[deliverable/linux.git] / drivers / block / aoe / aoedev.c

/* Copyright (c) 2012 Coraid, Inc.  See COPYING for GPL terms. */
/*
 * aoedev.c
 * AoE device utility functions; maintains device list.
 */

#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/bitmap.h>
#include <linux/kdev_t.h>
#include "aoe.h"

static void dummy_timer(ulong);
static void aoedev_freedev(struct aoedev *);
static void freetgt(struct aoedev *d, struct aoetgt *t);
static void skbpoolfree(struct aoedev *d);

static struct aoedev *devlist;
static DEFINE_SPINLOCK(devlist_lock);

/* Because some systems will have one, many, or no
 *   - partitions,
 *   - slots per shelf,
 *   - or shelves,
 * we need some flexibility in the way the minor numbers
 * are allocated.  So they are dynamic.
 */
#define N_DEVS ((1U<<MINORBITS)/AOE_PARTITIONS)

static DEFINE_SPINLOCK(used_minors_lock);
static DECLARE_BITMAP(used_minors, N_DEVS);

static int
minor_get(ulong *minor)
{
	ulong flags;
	ulong n;
	int error = 0;

	spin_lock_irqsave(&used_minors_lock, flags);
	n = find_first_zero_bit(used_minors, N_DEVS);
	if (n < N_DEVS)
		set_bit(n, used_minors);
	else
		error = -1;
	spin_unlock_irqrestore(&used_minors_lock, flags);

	*minor = n * AOE_PARTITIONS;
	return error;
}

static void
minor_free(ulong minor)
{
	ulong flags;

	minor /= AOE_PARTITIONS;
	BUG_ON(minor >= N_DEVS);

	spin_lock_irqsave(&used_minors_lock, flags);
	BUG_ON(!test_bit(minor, used_minors));
	clear_bit(minor, used_minors);
	spin_unlock_irqrestore(&used_minors_lock, flags);
}

/*
 * Users who grab a pointer to the device with aoedev_by_aoeaddr
 * automatically get a reference count and must be responsible
 * for performing a aoedev_put.  With the addition of async
 * kthread processing I'm no longer confident that we can
 * guarantee consistency in the face of device flushes.
 *
 * For the time being, we only bother to add extra references for
 * frames sitting on the iocq.  When the kthreads finish processing
 * these frames, they will aoedev_put the device.
 */

void
aoedev_put(struct aoedev *d)
{
	ulong flags;

	spin_lock_irqsave(&devlist_lock, flags);
	d->ref--;
	spin_unlock_irqrestore(&devlist_lock, flags);
}

static void
dummy_timer(ulong vp)
{
	struct aoedev *d;

	d = (struct aoedev *)vp;
	if (d->flags & DEVFL_TKILL)
		return;
	d->timer.expires = jiffies + HZ;
	add_timer(&d->timer);
}

static void
aoe_failip(struct aoedev *d)
{
	struct request *rq;
	struct bio *bio;
	unsigned long n;

	aoe_failbuf(d, d->ip.buf);

	rq = d->ip.rq;
	if (rq == NULL)
		return;
	while ((bio = d->ip.nxbio)) {
		clear_bit(BIO_UPTODATE, &bio->bi_flags);
		d->ip.nxbio = bio->bi_next;
		n = (unsigned long) rq->special;
		rq->special = (void *) --n;
	}
	if ((unsigned long) rq->special == 0)
		aoe_end_request(d, rq, 0);
}

void
aoedev_downdev(struct aoedev *d)
{
	struct aoetgt *t, **tt, **te;
	struct frame *f;
	struct list_head *head, *pos, *nx;
	struct request *rq;
	int i;

	d->flags &= ~DEVFL_UP;

	/* clean out active buffers */
	for (i = 0; i < NFACTIVE; i++) {
		head = &d->factive[i];
		list_for_each_safe(pos, nx, head) {
			f = list_entry(pos, struct frame, head);
			list_del(pos);
			if (f->buf) {
				f->buf->nframesout--;
				aoe_failbuf(d, f->buf);
			}
			aoe_freetframe(f);
		}
	}
	/* reset window dressings */
	tt = d->targets;
	te = tt + NTARGETS;
	for (; tt < te && (t = *tt); tt++) {
		t->maxout = t->nframes;
		t->nout = 0;
	}

