[thirdparty/kernel/stable.git] / drivers / pci / hotplug / fakephp.c

/*
 * Fake PCI Hot Plug Controller Driver
 *
 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2003 IBM Corp.
 * Copyright (C) 2003 Rolf Eike Beer <eike-kernel@sf-tec.de>
 *
 * Based on ideas and code from:
 * 	Vladimir Kondratiev <vladimir.kondratiev@intel.com>
 *	Rolf Eike Beer <eike-kernel@sf-tec.de>
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2 of the License.
 *
 * Send feedback to <greg@kroah.com>
 */

/*
 *
 * This driver will "emulate" removing PCI devices from the system.  If
 * the "power" file is written to with "0" then the specified PCI device
 * will be completely removed from the kernel.
 *
 * WARNING, this does NOT turn off the power to the PCI device.  This is
 * a "logical" removal, not a physical or electrical removal.
 *
 * Use this module at your own risk, you have been warned!
 *
 * Enabling PCI devices is left as an exercise for the reader...
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "../pci.h"

#if !defined(MODULE)
	#define MY_NAME	"fakephp"
#else
	#define MY_NAME	THIS_MODULE->name
#endif

#define dbg(format, arg...)					\
	do {							\
		if (debug)					\
			printk(KERN_DEBUG "%s: " format,	\
				MY_NAME , ## arg); 		\
	} while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME , ## arg)

#define DRIVER_AUTHOR	"Greg Kroah-Hartman <greg@kroah.com>"
#define DRIVER_DESC	"Fake PCI Hot Plug Controller Driver"

struct dummy_slot {
	struct list_head node;
	struct hotplug_slot *slot;
	struct pci_dev *dev;
	struct work_struct remove_work;
	unsigned long removed;
};

static int debug;
static LIST_HEAD(slot_list);
static struct workqueue_struct *dummyphp_wq;

static void pci_rescan_worker(struct work_struct *work);
static DECLARE_WORK(pci_rescan_work, pci_rescan_worker);

static int enable_slot (struct hotplug_slot *slot);
static int disable_slot (struct hotplug_slot *slot);

static struct hotplug_slot_ops dummy_hotplug_slot_ops = {
	.owner			= THIS_MODULE,
	.enable_slot		= enable_slot,
	.disable_slot		= disable_slot,
};

static void dummy_release(struct hotplug_slot *slot)
{
	struct dummy_slot *dslot = slot->private;

	list_del(&dslot->node);
	kfree(dslot->slot->info);
	kfree(dslot->slot);
	pci_dev_put(dslot->dev);
	kfree(dslot);
}

static int add_slot(struct pci_dev *dev)
{
	struct dummy_slot *dslot;
	struct hotplug_slot *slot;
	int retval = -ENOMEM;

	slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
	if (!slot)
		goto error;

	slot->info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
	if (!slot->info)
		goto error_slot;

	slot->info->power_status = 1;
	slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
	slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;

	slot->name = &dev->dev.bus_id[0];
	dbg("slot->name = %s\n", slot->name);

	dslot = kzalloc(sizeof(struct dummy_slot), GFP_KERNEL);
	if (!dslot)
		goto error_info;

	slot->ops = &dummy_hotplug_slot_ops;
	slot->release = &dummy_release;
	slot->private = dslot;

	retval = pci_hp_register(slot);
	if (retval) {
		err("pci_hp_register failed with error %d\n", retval);
		goto error_dslot;
	}

	dslot->slot = slot;
	dslot->dev = pci_dev_get(dev);
	list_add (&dslot->node, &slot_list);
	return retval;

error_dslot:
	kfree(dslot);
error_info:
	kfree(slot->info);
error_slot:
	kfree(slot);
error:
	return retval;
}

static int __init pci_scan_buses(void)
{
	struct pci_dev *dev = NULL;
	int retval = 0;

