Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * cn_queue.c |
| 3 | * |
| 4 | * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru> |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/list.h> |
| 26 | #include <linux/workqueue.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/skbuff.h> |
| 30 | #include <linux/suspend.h> |
| 31 | #include <linux/connector.h> |
| 32 | #include <linux/delay.h> |
| 33 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame^] | 34 | void cn_queue_wrapper(struct work_struct *work) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 35 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame^] | 36 | struct cn_callback_entry *cbq = |
| 37 | container_of(work, struct cn_callback_entry, work.work); |
| 38 | struct cn_callback_data *d = &cbq->data; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 39 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 40 | d->callback(d->callback_priv); |
| 41 | |
| 42 | d->destruct_data(d->ddata); |
| 43 | d->ddata = NULL; |
| 44 | |
| 45 | kfree(d->free); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 46 | } |
| 47 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 48 | static struct cn_callback_entry *cn_queue_alloc_callback_entry(char *name, struct cb_id *id, void (*callback)(void *)) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 49 | { |
| 50 | struct cn_callback_entry *cbq; |
| 51 | |
| 52 | cbq = kzalloc(sizeof(*cbq), GFP_KERNEL); |
| 53 | if (!cbq) { |
| 54 | printk(KERN_ERR "Failed to create new callback queue.\n"); |
| 55 | return NULL; |
| 56 | } |
| 57 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 58 | snprintf(cbq->id.name, sizeof(cbq->id.name), "%s", name); |
| 59 | memcpy(&cbq->id.id, id, sizeof(struct cb_id)); |
| 60 | cbq->data.callback = callback; |
| 61 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame^] | 62 | INIT_DELAYED_WORK(&cbq->work, &cn_queue_wrapper); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 63 | return cbq; |
| 64 | } |
| 65 | |
| 66 | static void cn_queue_free_callback(struct cn_callback_entry *cbq) |
| 67 | { |
| 68 | cancel_delayed_work(&cbq->work); |
| 69 | flush_workqueue(cbq->pdev->cn_queue); |
| 70 | |
| 71 | kfree(cbq); |
| 72 | } |
| 73 | |
| 74 | int cn_cb_equal(struct cb_id *i1, struct cb_id *i2) |
| 75 | { |
| 76 | return ((i1->idx == i2->idx) && (i1->val == i2->val)); |
| 77 | } |
| 78 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 79 | int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *)) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 80 | { |
| 81 | struct cn_callback_entry *cbq, *__cbq; |
| 82 | int found = 0; |
| 83 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 84 | cbq = cn_queue_alloc_callback_entry(name, id, callback); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 85 | if (!cbq) |
| 86 | return -ENOMEM; |
| 87 | |
| 88 | atomic_inc(&dev->refcnt); |
| 89 | cbq->pdev = dev; |
| 90 | |
| 91 | spin_lock_bh(&dev->queue_lock); |
| 92 | list_for_each_entry(__cbq, &dev->queue_list, callback_entry) { |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 93 | if (cn_cb_equal(&__cbq->id.id, id)) { |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 94 | found = 1; |
| 95 | break; |
| 96 | } |
| 97 | } |
| 98 | if (!found) |
| 99 | list_add_tail(&cbq->callback_entry, &dev->queue_list); |
| 100 | spin_unlock_bh(&dev->queue_lock); |
| 101 | |
| 102 | if (found) { |
| 103 | atomic_dec(&dev->refcnt); |
| 104 | cn_queue_free_callback(cbq); |
| 105 | return -EINVAL; |
| 106 | } |
| 107 | |
| 108 | cbq->nls = dev->nls; |
| 109 | cbq->seq = 0; |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 110 | cbq->group = cbq->id.id.idx; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id) |
| 116 | { |
| 117 | struct cn_callback_entry *cbq, *n; |
| 118 | int found = 0; |
| 119 | |
| 120 | spin_lock_bh(&dev->queue_lock); |
| 121 | list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) { |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 122 | if (cn_cb_equal(&cbq->id.id, id)) { |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 123 | list_del(&cbq->callback_entry); |
| 124 | found = 1; |
| 125 | break; |
| 126 | } |
| 127 | } |
| 128 | spin_unlock_bh(&dev->queue_lock); |
| 129 | |
| 130 | if (found) { |
| 131 | cn_queue_free_callback(cbq); |
Andreas Schwab | cec6f7f | 2006-06-05 21:21:57 -0700 | [diff] [blame] | 132 | atomic_dec(&dev->refcnt); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 133 | } |
| 134 | } |
| 135 | |
| 136 | struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *nls) |
| 137 | { |
| 138 | struct cn_queue_dev *dev; |
| 139 | |
| 140 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 141 | if (!dev) |
| 142 | return NULL; |
| 143 | |
| 144 | snprintf(dev->name, sizeof(dev->name), "%s", name); |
| 145 | atomic_set(&dev->refcnt, 0); |
| 146 | INIT_LIST_HEAD(&dev->queue_list); |
| 147 | spin_lock_init(&dev->queue_lock); |
| 148 | |
| 149 | dev->nls = nls; |
| 150 | dev->netlink_groups = 0; |
| 151 | |
| 152 | dev->cn_queue = create_workqueue(dev->name); |
| 153 | if (!dev->cn_queue) { |
| 154 | kfree(dev); |
| 155 | return NULL; |
| 156 | } |
| 157 | |
| 158 | return dev; |
| 159 | } |
| 160 | |
| 161 | void cn_queue_free_dev(struct cn_queue_dev *dev) |
| 162 | { |
| 163 | struct cn_callback_entry *cbq, *n; |
| 164 | |
| 165 | flush_workqueue(dev->cn_queue); |
| 166 | destroy_workqueue(dev->cn_queue); |
| 167 | |
| 168 | spin_lock_bh(&dev->queue_lock); |
| 169 | list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) |
| 170 | list_del(&cbq->callback_entry); |
| 171 | spin_unlock_bh(&dev->queue_lock); |
| 172 | |
| 173 | while (atomic_read(&dev->refcnt)) { |
| 174 | printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n", |
| 175 | dev->name, atomic_read(&dev->refcnt)); |
| 176 | msleep(1000); |
| 177 | } |
| 178 | |
| 179 | kfree(dev); |
| 180 | dev = NULL; |
| 181 | } |