net/ncsi/ncsi-manage.c - kernel/msm-5.4 - Gitiles

 /*
  * Copyright Gavin Shan, IBM Corporation 2016.
  *
  * 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; either version 2 of the License, or
  * (at your option) any later version.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <linux/netlink.h>

 #include <net/ncsi.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>

 #include "internal.h"

 LIST_HEAD(ncsi_dev_list);
 DEFINE_SPINLOCK(ncsi_dev_lock);

 static inline int ncsi_filter_size(int table)
 {
 	int sizes[] = { 2, 6, 6, 6 };

 	BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX);
 	if (table < NCSI_FILTER_BASE || table >= NCSI_FILTER_MAX)
 		return -EINVAL;

 	return sizes[table];
 }

 int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
 {
 	struct ncsi_channel_filter *ncf;
 	void *bitmap;
 	int index, size;
 	unsigned long flags;

 	ncf = nc->filters[table];
 	if (!ncf)
 		return -ENXIO;

 	size = ncsi_filter_size(table);
 	if (size < 0)
 		return size;

 	spin_lock_irqsave(&nc->lock, flags);
 	bitmap = (void *)&ncf->bitmap;
 	index = -1;
 	while ((index = find_next_bit(bitmap, ncf->total, index + 1))
 	       < ncf->total) {
 		if (!memcmp(ncf->data + size * index, data, size)) {
 			spin_unlock_irqrestore(&nc->lock, flags);
 			return index;
 		}
 	}
 	spin_unlock_irqrestore(&nc->lock, flags);

 	return -ENOENT;
 }

 int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data)
 {
 	struct ncsi_channel_filter *ncf;
 	int index, size;
 	void *bitmap;
 	unsigned long flags;

 	size = ncsi_filter_size(table);
 	if (size < 0)
 		return size;

 	index = ncsi_find_filter(nc, table, data);
 	if (index >= 0)
 		return index;

 	ncf = nc->filters[table];
 	if (!ncf)
 		return -ENODEV;

 	spin_lock_irqsave(&nc->lock, flags);
 	bitmap = (void *)&ncf->bitmap;
 	do {
 		index = find_next_zero_bit(bitmap, ncf->total, 0);
 		if (index >= ncf->total) {
 			spin_unlock_irqrestore(&nc->lock, flags);
 			return -ENOSPC;
 		}
 	} while (test_and_set_bit(index, bitmap));

 	memcpy(ncf->data + size * index, data, size);
 	spin_unlock_irqrestore(&nc->lock, flags);

 	return index;
 }

 int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
 {
 	struct ncsi_channel_filter *ncf;
 	int size;
 	void *bitmap;
 	unsigned long flags;

 	size = ncsi_filter_size(table);
 	if (size < 0)
 		return size;

 	ncf = nc->filters[table];
 	if (!ncf || index >= ncf->total)
 		return -ENODEV;

 	spin_lock_irqsave(&nc->lock, flags);
 	bitmap = (void *)&ncf->bitmap;
 	if (test_and_clear_bit(index, bitmap))
 		memset(ncf->data + size * index, 0, size);
 	spin_unlock_irqrestore(&nc->lock, flags);

 	return 0;
 }

 struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
 				       unsigned char id)
 {
 	struct ncsi_channel *nc;

 	NCSI_FOR_EACH_CHANNEL(np, nc) {
 		if (nc->id == id)
 			return nc;
 	}

 	return NULL;
 }

 struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
 {
 	struct ncsi_channel *nc, *tmp;
 	int index;
 	unsigned long flags;

 	nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
 	if (!nc)
 		return NULL;

 	nc->id = id;
 	nc->package = np;
 	nc->state = NCSI_CHANNEL_INACTIVE;
 	spin_lock_init(&nc->lock);
 	for (index = 0; index < NCSI_CAP_MAX; index++)
 		nc->caps[index].index = index;
 	for (index = 0; index < NCSI_MODE_MAX; index++)
 		nc->modes[index].index = index;