	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
		retval = add_slot(dev);
		if (retval) {
			pci_dev_put(dev);
			break;
		}
	}

	return retval;
}

static void remove_slot(struct dummy_slot *dslot)
{
	int retval;

	dbg("removing slot %s\n", dslot->slot->name);
	retval = pci_hp_deregister(dslot->slot);
	if (retval)
		err("Problem unregistering a slot %s\n", dslot->slot->name);
}

/* called from the single-threaded workqueue handler to remove a slot */
static void remove_slot_worker(struct work_struct *work)
{
	struct dummy_slot *dslot =
		container_of(work, struct dummy_slot, remove_work);
	remove_slot(dslot);
}

/**
 * Rescan slot.
 * Tries hard not to re-enable already existing devices
 * also handles scanning of subfunctions
 *
 * @param temp   Device template. Should be set: bus and devfn.
 */
static void pci_rescan_slot(struct pci_dev *temp)
{
	struct pci_bus *bus = temp->bus;
	struct pci_dev *dev;
	int func;
	int retval;
	u8 hdr_type;

	if (!pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type)) {
		temp->hdr_type = hdr_type & 0x7f;
		if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
			pci_dev_put(dev);
		else {
			dev = pci_scan_single_device(bus, temp->devfn);
			if (dev) {
				dbg("New device on %s function %x:%x\n",
					bus->name, temp->devfn >> 3,
					temp->devfn & 7);
				retval = pci_bus_add_device(dev);
				if (retval)
					dev_err(&dev->dev, "error adding "
						"device, continuing.\n");
				else
					add_slot(dev);
			}
		}
		/* multifunction device? */
		if (!(hdr_type & 0x80))
			return;

		/* continue scanning for other functions */
		for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
			if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
				continue;
			temp->hdr_type = hdr_type & 0x7f;

			if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
				pci_dev_put(dev);
			else {
				dev = pci_scan_single_device(bus, temp->devfn);
				if (dev) {
					dbg("New device on %s function %x:%x\n",
						bus->name, temp->devfn >> 3,
						temp->devfn & 7);
					retval = pci_bus_add_device(dev);
					if (retval)
						dev_err(&dev->dev, "error adding "
							"device, continuing.\n");
					else
						add_slot(dev);
				}
			}
		}
	}
}


/**
 * Rescan PCI bus.
 * call pci_rescan_slot for each possible function of the bus
 *
 * @param bus
 */
static void pci_rescan_bus(const struct pci_bus *bus)
{
	unsigned int devfn;
	struct pci_dev *dev;
	dev = alloc_pci_dev();
	if (!dev)
		return;

	dev->bus = (struct pci_bus*)bus;
	dev->sysdata = bus->sysdata;
	for (devfn = 0; devfn < 0x100; devfn += 8) {
		dev->devfn = devfn;
		pci_rescan_slot(dev);
	}
	kfree(dev);
}

/* recursively scan all buses */
static void pci_rescan_buses(const struct list_head *list)
{
	const struct list_head *l;
	list_for_each(l,list) {
		const struct pci_bus *b = pci_bus_b(l);
		pci_rescan_bus(b);
		pci_rescan_buses(&b->children);
	}
}

/* initiate rescan of all pci buses */
static inline void pci_rescan(void) {
	pci_rescan_buses(&pci_root_buses);
}

/* called from the single-threaded workqueue handler to rescan all pci buses */
static void pci_rescan_worker(struct work_struct *work)
{
	pci_rescan();
}

static int enable_slot(struct hotplug_slot *hotplug_slot)
{
	/* mis-use enable_slot for rescanning of the pci bus */
	cancel_work_sync(&pci_rescan_work);
	queue_work(dummyphp_wq, &pci_rescan_work);
	return -ENODEV;
}

/* find the hotplug_slot for the pci_dev */
static struct hotplug_slot *get_slot_from_dev(struct pci_dev *dev)
{
	struct dummy_slot *dslot;

	list_for_each_entry(dslot, &slot_list, node) {
		if (dslot->dev == dev)
			return dslot->slot;
	}
	return NULL;
}


static int disable_slot(struct hotplug_slot *slot)
{
	struct dummy_slot *dslot;
	struct hotplug_slot *hslot;
	struct pci_dev *dev;
	int func;

	if (!slot)
		return -ENODEV;
	dslot = slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, slot->name);

