_each_safe(l, n, &dev->subordinate->devices) {
 115                         struct pci_dev *dev = pci_dev_b(l);
 116
 117                         pci_remove_bus_device(dev);
 118                 }
 119         }
 120 }
 121
 122 static void pci_stop_bus_devices(struct pci_bus *bus)
 123 {
 124         struct list_head *l, *n;
 125
 126         list_for_each_safe(l, n, &bus->devices) {
 127                 struct pci_dev *dev = pci_dev_b(l);
 128                 pci_stop_bus_device(dev);
 129         }
 130 }
 131
 132 /**
 133  * pci_stop_bus_device - stop a PCI device and any children
 134  * @dev: the device to stop
 135  *
 136  * Stop a PCI device (detach the driver, remove from the global list
 137  * and so on). This also stop any subordinate buses and children in a
 138  * depth-first manner.
 139  */
 140 void pci_stop_bus_device(struct pci_dev *dev)
 141 {
 142         if (dev->subordinate)
 143                 pci_stop_bus_devices(dev->subordinate);
 144
 145         pci_stop_dev(dev);
 146 }
 147
 148 EXPORT_SYMBOL(pci_remove_bus_device);
 149 EXPORT_SYMBOL(pci_remove_behind_bridge);
 150 EXPORT_SYMBOL_GPL(pci_stop_bus_device);