	/* clean out the in-process request (if any) */
	aoe_failip(d);
	d->htgt = NULL;

	/* fast fail all pending I/O */
	if (d->blkq) {
		while ((rq = blk_peek_request(d->blkq))) {
			blk_start_request(rq);
			aoe_end_request(d, rq, 1);
		}
	}

	if (d->gd)
		set_capacity(d->gd, 0);
}

static void
aoedev_freedev(struct aoedev *d)
{
	struct aoetgt **t, **e;

	cancel_work_sync(&d->work);
	if (d->gd) {
		aoedisk_rm_sysfs(d);
		del_gendisk(d->gd);
		put_disk(d->gd);
		blk_cleanup_queue(d->blkq);
	}
	t = d->targets;
	e = t + NTARGETS;
	for (; t < e && *t; t++)
		freetgt(d, *t);
	if (d->bufpool)
		mempool_destroy(d->bufpool);
	skbpoolfree(d);
	minor_free(d->sysminor);
	kfree(d);
}

int
aoedev_flush(const char __user *str, size_t cnt)
{
	ulong flags;
	struct aoedev *d, **dd;
	struct aoedev *rmd = NULL;
	char buf[16];
	int all = 0;

	if (cnt >= 3) {
		if (cnt > sizeof buf)
			cnt = sizeof buf;
		if (copy_from_user(buf, str, cnt))
			return -EFAULT;
		all = !strncmp(buf, "all", 3);
	}

	spin_lock_irqsave(&devlist_lock, flags);
	dd = &devlist;
	while ((d = *dd)) {
		spin_lock(&d->lock);
		if ((!all && (d->flags & DEVFL_UP))
		|| (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
		|| d->nopen
		|| d->ref) {
			spin_unlock(&d->lock);
			dd = &d->next;
			continue;
		}
		*dd = d->next;
		aoedev_downdev(d);
		d->flags |= DEVFL_TKILL;
		spin_unlock(&d->lock);
		d->next = rmd;
		rmd = d;
	}
	spin_unlock_irqrestore(&devlist_lock, flags);
	while ((d = rmd)) {
		rmd = d->next;
		del_timer_sync(&d->timer);
		aoedev_freedev(d);	/* must be able to sleep */
	}
	return 0;
}

/* This has been confirmed to occur once with Tms=3*1000 due to the
 * driver changing link and not processing its transmit ring.  The
 * problem is hard enough to solve by returning an error that I'm
 * still punting on "solving" this.
 */
static void
skbfree(struct sk_buff *skb)
{
	enum { Sms = 250, Tms = 30 * 1000};
	int i = Tms / Sms;

	if (skb == NULL)
		return;
	while (atomic_read(&skb_shinfo(skb)->dataref) != 1 && i-- > 0)
		msleep(Sms);
	if (i < 0) {
		printk(KERN_ERR
			"aoe: %s holds ref: %s\n",
			skb->dev ? skb->dev->name : "netif",
			"cannot free skb -- memory leaked.");
		return;
	}
	skb->truesize -= skb->data_len;
	skb_shinfo(skb)->nr_frags = skb->data_len = 0;
	skb_trim(skb, 0);
	dev_kfree_skb(skb);
}

static void
skbpoolfree(struct aoedev *d)
{
	struct sk_buff *skb, *tmp;

	skb_queue_walk_safe(&d->skbpool, skb, tmp)
		skbfree(skb);

	__skb_queue_head_init(&d->skbpool);
}

/* find it or allocate it */
struct aoedev *
aoedev_by_aoeaddr(ulong maj, int min, int do_alloc)
{
	struct aoedev *d;
	int i;
	ulong flags;
	ulong sysminor;

	spin_lock_irqsave(&devlist_lock, flags);