	/* don't disable bridged devices just yet, we can't handle them easily... */
	if (dslot->dev->subordinate) {
		err("Can't remove PCI devices with other PCI devices behind it yet.\n");
		return -ENODEV;
	}
	if (test_and_set_bit(0, &dslot->removed)) {
		dbg("Slot already scheduled for removal\n");
		return -ENODEV;
	}
	/* search for subfunctions and disable them first */
	if (!(dslot->dev->devfn & 7)) {
		for (func = 1; func < 8; func++) {
			dev = pci_get_slot(dslot->dev->bus,
					dslot->dev->devfn + func);
			if (dev) {
				hslot = get_slot_from_dev(dev);
				if (hslot)
					disable_slot(hslot);
				else {
					err("Hotplug slot not found for subfunction of PCI device\n");
					return -ENODEV;
				}
				pci_dev_put(dev);
			} else
				dbg("No device in slot found\n");
		}
	}

	/* remove the device from the pci core */
	pci_remove_bus_device(dslot->dev);

	/* queue work item to blow away this sysfs entry and other parts. */
	INIT_WORK(&dslot->remove_work, remove_slot_worker);
	queue_work(dummyphp_wq, &dslot->remove_work);

	return 0;
}

static void cleanup_slots (void)
{
	struct list_head *tmp;
	struct list_head *next;
	struct dummy_slot *dslot;

	destroy_workqueue(dummyphp_wq);
	list_for_each_safe (tmp, next, &slot_list) {
		dslot = list_entry (tmp, struct dummy_slot, node);
		remove_slot(dslot);
	}
	
}

static int __init dummyphp_init(void)
{
	info(DRIVER_DESC "\n");

	dummyphp_wq = create_singlethread_workqueue(MY_NAME);
	if (!dummyphp_wq)
		return -ENOMEM;