 	spin_lock_irqsave(&np->lock, flags);
 	tmp = ncsi_find_channel(np, id);
 	if (tmp) {
 		spin_unlock_irqrestore(&np->lock, flags);
 		kfree(nc);
 		return tmp;
 	}

 	list_add_tail_rcu(&nc->node, &np->channels);
 	np->channel_num++;
 	spin_unlock_irqrestore(&np->lock, flags);

 	return nc;
 }

 static void ncsi_remove_channel(struct ncsi_channel *nc)
 {
 	struct ncsi_package *np = nc->package;
 	struct ncsi_channel_filter *ncf;
 	unsigned long flags;
 	int i;

 	/* Release filters */
 	spin_lock_irqsave(&nc->lock, flags);
 	for (i = 0; i < NCSI_FILTER_MAX; i++) {
 		ncf = nc->filters[i];
 		if (!ncf)
 			continue;

 		nc->filters[i] = NULL;
 		kfree(ncf);
 	}

 	nc->state = NCSI_CHANNEL_INACTIVE;
 	spin_unlock_irqrestore(&nc->lock, flags);

 	/* Remove and free channel */
 	spin_lock_irqsave(&np->lock, flags);
 	list_del_rcu(&nc->node);
 	np->channel_num--;
 	spin_unlock_irqrestore(&np->lock, flags);

 	kfree(nc);
 }

 struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
 				       unsigned char id)
 {
 	struct ncsi_package *np;

 	NCSI_FOR_EACH_PACKAGE(ndp, np) {
 		if (np->id == id)
 			return np;
 	}

 	return NULL;
 }

 struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
 				      unsigned char id)
 {
 	struct ncsi_package *np, *tmp;
 	unsigned long flags;

 	np = kzalloc(sizeof(*np), GFP_ATOMIC);
 	if (!np)
 		return NULL;

 	np->id = id;
 	np->ndp = ndp;
 	spin_lock_init(&np->lock);
 	INIT_LIST_HEAD(&np->channels);

 	spin_lock_irqsave(&ndp->lock, flags);
 	tmp = ncsi_find_package(ndp, id);
 	if (tmp) {
 		spin_unlock_irqrestore(&ndp->lock, flags);
 		kfree(np);
 		return tmp;
 	}

 	list_add_tail_rcu(&np->node, &ndp->packages);
 	ndp->package_num++;
 	spin_unlock_irqrestore(&ndp->lock, flags);

 	return np;
 }

 void ncsi_remove_package(struct ncsi_package *np)
 {
 	struct ncsi_dev_priv *ndp = np->ndp;
 	struct ncsi_channel *nc, *tmp;
 	unsigned long flags;

 	/* Release all child channels */
 	list_for_each_entry_safe(nc, tmp, &np->channels, node)
 		ncsi_remove_channel(nc);

 	/* Remove and free package */
 	spin_lock_irqsave(&ndp->lock, flags);
 	list_del_rcu(&np->node);
 	ndp->package_num--;
 	spin_unlock_irqrestore(&ndp->lock, flags);

 	kfree(np);
 }

 void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
 				   unsigned char id,
 				   struct ncsi_package **np,
 				   struct ncsi_channel **nc)
 {
 	struct ncsi_package *p;
 	struct ncsi_channel *c;

 	p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
 	c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;

 	if (np)
 		*np = p;
 	if (nc)
 		*nc = c;
 }

 /* For two consecutive NCSI commands, the packet IDs shouldn't
  * be same. Otherwise, the bogus response might be replied. So
  * the available IDs are allocated in round-robin fashion.
  */
 struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven)
 {
 	struct ncsi_request *nr = NULL;
 	int i, limit = ARRAY_SIZE(ndp->requests);
 	unsigned long flags;

 	/* Check if there is one available request until the ceiling */
 	spin_lock_irqsave(&ndp->lock, flags);
 	for (i = ndp->request_id; !nr && i < limit; i++) {
 		if (ndp->requests[i].used)
 			continue;

 		nr = &ndp->requests[i];
 		nr->used = true;
 		nr->driven = driven;
 		if (++ndp->request_id >= limit)
 			ndp->request_id = 0;
 	}

