[mirror_ubuntu-bionic-kernel.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;
	char name[8];
};

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;
	static int count = 1;

	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;

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

	slot->name = dslot->name;
	snprintf(slot->name, sizeof(dslot->name), "fake%d", count++);
	dbg("slot->name = %s\n", slot->name);
	slot->ops = &dummy_hotplug_slot_ops;
	slot->release = &dummy_release;
	slot->private = dslot;

	retval = pci_hp_register(slot, dev->bus, PCI_SLOT(dev->devfn));
	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 lastslot = 0;

	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
		if (PCI_FUNC(dev->devfn) > 0 &&
				lastslot == PCI_SLOT(dev->devfn))
			continue;
		lastslot = PCI_SLOT(dev->devfn);
		add_slot(dev);
	}

	return 0;
}

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);
}

/**
 * pci_rescan_slot - Rescan slot
 * @temp: Device template. Should be set: bus and devfn.
 *
 * Tries hard not to re-enable already existing devices;
 * also handles scanning of subfunctions.
 */
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);
				}
			}
		}
	}
}


/**
 * pci_rescan_bus - Rescan PCI bus
 * @bus: the PCI bus to rescan
 *
 * Call pci_rescan_slot for each possible function of the 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 0;
}

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

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

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

	for (func = 7; func >= 0; func--) {
		dev = pci_get_slot(dslot->dev->bus, dslot->dev->devfn + func);
		if (!dev)
			continue;

		if (test_and_set_bit(0, &dslot->removed)) {
			dbg("Slot already scheduled for removal\n");
			return -ENODEV;
		}

		/* 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);

		/* blow away this sysfs entry and other parts. */
		remove_slot(dslot);