	for (d=devlist; d; d=d->next)
		if (d->aoemajor == maj && d->aoeminor == min) {
			d->ref++;
			break;
		}
	if (d || !do_alloc || minor_get(&sysminor) < 0)
		goto out;
	d = kcalloc(1, sizeof *d, GFP_ATOMIC);
	if (!d)
		goto out;
	INIT_WORK(&d->work, aoecmd_sleepwork);
	spin_lock_init(&d->lock);
	skb_queue_head_init(&d->skbpool);
	init_timer(&d->timer);
	d->timer.data = (ulong) d;
	d->timer.function = dummy_timer;
	d->timer.expires = jiffies + HZ;
	add_timer(&d->timer);
	d->bufpool = NULL;	/* defer to aoeblk_gdalloc */
	d->tgt = d->targets;
	d->ref = 1;
	for (i = 0; i < NFACTIVE; i++)
		INIT_LIST_HEAD(&d->factive[i]);
	d->sysminor = sysminor;
	d->aoemajor = maj;
	d->aoeminor = min;
	d->mintimer = MINTIMER;
	d->next = devlist;
	devlist = d;
 out:
	spin_unlock_irqrestore(&devlist_lock, flags);
	return d;
}

static void
freetgt(struct aoedev *d, struct aoetgt *t)
{
	struct frame *f;
	struct list_head *pos, *nx, *head;
	struct aoeif *ifp;

	for (ifp = t->ifs; ifp < &t->ifs[NAOEIFS]; ++ifp) {
		if (!ifp->nd)
			break;
		dev_put(ifp->nd);
	}

	head = &t->ffree;
	list_for_each_safe(pos, nx, head) {
		list_del(pos);
		f = list_entry(pos, struct frame, head);
		skbfree(f->skb);
		kfree(f);
	}
	kfree(t);
}

void
aoedev_exit(void)
{
	struct aoedev *d;
	ulong flags;

	aoe_flush_iocq();
	while ((d = devlist)) {
		devlist = d->next;

		spin_lock_irqsave(&d->lock, flags);
		aoedev_downdev(d);
		d->flags |= DEVFL_TKILL;
		spin_unlock_irqrestore(&d->lock, flags);

