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7672d0b5 EP |
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 | ||
acd042bb | 34 | void cn_queue_wrapper(void *data) |
7672d0b5 | 35 | { |
acd042bb | 36 | struct cn_callback_data *d = data; |
7672d0b5 | 37 | |
acd042bb EP |
38 | d->callback(d->callback_priv); |
39 | ||
40 | d->destruct_data(d->ddata); | |
41 | d->ddata = NULL; | |
42 | ||
43 | kfree(d->free); | |
7672d0b5 EP |
44 | } |
45 | ||
acd042bb | 46 | static struct cn_callback_entry *cn_queue_alloc_callback_entry(char *name, struct cb_id *id, void (*callback)(void *)) |
7672d0b5 EP |
47 | { |
48 | struct cn_callback_entry *cbq; | |
49 | ||
50 | cbq = kzalloc(sizeof(*cbq), GFP_KERNEL); | |
51 | if (!cbq) { | |
52 | printk(KERN_ERR "Failed to create new callback queue.\n"); | |
53 | return NULL; | |
54 | } | |
55 | ||
acd042bb EP |
56 | snprintf(cbq->id.name, sizeof(cbq->id.name), "%s", name); |
57 | memcpy(&cbq->id.id, id, sizeof(struct cb_id)); | |
58 | cbq->data.callback = callback; | |
59 | ||
60 | INIT_WORK(&cbq->work, &cn_queue_wrapper, &cbq->data); | |
7672d0b5 EP |
61 | return cbq; |
62 | } | |
63 | ||
64 | static void cn_queue_free_callback(struct cn_callback_entry *cbq) | |
65 | { | |
66 | cancel_delayed_work(&cbq->work); | |
67 | flush_workqueue(cbq->pdev->cn_queue); | |
68 | ||
69 | kfree(cbq); | |
70 | } | |
71 | ||
72 | int cn_cb_equal(struct cb_id *i1, struct cb_id *i2) | |
73 | { | |
74 | return ((i1->idx == i2->idx) && (i1->val == i2->val)); | |
75 | } | |
76 | ||
acd042bb | 77 | int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *)) |
7672d0b5 EP |
78 | { |
79 | struct cn_callback_entry *cbq, *__cbq; | |
80 | int found = 0; | |
81 | ||
acd042bb | 82 | cbq = cn_queue_alloc_callback_entry(name, id, callback); |
7672d0b5 EP |
83 | if (!cbq) |
84 | return -ENOMEM; | |
85 | ||
86 | atomic_inc(&dev->refcnt); | |
87 | cbq->pdev = dev; | |
88 | ||
89 | spin_lock_bh(&dev->queue_lock); | |
90 | list_for_each_entry(__cbq, &dev->queue_list, callback_entry) { | |
acd042bb | 91 | if (cn_cb_equal(&__cbq->id.id, id)) { |
7672d0b5 EP |
92 | found = 1; |
93 | break; | |
94 | } | |
95 | } | |
96 | if (!found) | |
97 | list_add_tail(&cbq->callback_entry, &dev->queue_list); | |
98 | spin_unlock_bh(&dev->queue_lock); | |
99 | ||
100 | if (found) { | |
101 | atomic_dec(&dev->refcnt); | |
102 | cn_queue_free_callback(cbq); | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | cbq->nls = dev->nls; | |
107 | cbq->seq = 0; | |
acd042bb | 108 | cbq->group = cbq->id.id.idx; |
7672d0b5 EP |
109 | |
110 | return 0; | |
111 | } | |
112 | ||
113 | void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id) | |
114 | { | |
115 | struct cn_callback_entry *cbq, *n; | |
116 | int found = 0; | |
117 | ||
118 | spin_lock_bh(&dev->queue_lock); | |
119 | list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) { | |
acd042bb | 120 | if (cn_cb_equal(&cbq->id.id, id)) { |
7672d0b5 EP |
121 | list_del(&cbq->callback_entry); |
122 | found = 1; | |
123 | break; | |
124 | } | |
125 | } | |
126 | spin_unlock_bh(&dev->queue_lock); | |
127 | ||
128 | if (found) { | |
129 | cn_queue_free_callback(cbq); | |
cec6f7f3 | 130 | atomic_dec(&dev->refcnt); |
7672d0b5 EP |
131 | } |
132 | } | |
133 | ||
134 | struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *nls) | |
135 | { | |
136 | struct cn_queue_dev *dev; | |
137 | ||
138 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
139 | if (!dev) | |
140 | return NULL; | |
141 | ||
142 | snprintf(dev->name, sizeof(dev->name), "%s", name); | |
143 | atomic_set(&dev->refcnt, 0); | |
144 | INIT_LIST_HEAD(&dev->queue_list); | |
145 | spin_lock_init(&dev->queue_lock); | |
146 | ||
147 | dev->nls = nls; | |
148 | dev->netlink_groups = 0; | |
149 | ||
150 | dev->cn_queue = create_workqueue(dev->name); | |
151 | if (!dev->cn_queue) { | |
152 | kfree(dev); | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | return dev; | |
157 | } | |
158 | ||
159 | void cn_queue_free_dev(struct cn_queue_dev *dev) | |
160 | { | |
161 | struct cn_callback_entry *cbq, *n; | |
162 | ||
163 | flush_workqueue(dev->cn_queue); | |
164 | destroy_workqueue(dev->cn_queue); | |
165 | ||
166 | spin_lock_bh(&dev->queue_lock); | |
167 | list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) | |
168 | list_del(&cbq->callback_entry); | |
169 | spin_unlock_bh(&dev->queue_lock); | |
170 | ||
171 | while (atomic_read(&dev->refcnt)) { | |
172 | printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n", | |
173 | dev->name, atomic_read(&dev->refcnt)); | |
174 | msleep(1000); | |
175 | } | |
176 | ||
177 | kfree(dev); | |
178 | dev = NULL; | |
179 | } |