		pci_dev_put(dev);
	}
	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>
5c796ae7	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;
5c796ae7 IA	67	struct work_struct remove_work;
5c796ae7 IA	68	unsigned long removed;
fe99740c	69	char name[8];
1da177e4 LT	70	};
	71
	72	static int debug;
	73	static LIST_HEAD(slot_list);
5c796ae7 IA	74	static struct workqueue_struct *dummyphp_wq;
	75
	76	static void pci_rescan_worker(struct work_struct *work);
	77	static DECLARE_WORK(pci_rescan_work, pci_rescan_worker);
1da177e4 LT	78
	79	static int enable_slot (struct hotplug_slot *slot);
	80	static int disable_slot (struct hotplug_slot *slot);
	81
	82	static struct hotplug_slot_ops dummy_hotplug_slot_ops = {
	83	.owner = THIS_MODULE,
	84	.enable_slot = enable_slot,
	85	.disable_slot = disable_slot,
	86	};
	87
	88	static void dummy_release(struct hotplug_slot *slot)
	89	{
	90	struct dummy_slot *dslot = slot->private;
	91
	92	list_del(&dslot->node);
	93	kfree(dslot->slot->info);
	94	kfree(dslot->slot);
	95	pci_dev_put(dslot->dev);
	96	kfree(dslot);
	97	}
	98
	99	static int add_slot(struct pci_dev *dev)
	100	{
	101	struct dummy_slot *dslot;
	102	struct hotplug_slot *slot;
	103	int retval = -ENOMEM;
fe99740c	104	static int count = 1;
1da177e4	105
f5afe806	106	slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
1da177e4 LT	107	if (!slot)
1da177e4 LT	108	goto error;
1da177e4	109
f5afe806	110	slot->info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
1da177e4 LT	111	if (!slot->info)
1da177e4 LT	112	goto error_slot;
1da177e4 LT	113
	114	slot->info->power_status = 1;
	115	slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
	116	slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
	117
5c796ae7	118	dslot = kzalloc(sizeof(struct dummy_slot), GFP_KERNEL);
1da177e4 LT	119	if (!dslot)
	120	goto error_info;
	121
fe99740c AC	122	slot->name = dslot->name;
	123	snprintf(slot->name, sizeof(dslot->name), "fake%d", count++);
	124	dbg("slot->name = %s\n", slot->name);
1da177e4 LT	125	slot->ops = &dummy_hotplug_slot_ops;
	126	slot->release = &dummy_release;
	127	slot->private = dslot;
	128
f46753c5	129	retval = pci_hp_register(slot, dev->bus, PCI_SLOT(dev->devfn));
1da177e4 LT	130	if (retval) {
	131	err("pci_hp_register failed with error %d\n", retval);
	132	goto error_dslot;
	133	}
	134
	135	dslot->slot = slot;
	136	dslot->dev = pci_dev_get(dev);
	137	list_add (&dslot->node, &slot_list);
	138	return retval;
	139
	140	error_dslot:
	141	kfree(dslot);
	142	error_info:
	143	kfree(slot->info);
	144	error_slot:
	145	kfree(slot);
	146	error:
	147	return retval;
	148	}
	149
	150	static int __init pci_scan_buses(void)
	151	{
	152	struct pci_dev *dev = NULL;
fe99740c	153	int lastslot = 0;
1da177e4 LT	154
1da177e4 LT	155	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
fe99740c AC	156	if (PCI_FUNC(dev->devfn) > 0 &&
	157	lastslot == PCI_SLOT(dev->devfn))
	158	continue;
	159	lastslot = PCI_SLOT(dev->devfn);
	160	add_slot(dev);
1da177e4 LT	161	}
1da177e4 LT	162
fe99740c	163	return 0;
1da177e4 LT	164	}
	165
	166	static void remove_slot(struct dummy_slot *dslot)
	167	{
	168	int retval;
	169
	170	dbg("removing slot %s\n", dslot->slot->name);
	171	retval = pci_hp_deregister(dslot->slot);
	172	if (retval)
	173	err("Problem unregistering a slot %s\n", dslot->slot->name);
	174	}
	175
5c796ae7 IA	176	/* called from the single-threaded workqueue handler to remove a slot */
	177	static void remove_slot_worker(struct work_struct *work)
	178	{
	179	struct dummy_slot *dslot =
	180	container_of(work, struct dummy_slot, remove_work);
	181	remove_slot(dslot);
	182	}
	183
1da177e4	184	/**
26e6c66e RD	185	* pci_rescan_slot - Rescan slot
26e6c66e RD	186	* @temp: Device template. Should be set: bus and devfn.
1da177e4	187	*
26e6c66e RD	188	* Tries hard not to re-enable already existing devices;
26e6c66e RD	189	* also handles scanning of subfunctions.
1da177e4 LT	190	*/
	191	static void pci_rescan_slot(struct pci_dev *temp)
	192	{
	193	struct pci_bus *bus = temp->bus;
	194	struct pci_dev *dev;
	195	int func;
b19441af	196	int retval;
1da177e4	197	u8 hdr_type;
b19441af	198
1da177e4 LT	199	if (!pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type)) {
1da177e4 LT	200	temp->hdr_type = hdr_type & 0x7f;
094ed76e AC	201	if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
	202	pci_dev_put(dev);
	203	else {
1da177e4 LT	204	dev = pci_scan_single_device(bus, temp->devfn);
	205	if (dev) {
	206	dbg("New device on %s function %x:%x\n",
	207	bus->name, temp->devfn >> 3,
	208	temp->devfn & 7);
b19441af GKH	209	retval = pci_bus_add_device(dev);
