1#include <linux/pci.h>
2#include <linux/module.h>
3#include "pci.h"
4
5static 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
19static 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
35static 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
60void pci_remove_bus(struct pci_bus *pci_bus)
61{
62	pci_proc_detach_bus(pci_bus);
63
64	down_write(&pci_bus_sem);
65	list_del(&pci_bus->node);
66	up_write(&pci_bus_sem);
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}
73EXPORT_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 */
87void 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 */
108void 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
121static void pci_stop_bus_devices(struct pci_bus *bus)
122{
123	struct list_head *l, *n;
124
125	list_for_each_safe(l, n, &bus->devices) {
126		struct pci_dev *dev = pci_dev_b(l);
127		pci_stop_bus_device(dev);
128	}
129}
130
131/**
132 * pci_stop_bus_device - stop a PCI device and any children
133 * @dev: the device to stop
134 *
135 * Stop a PCI device (detach the driver, remove from the global list
136 * and so on). This also stop any subordinate buses and children in a
137 * depth-first manner.
138 */
139void pci_stop_bus_device(struct pci_dev *dev)
140{
141	if (dev->subordinate)
142		pci_stop_bus_devices(dev->subordinate);
143
144	pci_stop_dev(dev);
145}
146
147EXPORT_SYMBOL(pci_remove_bus_device);
148EXPORT_SYMBOL(pci_remove_behind_bridge);
149EXPORT_SYMBOL_GPL(pci_stop_bus_device);
150