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->global_list.next)
  22                 return;
  23
  24         if (!list_empty(&dev->global_list)) {
  25                 pci_proc_detach_device(dev);
  26                 pci_remove_sysfs_dev_files(dev);
  27                 device_unregister(&dev->dev);
  28                 down_write(&pci_bus_sem);
  29                 list_del(&dev->global_list);
  30                 dev->global_list.next = dev->global_list.prev = NULL;
  31                 up_write(&pci_bus_sem);
  32         }
  33 }
  34
  35 static void pci_destroy_dev(struct pci_dev *dev)
  36 {
  37         pci_stop_dev(dev);
  38
  39         /* Remove the device from the device lists, and prevent any further
  40          * list accesses from this device */
  41         down_write(&pci_bus_sem);
  42         list_del(&dev->bus_list);
  43         dev->bus_list.next = dev->bus_list.prev = NULL;
  44         up_write(&pci_bus_sem);
  45
  46         pci_free_resources(dev);
  47         pci_dev_put(dev);
  48 }
  49
  50 /**
  51  * pci_remove_device_safe - remove an unused hotplug device
  52  * @dev: the device to remove
  53  *
  54  * Delete the device structure from the device lists and
  55  * notify userspace (/sbin/hotplug), but only if the device
  56  * in question is not being used by a driver.
  57  * Returns 0 on success.
  58  */
  59 #if 0
  60 int pci_remove_device_safe(struct pci_dev *dev)
  61 {
  62         if (pci_dev_driver(dev))
  63                 return -EBUSY;
  64         pci_destroy_dev(dev);
  65         return 0;
  66 }
  67 #endif  /*  0  */
  68
  69 void pci_remove_bus(struct pci_bus *pci_bus)
  70 {
  71         pci_proc_detach_bus(pci_bus);
  72
  73         down_write(&pci_bus_sem);
  74         list_del(&pci_bus->node);
  75         up_write(&pci_bus_sem);
  76         pci_remove_legacy_files(pci_bus);
  77         device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
  78         device_unregister(&pci_bus->dev);
  79 }
  80 EXPORT_SYMBOL(pci_remove_bus);
  81
  82 /**
  83  * pci_remove_bus_device - remove a PCI device and any children
  84  * @dev: the device to remove
  85  *
  86  * Remove a PCI device from the device lists, informing the drivers
  87  * that the device has been removed.  We also remove any subordinate
  88  * buses and children in a depth-first manner.
  89  *
  90  * For each device we remove, delete the device structure from the
  91  * device lists, remove the /proc entry, and notify userspace
  92  * (/sbin/hotplug).
  93  */
  94 void pci_remove_bus_device(struct pci_dev *dev)
  95 {
  96         if (dev->subordinate) {
  97                 struct pci_bus *b = dev->subordinate;
  98
  99                 pci_remove_behind_bridge(dev);
 100                 pci_remove_bus(b);
 101                 dev->subordinate = NULL;
 102         }
 103
 104         pci_destroy_dev(dev);
 105 }
 106
 107 /**
 108  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 109  * @dev: PCI bridge device
 110  *
 111  * Remove all devices on the bus, except for the parent bridge.
 112  * This also removes any child buses, and any devices they may
 113  * contain in a depth-first manner.
 114  */
 115 void pci_remove_behind_bridge(struct pci_dev *dev)
 116 {
 117         struct list_head *l, *n;
 118
 119         if (dev->subordinate) {
 120                 list_for_each_safe(l, n, &dev->subordinate->devices) {
 121                         struct pci_dev *dev = pci_dev_b(l);
 122
 123                         pci_remove_bus_device(dev);
 124                 }
 125         }
 126 }
 127
 128 static void pci_stop_bus_devices(struct pci_bus *bus)
 129 {
 130         struct list_head *l, *n;
 131
 132         list_for_each_safe(l, n, &bus->devices) {
 133                 struct pci_dev *dev = pci_dev_b(l);
 134                 pci_stop_bus_device(dev);
 135         }
 136 }
 137
 138 /**
 139  * pci_stop_bus_device - stop a PCI device and any children
 140  * @dev: the device to stop
 141  *
 142  * Stop a PCI device (detach the driver, remove from the global list
 143  * and so on). This also stop any subordinate buses and children in a
 144  * depth-first manner.
 145  */
 146 void pci_stop_bus_device(struct pci_dev *dev)
 147 {
 148         if (dev->subordinate)
 149                 pci_stop_bus_devices(dev->subordinate);
 150
 151         pci_stop_dev(dev);
 152 }
 153
 154 EXPORT_SYMBOL(pci_remove_bus_device);
 155 EXPORT_SYMBOL(pci_remove_behind_bridge);
 156 EXPORT_SYMBOL_GPL(pci_stop_bus_device);