		del_timer_sync(&d->timer);
		aoedev_freedev(d);
	}
}

int __init
aoedev_init(void)
{
	return 0;
}
Commit	Line	Data
fea05a26	1	/* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
1da177e4 LT	2	/*
	3	* aoedev.c
	4	* AoE device utility functions; maintains device list.
	5	*/
	6
	7	#include <linux/hdreg.h>
	8	#include <linux/blkdev.h>
	9	#include <linux/netdevice.h>
9bb237b6	10	#include <linux/delay.h>
5a0e3ad6	11	#include <linux/slab.h>
0c966214 EC	12	#include <linux/bitmap.h>
0c966214 EC	13	#include <linux/kdev_t.h>
1da177e4 LT	14	#include "aoe.h"
1da177e4 LT	15
262bf541 EC	16	static void dummy_timer(ulong);
262bf541 EC	17	static void aoedev_freedev(struct aoedev *);
9bb237b6 EC	18	static void freetgt(struct aoedev d, struct aoetgt t);
9bb237b6 EC	19	static void skbpoolfree(struct aoedev *d);
262bf541	20
1da177e4	21	static struct aoedev *devlist;
476aed38	22	static DEFINE_SPINLOCK(devlist_lock);
1da177e4	23
0c966214 EC	24	/* Because some systems will have one, many, or no
	25	* - partitions,
	26	* - slots per shelf,
	27	* - or shelves,
	28	* we need some flexibility in the way the minor numbers
	29	* are allocated. So they are dynamic.
69cf2d85	30	*/
0c966214 EC	31	#define N_DEVS ((1U<<MINORBITS)/AOE_PARTITIONS)
	32
	33	static DEFINE_SPINLOCK(used_minors_lock);
	34	static DECLARE_BITMAP(used_minors, N_DEVS);
	35
	36	static int
	37	minor_get(ulong *minor)
1da177e4	38	{
1da177e4	39	ulong flags;
0c966214 EC	40	ulong n;
	41	int error = 0;
	42
	43	spin_lock_irqsave(&used_minors_lock, flags);
	44	n = find_first_zero_bit(used_minors, N_DEVS);
	45	if (n < N_DEVS)
	46	set_bit(n, used_minors);
	47	else
	48	error = -1;
	49	spin_unlock_irqrestore(&used_minors_lock, flags);
	50
	51	minor = n AOE_PARTITIONS;
	52	return error;
	53	}
1da177e4	54
0c966214 EC	55	static void
	56	minor_free(ulong minor)
	57	{
	58	ulong flags;
1da177e4	59
0c966214 EC	60	minor /= AOE_PARTITIONS;
0c966214 EC	61	BUG_ON(minor >= N_DEVS);
1da177e4	62
0c966214 EC	63	spin_lock_irqsave(&used_minors_lock, flags);
	64	BUG_ON(!test_bit(minor, used_minors));
	65	clear_bit(minor, used_minors);
	66	spin_unlock_irqrestore(&used_minors_lock, flags);
1da177e4 LT	67	}
1da177e4 LT	68
0c966214 EC	69	/*
	70	* Users who grab a pointer to the device with aoedev_by_aoeaddr
	71	* automatically get a reference count and must be responsible
	72	* for performing a aoedev_put. With the addition of async
	73	* kthread processing I'm no longer confident that we can
	74	* guarantee consistency in the face of device flushes.
	75	*
	76	* For the time being, we only bother to add extra references for
	77	* frames sitting on the iocq. When the kthreads finish processing
	78	* these frames, they will aoedev_put the device.
	79	*/
	80
69cf2d85 EC	81	void
	82	aoedev_put(struct aoedev *d)
	83	{
	84	ulong flags;
	85
	86	spin_lock_irqsave(&devlist_lock, flags);
	87	d->ref--;
	88	spin_unlock_irqrestore(&devlist_lock, flags);
	89	}
	90
3ae1c24e EC	91	static void
	92	dummy_timer(ulong vp)
	93	{
	94	struct aoedev *d;
	95
	96	d = (struct aoedev *)vp;
	97	if (d->flags & DEVFL_TKILL)
	98	return;
	99	d->timer.expires = jiffies + HZ;
	100	add_timer(&d->timer);
	101	}
	102
69cf2d85 EC	103	static void
69cf2d85 EC	104	aoe_failip(struct aoedev *d)
1da177e4	105	{
69cf2d85	106	struct request *rq;
1da177e4	107	struct bio *bio;
69cf2d85 EC	108	unsigned long n;
	109
	110	aoe_failbuf(d, d->ip.buf);
1da177e4	111
69cf2d85 EC	112	rq = d->ip.rq;
69cf2d85 EC	113	if (rq == NULL)
896831f5	114	return;
69cf2d85 EC	115	while ((bio = d->ip.nxbio)) {