	210	if (retval)
	211	dev_err(&dev->dev, "error adding "
	212	"device, continuing.\n");
	213	else
	214	add_slot(dev);
1da177e4 LT	215	}
	216	}
	217	/* multifunction device? */
	218	if (!(hdr_type & 0x80))
	219	return;
	220
	221	/* continue scanning for other functions */
	222	for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
	223	if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
	224	continue;
	225	temp->hdr_type = hdr_type & 0x7f;
	226
094ed76e AC	227	if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
	228	pci_dev_put(dev);
	229	else {
1da177e4 LT	230	dev = pci_scan_single_device(bus, temp->devfn);
	231	if (dev) {
	232	dbg("New device on %s function %x:%x\n",
	233	bus->name, temp->devfn >> 3,
	234	temp->devfn & 7);
b19441af GKH	235	retval = pci_bus_add_device(dev);
	236	if (retval)
	237	dev_err(&dev->dev, "error adding "
	238	"device, continuing.\n");
	239	else
	240	add_slot(dev);
1da177e4 LT	241	}
	242	}
	243	}
	244	}
	245	}
	246
	247
	248	/**
26e6c66e RD	249	* pci_rescan_bus - Rescan PCI bus
26e6c66e RD	250	* @bus: the PCI bus to rescan
1da177e4	251	*
26e6c66e	252	* Call pci_rescan_slot for each possible function of the bus.
1da177e4 LT	253	*/
	254	static void pci_rescan_bus(const struct pci_bus *bus)
	255	{
	256	unsigned int devfn;
	257	struct pci_dev *dev;
bab41e9b	258	dev = alloc_pci_dev();
1da177e4 LT	259	if (!dev)
	260	return;
	261
1da177e4 LT	262	dev->bus = (struct pci_bus*)bus;
	263	dev->sysdata = bus->sysdata;
	264	for (devfn = 0; devfn < 0x100; devfn += 8) {
	265	dev->devfn = devfn;
	266	pci_rescan_slot(dev);
	267	}
	268	kfree(dev);
	269	}
	270
	271	/* recursively scan all buses */
	272	static void pci_rescan_buses(const struct list_head *list)
	273	{
	274	const struct list_head *l;
	275	list_for_each(l,list) {
	276	const struct pci_bus *b = pci_bus_b(l);
	277	pci_rescan_bus(b);
	278	pci_rescan_buses(&b->children);
	279	}
	280	}
	281
	282	/* initiate rescan of all pci buses */
	283	static inline void pci_rescan(void) {
	284	pci_rescan_buses(&pci_root_buses);
	285	}
	286
5c796ae7 IA	287	/* called from the single-threaded workqueue handler to rescan all pci buses */
	288	static void pci_rescan_worker(struct work_struct *work)
	289	{
	290	pci_rescan();
	291	}
1da177e4 LT	292
	293	static int enable_slot(struct hotplug_slot *hotplug_slot)
	294	{
	295	/* mis-use enable_slot for rescanning of the pci bus */
5c796ae7 IA	296	cancel_work_sync(&pci_rescan_work);
5c796ae7 IA	297	queue_work(dummyphp_wq, &pci_rescan_work);
ca99eb8c	298	return 0;
1da177e4 LT	299	}
1da177e4 LT	300
1da177e4 LT	301	static int disable_slot(struct hotplug_slot *slot)
	302	{
	303	struct dummy_slot *dslot;
1da177e4 LT	304	struct pci_dev *dev;
	305	int func;
	306
	307	if (!slot)
	308	return -ENODEV;
	309	dslot = slot->private;
	310
66bef8c0	311	dbg("%s - physical_slot = %s\n", __func__, slot->name);
1da177e4	312
fe99740c AC	313	for (func = 7; func >= 0; func--) {
	314	dev = pci_get_slot(dslot->dev->bus, dslot->dev->devfn + func);
	315	if (!dev)
	316	continue;
	317
	318	if (test_and_set_bit(0, &dslot->removed)) {
	319	dbg("Slot already scheduled for removal\n");
	320	return -ENODEV;
1da177e4	321	}
1da177e4	322
fe99740c AC	323	/* queue work item to blow away this sysfs entry and other
	324	* parts.
	325	*/
	326	INIT_WORK(&dslot->remove_work, remove_slot_worker);
	327	queue_work(dummyphp_wq, &dslot->remove_work);
1da177e4	328
fe99740c AC	329	/* blow away this sysfs entry and other parts. */
fe99740c AC	330	remove_slot(dslot);
1da177e4	331
fe99740c AC	332	pci_dev_put(dev);
fe99740c AC	333	}
1da177e4 LT	334	return 0;
	335	}
	336
	337	static void cleanup_slots (void)
	338	{
	339	struct list_head *tmp;
	340	struct list_head *next;
	341	struct dummy_slot *dslot;
	342
5c796ae7	343	destroy_workqueue(dummyphp_wq);
1da177e4 LT	344	list_for_each_safe (tmp, next, &slot_list) {
	345	dslot = list_entry (tmp, struct dummy_slot, node);
	346	remove_slot(dslot);
	347	}
	348
	349	}
	350
	351	static int __init dummyphp_init(void)
	352	{
	353	info(DRIVER_DESC "\n");
	354
5c796ae7 IA	355	dummyphp_wq = create_singlethread_workqueue(MY_NAME);
	356	if (!dummyphp_wq)
	357	return -ENOMEM;
	358
1da177e4 LT	359	return pci_scan_buses();
	360	}
	361
	362
	363	static void __exit dummyphp_exit(void)
	364	{
	365	cleanup_slots();
	366	}
	367
	368	module_init(dummyphp_init);
	369	module_exit(dummyphp_exit);
	370
	371	MODULE_AUTHOR(DRIVER_AUTHOR);
	372	MODULE_DESCRIPTION(DRIVER_DESC);
	373	MODULE_LICENSE("GPL");
	374	module_param(debug, bool, S_IRUGO \| S_IWUSR);
	375	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
	376