	return pci_scan_buses();
}


static void __exit dummyphp_exit(void)
{
	cleanup_slots();
}

module_init(dummyphp_init);
module_exit(dummyphp_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Fake PCI Hot Plug Controller Driver
	3	*
	4	* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
	5	* Copyright (C) 2003 IBM Corp.
	6	* Copyright (C) 2003 Rolf Eike Beer <eike-kernel@sf-tec.de>
	7	*
	8	* Based on ideas and code from:
	9	* Vladimir Kondratiev <vladimir.kondratiev@intel.com>
	10	* Rolf Eike Beer <eike-kernel@sf-tec.de>
	11	*
	12	* All rights reserved.
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation, version 2 of the License.
	17	*
	18	* Send feedback to <greg@kroah.com>
	19	*/
	20
	21	/*
	22	*
	23	* This driver will "emulate" removing PCI devices from the system. If
	24	* the "power" file is written to with "0" then the specified PCI device
	25	* will be completely removed from the kernel.
	26	*
	27	* WARNING, this does NOT turn off the power to the PCI device. This is
	28	* a "logical" removal, not a physical or electrical removal.
	29	*
	30	* Use this module at your own risk, you have been warned!
	31	*
	32	* Enabling PCI devices is left as an exercise for the reader...
	33	*
	34	*/
1da177e4 LT	35	#include <linux/kernel.h>
	36	#include <linux/module.h>
	37	#include <linux/pci.h>
7a54f25c	38	#include <linux/pci_hotplug.h>
1da177e4	39	#include <linux/init.h>
4e57b681 TS	40	#include <linux/string.h>
4e57b681 TS	41	#include <linux/slab.h>
f70995b2	42	#include <linux/workqueue.h>
1da177e4 LT	43	#include "../pci.h"
	44
	45	#if !defined(MODULE)
	46	#define MY_NAME "fakephp"
	47	#else
	48	#define MY_NAME THIS_MODULE->name
	49	#endif
	50
	51	#define dbg(format, arg...) \
	52	do { \
	53	if (debug) \
	54	printk(KERN_DEBUG "%s: " format, \
	55	MY_NAME , ## arg); \
	56	} while (0)
	57	#define err(format, arg...) printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
	58	#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
	59
	60	#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
	61	#define DRIVER_DESC "Fake PCI Hot Plug Controller Driver"
	62
	63	struct dummy_slot {
	64	struct list_head node;
	65	struct hotplug_slot *slot;
	66	struct pci_dev *dev;
f70995b2 IA	67	struct work_struct remove_work;
f70995b2 IA	68	unsigned long removed;
1da177e4 LT	69	};
	70
	71	static int debug;
	72	static LIST_HEAD(slot_list);
f70995b2 IA	73	static struct workqueue_struct *dummyphp_wq;
	74
	75	static void pci_rescan_worker(struct work_struct *work);
	76	static DECLARE_WORK(pci_rescan_work, pci_rescan_worker);
1da177e4 LT	77
	78	static int enable_slot (struct hotplug_slot *slot);
	79	static int disable_slot (struct hotplug_slot *slot);
	80
	81	static struct hotplug_slot_ops dummy_hotplug_slot_ops = {
	82	.owner = THIS_MODULE,
	83	.enable_slot = enable_slot,
	84	.disable_slot = disable_slot,
	85	};
	86
	87	static void dummy_release(struct hotplug_slot *slot)
	88	{
	89	struct dummy_slot *dslot = slot->private;
	90
	91	list_del(&dslot->node);
	92	kfree(dslot->slot->info);
	93	kfree(dslot->slot);
	94	pci_dev_put(dslot->dev);
	95	kfree(dslot);
	96	}
	97
	98	static int add_slot(struct pci_dev *dev)
	99	{
	100	struct dummy_slot *dslot;
	101	struct hotplug_slot *slot;
	102	int retval = -ENOMEM;
	103
f5afe806	104	slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
1da177e4 LT	105	if (!slot)
1da177e4 LT	106	goto error;
1da177e4	107
f5afe806	108	slot->info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
1da177e4 LT	109	if (!slot->info)
1da177e4 LT	110	goto error_slot;
1da177e4 LT	111
	112	slot->info->power_status = 1;
	113	slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
	114	slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
	115
	116	slot->name = &dev->dev.bus_id[0];
	117	dbg("slot->name = %s\n", slot->name);
	118
f70995b2	119	dslot = kzalloc(sizeof(struct dummy_slot), GFP_KERNEL);