 	/* Fail back to check from the starting cursor */
 	for (i = 0; !nr && i < ndp->request_id; i++) {
 		if (ndp->requests[i].used)
 			continue;

 		nr = &ndp->requests[i];
 		nr->used = true;
 		nr->driven = driven;
 		if (++ndp->request_id >= limit)
 			ndp->request_id = 0;
 	}
 	spin_unlock_irqrestore(&ndp->lock, flags);

 	return nr;
 }

 void ncsi_free_request(struct ncsi_request *nr)
 {
 	struct ncsi_dev_priv *ndp = nr->ndp;
 	struct sk_buff *cmd, *rsp;
 	unsigned long flags;

 	if (nr->enabled) {
 		nr->enabled = false;
 		del_timer_sync(&nr->timer);
 	}

 	spin_lock_irqsave(&ndp->lock, flags);
 	cmd = nr->cmd;
 	rsp = nr->rsp;
 	nr->cmd = NULL;
 	nr->rsp = NULL;
 	nr->used = false;
 	spin_unlock_irqrestore(&ndp->lock, flags);

 	/* Release command and response */
 	consume_skb(cmd);
 	consume_skb(rsp);
 }

 struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
 {
 	struct ncsi_dev_priv *ndp;

 	NCSI_FOR_EACH_DEV(ndp) {
 		if (ndp->ndev.dev == dev)
 			return &ndp->ndev;
 	}

 	return NULL;
 }

 static void ncsi_request_timeout(unsigned long data)
 {
 	struct ncsi_request *nr = (struct ncsi_request *)data;
 	struct ncsi_dev_priv *ndp = nr->ndp;
 	unsigned long flags;

 	/* If the request already had associated response,
 	 * let the response handler to release it.
 	 */
 	spin_lock_irqsave(&ndp->lock, flags);
 	nr->enabled = false;
 	if (nr->rsp || !nr->cmd) {
 		spin_unlock_irqrestore(&ndp->lock, flags);
 		return;
 	}
 	spin_unlock_irqrestore(&ndp->lock, flags);

 	/* Release the request */
 	ncsi_free_request(nr);
 }

 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
 				   void (*handler)(struct ncsi_dev *ndev))
 {
 	struct ncsi_dev_priv *ndp;
 	struct ncsi_dev *nd;
 	unsigned long flags;
 	int i;

 	/* Check if the device has been registered or not */
 	nd = ncsi_find_dev(dev);
 	if (nd)
 		return nd;

 	/* Create NCSI device */
 	ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
 	if (!ndp)
 		return NULL;

 	nd = &ndp->ndev;
 	nd->state = ncsi_dev_state_registered;
 	nd->dev = dev;
 	nd->handler = handler;

 	/* Initialize private NCSI device */
 	spin_lock_init(&ndp->lock);
 	INIT_LIST_HEAD(&ndp->packages);
 	ndp->request_id = 0;
 	for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
 		ndp->requests[i].id = i;
 		ndp->requests[i].ndp = ndp;
 		setup_timer(&ndp->requests[i].timer,
 			    ncsi_request_timeout,
 			    (unsigned long)&ndp->requests[i]);
 	}

 	spin_lock_irqsave(&ncsi_dev_lock, flags);
 	list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
 	spin_unlock_irqrestore(&ncsi_dev_lock, flags);

 	return nd;
 }
 EXPORT_SYMBOL_GPL(ncsi_register_dev);

 void ncsi_unregister_dev(struct ncsi_dev *nd)
 {
 	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
 	struct ncsi_package *np, *tmp;
 	unsigned long flags;

 	list_for_each_entry_safe(np, tmp, &ndp->packages, node)
 		ncsi_remove_package(np);

 	spin_lock_irqsave(&ncsi_dev_lock, flags);
 	list_del_rcu(&ndp->node);
 	spin_unlock_irqrestore(&ncsi_dev_lock, flags);

 	kfree(ndp);
 }
 EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
	/*
	* Copyright Gavin Shan, IBM Corporation 2016.
	*
	* 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; either version 2 of the License, or
	* (at your option) any later version.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/netdevice.h>
	#include <linux/skbuff.h>
	#include <linux/netlink.h>