	116	clear_bit(BIO_UPTODATE, &bio->bi_flags);
	117	d->ip.nxbio = bio->bi_next;
	118	n = (unsigned long) rq->special;
	119	rq->special = (void *) --n;
1da177e4	120	}
69cf2d85 EC	121	if ((unsigned long) rq->special == 0)
69cf2d85 EC	122	aoe_end_request(d, rq, 0);
896831f5 EC	123	}
	124
	125	void
	126	aoedev_downdev(struct aoedev *d)
	127	{
	128	struct aoetgt t, tt, *te;
	129	struct frame *f;
	130	struct list_head head, pos, *nx;
69cf2d85	131	struct request *rq;
896831f5 EC	132	int i;
896831f5 EC	133
69cf2d85 EC	134	d->flags &= ~DEVFL_UP;
69cf2d85 EC	135
64a80f5a EC	136	/* clean out active buffers */
	137	for (i = 0; i < NFACTIVE; i++) {
	138	head = &d->factive[i];
	139	list_for_each_safe(pos, nx, head) {
	140	f = list_entry(pos, struct frame, head);
	141	list_del(pos);
	142	if (f->buf) {
	143	f->buf->nframesout--;
	144	aoe_failbuf(d, f->buf);
	145	}
	146	aoe_freetframe(f);
	147	}
	148	}
	149	/* reset window dressings */
896831f5 EC	150	tt = d->targets;
	151	te = tt + NTARGETS;
	152	for (; tt < te && (t = *tt); tt++) {
896831f5 EC	153	t->maxout = t->nframes;
	154	t->nout = 0;
	155	}
	156
69cf2d85 EC	157	/* clean out the in-process request (if any) */
69cf2d85 EC	158	aoe_failip(d);
68e0d42f	159	d->htgt = NULL;
1da177e4	160
69cf2d85 EC	161	/* fast fail all pending I/O */
	162	if (d->blkq) {
	163	while ((rq = blk_peek_request(d->blkq))) {
	164	blk_start_request(rq);
	165	aoe_end_request(d, rq, 1);
	166	}
1da177e4 LT	167	}
1da177e4 LT	168
1da177e4	169	if (d->gd)
80795aef	170	set_capacity(d->gd, 0);
1da177e4 LT	171	}
1da177e4 LT	172
262bf541 EC	173	static void
	174	aoedev_freedev(struct aoedev *d)
	175	{
	176	struct aoetgt t, e;
	177
5ad21a33	178	cancel_work_sync(&d->work);
262bf541 EC	179	if (d->gd) {
	180	aoedisk_rm_sysfs(d);
	181	del_gendisk(d->gd);
	182	put_disk(d->gd);
69cf2d85	183	blk_cleanup_queue(d->blkq);
262bf541 EC	184	}
	185	t = d->targets;
	186	e = t + NTARGETS;
	187	for (; t < e && *t; t++)
9bb237b6	188	freetgt(d, *t);
262bf541 EC	189	if (d->bufpool)
262bf541 EC	190	mempool_destroy(d->bufpool);
9bb237b6	191	skbpoolfree(d);
0c966214	192	minor_free(d->sysminor);
262bf541 EC	193	kfree(d);
	194	}
	195
	196	int
	197	aoedev_flush(const char __user *str, size_t cnt)
	198	{
	199	ulong flags;
	200	struct aoedev d, *dd;
	201	struct aoedev *rmd = NULL;
	202	char buf[16];
	203	int all = 0;
	204
	205	if (cnt >= 3) {
	206	if (cnt > sizeof buf)
	207	cnt = sizeof buf;
	208	if (copy_from_user(buf, str, cnt))
	209	return -EFAULT;
	210	all = !strncmp(buf, "all", 3);
	211	}
	212
262bf541 EC	213	spin_lock_irqsave(&devlist_lock, flags);
	214	dd = &devlist;
	215	while ((d = *dd)) {
	216	spin_lock(&d->lock);
	217	if ((!all && (d->flags & DEVFL_UP))
	218	\|\| (d->flags & (DEVFL_GDALLOC\|DEVFL_NEWSIZE))
69cf2d85 EC	219	\|\| d->nopen
69cf2d85 EC	220	\|\| d->ref) {
262bf541 EC	221	spin_unlock(&d->lock);
	222	dd = &d->next;
	223	continue;
	224	}
	225	*dd = d->next;
	226	aoedev_downdev(d);
	227	d->flags \|= DEVFL_TKILL;
	228	spin_unlock(&d->lock);
	229	d->next = rmd;
	230	rmd = d;
	231	}
	232	spin_unlock_irqrestore(&devlist_lock, flags);
	233	while ((d = rmd)) {
	234	rmd = d->next;
	235	del_timer_sync(&d->timer);
	236	aoedev_freedev(d); /* must be able to sleep */
	237	}
	238	return 0;
	239	}
	240
69cf2d85 EC	241	/* This has been confirmed to occur once with Tms=3*1000 due to the
	242	* driver changing link and not processing its transmit ring. The
	243	* problem is hard enough to solve by returning an error that I'm
	244	* still punting on "solving" this.