1da177e4 LT	120	if (!dslot)
	121	goto error_info;
	122
	123	slot->ops = &dummy_hotplug_slot_ops;
	124	slot->release = &dummy_release;
	125	slot->private = dslot;
	126
	127	retval = pci_hp_register(slot);
	128	if (retval) {
	129	err("pci_hp_register failed with error %d\n", retval);
	130	goto error_dslot;
	131	}
	132
	133	dslot->slot = slot;
	134	dslot->dev = pci_dev_get(dev);
	135	list_add (&dslot->node, &slot_list);
	136	return retval;
	137
	138	error_dslot:
	139	kfree(dslot);
	140	error_info:
	141	kfree(slot->info);
	142	error_slot:
	143	kfree(slot);
	144	error:
	145	return retval;
	146	}
	147
	148	static int __init pci_scan_buses(void)
	149	{
	150	struct pci_dev *dev = NULL;
	151	int retval = 0;
	152
	153	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
	154	retval = add_slot(dev);
	155	if (retval) {
	156	pci_dev_put(dev);
	157	break;
	158	}
	159	}
	160
	161	return retval;
	162	}
	163
	164	static void remove_slot(struct dummy_slot *dslot)
	165	{
	166	int retval;
	167
	168	dbg("removing slot %s\n", dslot->slot->name);
	169	retval = pci_hp_deregister(dslot->slot);
	170	if (retval)
	171	err("Problem unregistering a slot %s\n", dslot->slot->name);
	172	}
	173
f70995b2 IA	174	/* called from the single-threaded workqueue handler to remove a slot */
	175	static void remove_slot_worker(struct work_struct *work)
	176	{
	177	struct dummy_slot *dslot =
	178	container_of(work, struct dummy_slot, remove_work);
	179	remove_slot(dslot);
	180	}
	181
1da177e4 LT	182	/**
	183	* Rescan slot.
	184	* Tries hard not to re-enable already existing devices
	185	* also handles scanning of subfunctions
	186	*
	187	* @param temp Device template. Should be set: bus and devfn.
	188	*/
	189	static void pci_rescan_slot(struct pci_dev *temp)
	190	{
	191	struct pci_bus *bus = temp->bus;
	192	struct pci_dev *dev;
	193	int func;
b19441af	194	int retval;
1da177e4	195	u8 hdr_type;
b19441af	196
1da177e4 LT	197	if (!pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type)) {
1da177e4 LT	198	temp->hdr_type = hdr_type & 0x7f;
094ed76e AC	199	if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
	200	pci_dev_put(dev);
	201	else {
1da177e4 LT	202	dev = pci_scan_single_device(bus, temp->devfn);
	203	if (dev) {
	204	dbg("New device on %s function %x:%x\n",
	205	bus->name, temp->devfn >> 3,
	206	temp->devfn & 7);
b19441af GKH	207	retval = pci_bus_add_device(dev);
	208	if (retval)
	209	dev_err(&dev->dev, "error adding "
	210	"device, continuing.\n");
	211	else
	212	add_slot(dev);
1da177e4 LT	213	}
	214	}
	215	/* multifunction device? */
	216	if (!(hdr_type & 0x80))
	217	return;
	218
	219	/* continue scanning for other functions */
	220	for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
	221	if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
	222	continue;
	223	temp->hdr_type = hdr_type & 0x7f;
	224
094ed76e AC	225	if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
	226	pci_dev_put(dev);
	227	else {
1da177e4 LT	228	dev = pci_scan_single_device(bus, temp->devfn);
	229	if (dev) {
	230	dbg("New device on %s function %x:%x\n",
	231	bus->name, temp->devfn >> 3,
	232	temp->devfn & 7);
b19441af GKH	233	retval = pci_bus_add_device(dev);
	234	if (retval)
	235	dev_err(&dev->dev, "error adding "
	236	"device, continuing.\n");
	237	else
	238	add_slot(dev);
1da177e4 LT	239	}
	240	}
	241	}
	242	}
	243	}
	244
	245
	246	/**
	247	* Rescan PCI bus.
	248	* call pci_rescan_slot for each possible function of the bus
	249	*
	250	* @param bus
	251	*/
	252	static void pci_rescan_bus(const struct pci_bus *bus)
	253	{
	254	unsigned int devfn;
	255	struct pci_dev *dev;
bab41e9b	256	dev = alloc_pci_dev();
1da177e4 LT	257	if (!dev)
	258	return;
	259
1da177e4 LT	260	dev->bus = (struct pci_bus*)bus;
	261	dev->sysdata = bus->sysdata;
	262	for (devfn = 0; devfn < 0x100; devfn += 8) {
	263	dev->devfn = devfn;