	#include <net/ncsi.h>
	#include <net/net_namespace.h>
	#include <net/sock.h>

	#include "internal.h"

	LIST_HEAD(ncsi_dev_list);
	DEFINE_SPINLOCK(ncsi_dev_lock);

	static inline int ncsi_filter_size(int table)
	{
	int sizes[] = { 2, 6, 6, 6 };

	BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX);
	if (table < NCSI_FILTER_BASE \|\| table >= NCSI_FILTER_MAX)
	return -EINVAL;

	return sizes[table];
	}

	int ncsi_find_filter(struct ncsi_channel nc, int table, void data)
	{
	struct ncsi_channel_filter *ncf;
	void *bitmap;
	int index, size;
	unsigned long flags;

	ncf = nc->filters[table];
	if (!ncf)
	return -ENXIO;

	size = ncsi_filter_size(table);
	if (size < 0)
	return size;

	spin_lock_irqsave(&nc->lock, flags);
	bitmap = (void *)&ncf->bitmap;
	index = -1;
	while ((index = find_next_bit(bitmap, ncf->total, index + 1))
	< ncf->total) {
	if (!memcmp(ncf->data + size * index, data, size)) {
	spin_unlock_irqrestore(&nc->lock, flags);
	return index;
	}
	}
	spin_unlock_irqrestore(&nc->lock, flags);

	return -ENOENT;
	}

	int ncsi_add_filter(struct ncsi_channel nc, int table, void data)
	{
	struct ncsi_channel_filter *ncf;
	int index, size;
	void *bitmap;
	unsigned long flags;

	size = ncsi_filter_size(table);
	if (size < 0)
	return size;

	index = ncsi_find_filter(nc, table, data);
	if (index >= 0)
	return index;

	ncf = nc->filters[table];
	if (!ncf)
	return -ENODEV;

	spin_lock_irqsave(&nc->lock, flags);
	bitmap = (void *)&ncf->bitmap;
	do {
	index = find_next_zero_bit(bitmap, ncf->total, 0);
	if (index >= ncf->total) {
	spin_unlock_irqrestore(&nc->lock, flags);
	return -ENOSPC;
	}
	} while (test_and_set_bit(index, bitmap));

	memcpy(ncf->data + size * index, data, size);
	spin_unlock_irqrestore(&nc->lock, flags);

	return index;
	}

	int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
	{
	struct ncsi_channel_filter *ncf;
	int size;
	void *bitmap;
	unsigned long flags;

	size = ncsi_filter_size(table);
	if (size < 0)
	return size;

	ncf = nc->filters[table];
	if (!ncf \|\| index >= ncf->total)
	return -ENODEV;

	spin_lock_irqsave(&nc->lock, flags);
	bitmap = (void *)&ncf->bitmap;
	if (test_and_clear_bit(index, bitmap))
	memset(ncf->data + size * index, 0, size);
	spin_unlock_irqrestore(&nc->lock, flags);

	return 0;
	}

	struct ncsi_channel ncsi_find_channel(struct ncsi_package np,
	unsigned char id)
	{
	struct ncsi_channel *nc;

	NCSI_FOR_EACH_CHANNEL(np, nc) {
	if (nc->id == id)
	return nc;
	}

	return NULL;
	}

	struct ncsi_channel ncsi_add_channel(struct ncsi_package np, unsigned char id)
	{
	struct ncsi_channel nc, tmp;
	int index;
	unsigned long flags;

	nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
	if (!nc)
	return NULL;

	nc->id = id;
	nc->package = np;
	nc->state = NCSI_CHANNEL_INACTIVE;
	spin_lock_init(&nc->lock);
	for (index = 0; index < NCSI_CAP_MAX; index++)
	nc->caps[index].index = index;
	for (index = 0; index < NCSI_MODE_MAX; index++)
	nc->modes[index].index = index;