	245	*/
9bb237b6 EC	246	static void
	247	skbfree(struct sk_buff *skb)
	248	{
69cf2d85	249	enum { Sms = 250, Tms = 30 * 1000};
9bb237b6 EC	250	int i = Tms / Sms;
	251
	252	if (skb == NULL)
	253	return;
	254	while (atomic_read(&skb_shinfo(skb)->dataref) != 1 && i-- > 0)
	255	msleep(Sms);
94873111	256	if (i < 0) {
9bb237b6 EC	257	printk(KERN_ERR
	258	"aoe: %s holds ref: %s\n",
	259	skb->dev ? skb->dev->name : "netif",
	260	"cannot free skb -- memory leaked.");
	261	return;
	262	}
3d5b0605	263	skb->truesize -= skb->data_len;
9bb237b6 EC	264	skb_shinfo(skb)->nr_frags = skb->data_len = 0;
	265	skb_trim(skb, 0);
	266	dev_kfree_skb(skb);
	267	}
	268
	269	static void
	270	skbpoolfree(struct aoedev *d)
	271	{
e9bb8fb0	272	struct sk_buff skb, tmp;
9bb237b6	273
e9bb8fb0	274	skb_queue_walk_safe(&d->skbpool, skb, tmp)
9bb237b6	275	skbfree(skb);
e9bb8fb0 DM	276
e9bb8fb0 DM	277	__skb_queue_head_init(&d->skbpool);
9bb237b6 EC	278	}
9bb237b6 EC	279
0c966214	280	/* find it or allocate it */
1da177e4	281	struct aoedev *
0c966214	282	aoedev_by_aoeaddr(ulong maj, int min, int do_alloc)
1da177e4 LT	283	{
1da177e4 LT	284	struct aoedev *d;
64a80f5a	285	int i;
1da177e4	286	ulong flags;
0c966214	287	ulong sysminor;
1da177e4 LT	288
	289	spin_lock_irqsave(&devlist_lock, flags);
	290
	291	for (d=devlist; d; d=d->next)
0c966214	292	if (d->aoemajor == maj && d->aoeminor == min) {
69cf2d85	293	d->ref++;
1da177e4	294	break;
69cf2d85	295	}
0c966214	296	if (d \|\| !do_alloc \|\| minor_get(&sysminor) < 0)
68e0d42f EC	297	goto out;
	298	d = kcalloc(1, sizeof *d, GFP_ATOMIC);
	299	if (!d)
	300	goto out;
	301	INIT_WORK(&d->work, aoecmd_sleepwork);
	302	spin_lock_init(&d->lock);
e9bb8fb0	303	skb_queue_head_init(&d->skbpool);
68e0d42f EC	304	init_timer(&d->timer);
	305	d->timer.data = (ulong) d;
	306	d->timer.function = dummy_timer;
	307	d->timer.expires = jiffies + HZ;
	308	add_timer(&d->timer);
	309	d->bufpool = NULL; /* defer to aoeblk_gdalloc */
	310	d->tgt = d->targets;
69cf2d85	311	d->ref = 1;
64a80f5a EC	312	for (i = 0; i < NFACTIVE; i++)
64a80f5a EC	313	INIT_LIST_HEAD(&d->factive[i]);
68e0d42f	314	d->sysminor = sysminor;
0c966214 EC	315	d->aoemajor = maj;
0c966214 EC	316	d->aoeminor = min;
68e0d42f EC	317	d->mintimer = MINTIMER;
	318	d->next = devlist;
	319	devlist = d;
	320	out:
3ae1c24e	321	spin_unlock_irqrestore(&devlist_lock, flags);
1da177e4 LT	322	return d;
	323	}
	324
	325	static void
9bb237b6	326	freetgt(struct aoedev d, struct aoetgt t)
1da177e4	327	{
896831f5 EC	328	struct frame *f;
896831f5 EC	329	struct list_head pos, nx, *head;
1b86fda9 EC	330	struct aoeif *ifp;
	331
	332	for (ifp = t->ifs; ifp < &t->ifs[NAOEIFS]; ++ifp) {
	333	if (!ifp->nd)
	334	break;
	335	dev_put(ifp->nd);
	336	}
e407a7f6	337
896831f5 EC	338	head = &t->ffree;
	339	list_for_each_safe(pos, nx, head) {
	340	list_del(pos);
	341	f = list_entry(pos, struct frame, head);
9bb237b6	342	skbfree(f->skb);
896831f5 EC	343	kfree(f);
896831f5 EC	344	}
68e0d42f EC	345	kfree(t);
	346	}
	347
1da177e4 LT	348	void
	349	aoedev_exit(void)
	350	{
	351	struct aoedev *d;
	352	ulong flags;
	353
69cf2d85	354	aoe_flush_iocq();
1da177e4 LT	355	while ((d = devlist)) {
	356	devlist = d->next;
	357
	358	spin_lock_irqsave(&d->lock, flags);
	359	aoedev_downdev(d);
3ae1c24e	360	d->flags \|= DEVFL_TKILL;
1da177e4 LT	361	spin_unlock_irqrestore(&d->lock, flags);
	362
	363	del_timer_sync(&d->timer);
	364	aoedev_freedev(d);
	365	}
	366	}
	367
	368	int __init
	369	aoedev_init(void)
	370	{
1da177e4 LT	371	return 0;
1da177e4 LT	372	}