	264	pci_rescan_slot(dev);
	265	}
	266	kfree(dev);
	267	}
	268
	269	/* recursively scan all buses */
	270	static void pci_rescan_buses(const struct list_head *list)
	271	{
	272	const struct list_head *l;
	273	list_for_each(l,list) {
	274	const struct pci_bus *b = pci_bus_b(l);
	275	pci_rescan_bus(b);
	276	pci_rescan_buses(&b->children);
	277	}
	278	}
	279
	280	/* initiate rescan of all pci buses */
	281	static inline void pci_rescan(void) {
	282	pci_rescan_buses(&pci_root_buses);
	283	}
	284
f70995b2 IA	285	/* called from the single-threaded workqueue handler to rescan all pci buses */
	286	static void pci_rescan_worker(struct work_struct *work)
	287	{
	288	pci_rescan();
	289	}
1da177e4 LT	290
	291	static int enable_slot(struct hotplug_slot *hotplug_slot)
	292	{
	293	/* mis-use enable_slot for rescanning of the pci bus */
f70995b2 IA	294	cancel_work_sync(&pci_rescan_work);
f70995b2 IA	295	queue_work(dummyphp_wq, &pci_rescan_work);
1da177e4 LT	296	return -ENODEV;
	297	}
	298
	299	/* find the hotplug_slot for the pci_dev */
	300	static struct hotplug_slot get_slot_from_dev(struct pci_dev dev)
	301	{
	302	struct dummy_slot *dslot;
	303
	304	list_for_each_entry(dslot, &slot_list, node) {
	305	if (dslot->dev == dev)
	306	return dslot->slot;
	307	}
	308	return NULL;
	309	}
	310
	311
	312	static int disable_slot(struct hotplug_slot *slot)
	313	{
	314	struct dummy_slot *dslot;
	315	struct hotplug_slot *hslot;
	316	struct pci_dev *dev;
	317	int func;
	318
	319	if (!slot)
	320	return -ENODEV;
	321	dslot = slot->private;
	322
	323	dbg("%s - physical_slot = %s\n", __FUNCTION__, slot->name);
	324
	325	/* don't disable bridged devices just yet, we can't handle them easily... */
	326	if (dslot->dev->subordinate) {
	327	err("Can't remove PCI devices with other PCI devices behind it yet.\n");
	328	return -ENODEV;
	329	}
f70995b2 IA	330	if (test_and_set_bit(0, &dslot->removed)) {
	331	dbg("Slot already scheduled for removal\n");
	332	return -ENODEV;
	333	}
1da177e4 LT	334	/* search for subfunctions and disable them first */
	335	if (!(dslot->dev->devfn & 7)) {
	336	for (func = 1; func < 8; func++) {
094ed76e	337	dev = pci_get_slot(dslot->dev->bus,
1da177e4 LT	338	dslot->dev->devfn + func);
	339	if (dev) {
	340	hslot = get_slot_from_dev(dev);
	341	if (hslot)
	342	disable_slot(hslot);
	343	else {
	344	err("Hotplug slot not found for subfunction of PCI device\n");
	345	return -ENODEV;
	346	}
094ed76e	347	pci_dev_put(dev);
1da177e4 LT	348	} else
	349	dbg("No device in slot found\n");
	350	}
	351	}
	352
	353	/* remove the device from the pci core */
	354	pci_remove_bus_device(dslot->dev);
	355
f70995b2 IA	356	/* queue work item to blow away this sysfs entry and other parts. */
	357	INIT_WORK(&dslot->remove_work, remove_slot_worker);
	358	queue_work(dummyphp_wq, &dslot->remove_work);
1da177e4 LT	359
	360	return 0;
	361	}
	362
	363	static void cleanup_slots (void)
	364	{
	365	struct list_head *tmp;
	366	struct list_head *next;
	367	struct dummy_slot *dslot;
	368
f70995b2	369	destroy_workqueue(dummyphp_wq);
1da177e4 LT	370	list_for_each_safe (tmp, next, &slot_list) {
	371	dslot = list_entry (tmp, struct dummy_slot, node);
	372	remove_slot(dslot);
	373	}
	374
	375	}
	376
	377	static int __init dummyphp_init(void)
	378	{
	379	info(DRIVER_DESC "\n");
	380
f70995b2 IA	381	dummyphp_wq = create_singlethread_workqueue(MY_NAME);
	382	if (!dummyphp_wq)
	383	return -ENOMEM;
	384
1da177e4 LT	385	return pci_scan_buses();
	386	}
	387
	388
	389	static void __exit dummyphp_exit(void)
	390	{
	391	cleanup_slots();
	392	}
	393
	394	module_init(dummyphp_init);
	395	module_exit(dummyphp_exit);
	396
	397	MODULE_AUTHOR(DRIVER_AUTHOR);
	398	MODULE_DESCRIPTION(DRIVER_DESC);
	399	MODULE_LICENSE("GPL");
	400	module_param(debug, bool, S_IRUGO \| S_IWUSR);
	401	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
	402