	spin_lock_irqsave(&np->lock, flags);
	tmp = ncsi_find_channel(np, id);
	if (tmp) {
	spin_unlock_irqrestore(&np->lock, flags);
	kfree(nc);
	return tmp;
	}

	list_add_tail_rcu(&nc->node, &np->channels);
	np->channel_num++;
	spin_unlock_irqrestore(&np->lock, flags);

	return nc;
	}

	static void ncsi_remove_channel(struct ncsi_channel *nc)
	{
	struct ncsi_package *np = nc->package;
	struct ncsi_channel_filter *ncf;
	unsigned long flags;
	int i;

	/* Release filters */
	spin_lock_irqsave(&nc->lock, flags);
	for (i = 0; i < NCSI_FILTER_MAX; i++) {
	ncf = nc->filters[i];
	if (!ncf)
	continue;

	nc->filters[i] = NULL;
	kfree(ncf);
	}

	nc->state = NCSI_CHANNEL_INACTIVE;
	spin_unlock_irqrestore(&nc->lock, flags);

	/* Remove and free channel */
	spin_lock_irqsave(&np->lock, flags);
	list_del_rcu(&nc->node);
	np->channel_num--;
	spin_unlock_irqrestore(&np->lock, flags);

	kfree(nc);
	}

	struct ncsi_package ncsi_find_package(struct ncsi_dev_priv ndp,
	unsigned char id)
	{
	struct ncsi_package *np;

	NCSI_FOR_EACH_PACKAGE(ndp, np) {
	if (np->id == id)
	return np;
	}

	return NULL;
	}

	struct ncsi_package ncsi_add_package(struct ncsi_dev_priv ndp,
	unsigned char id)
	{
	struct ncsi_package np, tmp;
	unsigned long flags;

	np = kzalloc(sizeof(*np), GFP_ATOMIC);
	if (!np)
	return NULL;

	np->id = id;
	np->ndp = ndp;
	spin_lock_init(&np->lock);
	INIT_LIST_HEAD(&np->channels);

	spin_lock_irqsave(&ndp->lock, flags);
	tmp = ncsi_find_package(ndp, id);
	if (tmp) {
	spin_unlock_irqrestore(&ndp->lock, flags);
	kfree(np);
	return tmp;
	}

	list_add_tail_rcu(&np->node, &ndp->packages);
	ndp->package_num++;
	spin_unlock_irqrestore(&ndp->lock, flags);

	return np;
	}

	void ncsi_remove_package(struct ncsi_package *np)
	{
	struct ncsi_dev_priv *ndp = np->ndp;
	struct ncsi_channel nc, tmp;
	unsigned long flags;

	/* Release all child channels */
	list_for_each_entry_safe(nc, tmp, &np->channels, node)
	ncsi_remove_channel(nc);

	/* Remove and free package */
	spin_lock_irqsave(&ndp->lock, flags);
	list_del_rcu(&np->node);
	ndp->package_num--;
	spin_unlock_irqrestore(&ndp->lock, flags);

	kfree(np);
	}

	void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
	unsigned char id,
	struct ncsi_package **np,
	struct ncsi_channel **nc)
	{
	struct ncsi_package *p;
	struct ncsi_channel *c;

	p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
	c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;

	if (np)
	*np = p;
	if (nc)
	*nc = c;
	}

	/* For two consecutive NCSI commands, the packet IDs shouldn't
	* be same. Otherwise, the bogus response might be replied. So
	* the available IDs are allocated in round-robin fashion.
	*/
	struct ncsi_request ncsi_alloc_request(struct ncsi_dev_priv ndp, bool driven)
	{
	struct ncsi_request *nr = NULL;
	int i, limit = ARRAY_SIZE(ndp->requests);
	unsigned long flags;

	/* Check if there is one available request until the ceiling */
	spin_lock_irqsave(&ndp->lock, flags);
	for (i = ndp->request_id; !nr && i < limit; i++) {
	if (ndp->requests[i].used)
	continue;

	nr = &ndp->requests[i];
	nr->used = true;
	nr->driven = driven;
	if (++ndp->request_id >= limit)
	ndp->request_id = 0;
	}

	/* Fail back to check from the starting cursor */
	for (i = 0; !nr && i < ndp->request_id; i++) {
	if (ndp->requests[i].used)
	continue;

	nr = &ndp->requests[i];
	nr->used = true;
	nr->driven = driven;
	if (++ndp->request_id >= limit)
	ndp->request_id = 0;
	}
	spin_unlock_irqrestore(&ndp->lock, flags);

	return nr;
	}

	void ncsi_free_request(struct ncsi_request *nr)
	{
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct sk_buff cmd, rsp;
	unsigned long flags;

	if (nr->enabled) {
	nr->enabled = false;
	del_timer_sync(&nr->timer);
	}

	spin_lock_irqsave(&ndp->lock, flags);
	cmd = nr->cmd;
	rsp = nr->rsp;
	nr->cmd = NULL;
	nr->rsp = NULL;
	nr->used = false;
	spin_unlock_irqrestore(&ndp->lock, flags);

	/* Release command and response */
	consume_skb(cmd);
	consume_skb(rsp);
	}

	struct ncsi_dev ncsi_find_dev(struct net_device dev)
	{
	struct ncsi_dev_priv *ndp;

	NCSI_FOR_EACH_DEV(ndp) {
	if (ndp->ndev.dev == dev)
	return &ndp->ndev;
	}

	return NULL;
	}

	static void ncsi_request_timeout(unsigned long data)
	{
	struct ncsi_request nr = (struct ncsi_request )data;
	struct ncsi_dev_priv *ndp = nr->ndp;
	unsigned long flags;

	/* If the request already had associated response,
	* let the response handler to release it.
	*/
	spin_lock_irqsave(&ndp->lock, flags);
	nr->enabled = false;
	if (nr->rsp \|\| !nr->cmd) {
	spin_unlock_irqrestore(&ndp->lock, flags);
	return;
	}
	spin_unlock_irqrestore(&ndp->lock, flags);

	/* Release the request */
	ncsi_free_request(nr);
	}

	struct ncsi_dev ncsi_register_dev(struct net_device dev,
	void (handler)(struct ncsi_dev ndev))
	{
	struct ncsi_dev_priv *ndp;
	struct ncsi_dev *nd;
	unsigned long flags;
	int i;

	/* Check if the device has been registered or not */
	nd = ncsi_find_dev(dev);
	if (nd)
	return nd;

	/* Create NCSI device */
	ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
	if (!ndp)
	return NULL;

	nd = &ndp->ndev;
	nd->state = ncsi_dev_state_registered;
	nd->dev = dev;
	nd->handler = handler;

	/* Initialize private NCSI device */
	spin_lock_init(&ndp->lock);
	INIT_LIST_HEAD(&ndp->packages);
	ndp->request_id = 0;
	for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
	ndp->requests[i].id = i;
	ndp->requests[i].ndp = ndp;
	setup_timer(&ndp->requests[i].timer,
	ncsi_request_timeout,
	(unsigned long)&ndp->requests[i]);
	}

	spin_lock_irqsave(&ncsi_dev_lock, flags);
	list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
	spin_unlock_irqrestore(&ncsi_dev_lock, flags);

	return nd;
	}
	EXPORT_SYMBOL_GPL(ncsi_register_dev);

	void ncsi_unregister_dev(struct ncsi_dev *nd)
	{
	struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
	struct ncsi_package np, tmp;
	unsigned long flags;

	list_for_each_entry_safe(np, tmp, &ndp->packages, node)
	ncsi_remove_package(np);

	spin_lock_irqsave(&ncsi_dev_lock, flags);
	list_del_rcu(&ndp->node);
	spin_unlock_irqrestore(&ncsi_dev_lock, flags);

	kfree(ndp);
	}
	EXPORT_SYMBOL_GPL(ncsi_unregister_dev);