ia64/linux-2.6.18-xen.hg

view net/ieee80211/ieee80211_crypt.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /*
2 * Host AP crypto routines
3 *
4 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com>
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 version 2 as
9 * published by the Free Software Foundation. See README and COPYING for
10 * more details.
11 *
12 */
14 #include <linux/errno.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <net/ieee80211.h>
21 MODULE_AUTHOR("Jouni Malinen");
22 MODULE_DESCRIPTION("HostAP crypto");
23 MODULE_LICENSE("GPL");
25 struct ieee80211_crypto_alg {
26 struct list_head list;
27 struct ieee80211_crypto_ops *ops;
28 };
30 static LIST_HEAD(ieee80211_crypto_algs);
31 static DEFINE_SPINLOCK(ieee80211_crypto_lock);
33 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
34 {
35 struct ieee80211_crypt_data *entry, *next;
36 unsigned long flags;
38 spin_lock_irqsave(&ieee->lock, flags);
39 list_for_each_entry_safe(entry, next, &ieee->crypt_deinit_list, list) {
40 if (atomic_read(&entry->refcnt) != 0 && !force)
41 continue;
43 list_del(&entry->list);
45 if (entry->ops) {
46 entry->ops->deinit(entry->priv);
47 module_put(entry->ops->owner);
48 }
49 kfree(entry);
50 }
51 spin_unlock_irqrestore(&ieee->lock, flags);
52 }
54 /* After this, crypt_deinit_list won't accept new members */
55 void ieee80211_crypt_quiescing(struct ieee80211_device *ieee)
56 {
57 unsigned long flags;
59 spin_lock_irqsave(&ieee->lock, flags);
60 ieee->crypt_quiesced = 1;
61 spin_unlock_irqrestore(&ieee->lock, flags);
62 }
64 void ieee80211_crypt_deinit_handler(unsigned long data)
65 {
66 struct ieee80211_device *ieee = (struct ieee80211_device *)data;
67 unsigned long flags;
69 ieee80211_crypt_deinit_entries(ieee, 0);
71 spin_lock_irqsave(&ieee->lock, flags);
72 if (!list_empty(&ieee->crypt_deinit_list) && !ieee->crypt_quiesced) {
73 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
74 "deletion list\n", ieee->dev->name);
75 ieee->crypt_deinit_timer.expires = jiffies + HZ;
76 add_timer(&ieee->crypt_deinit_timer);
77 }
78 spin_unlock_irqrestore(&ieee->lock, flags);
79 }
81 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
82 struct ieee80211_crypt_data **crypt)
83 {
84 struct ieee80211_crypt_data *tmp;
85 unsigned long flags;
87 if (*crypt == NULL)
88 return;
90 tmp = *crypt;
91 *crypt = NULL;
93 /* must not run ops->deinit() while there may be pending encrypt or
94 * decrypt operations. Use a list of delayed deinits to avoid needing
95 * locking. */
97 spin_lock_irqsave(&ieee->lock, flags);
98 if (!ieee->crypt_quiesced) {
99 list_add(&tmp->list, &ieee->crypt_deinit_list);
100 if (!timer_pending(&ieee->crypt_deinit_timer)) {
101 ieee->crypt_deinit_timer.expires = jiffies + HZ;
102 add_timer(&ieee->crypt_deinit_timer);
103 }
104 }
105 spin_unlock_irqrestore(&ieee->lock, flags);
106 }
108 int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
109 {
110 unsigned long flags;
111 struct ieee80211_crypto_alg *alg;
113 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
114 if (alg == NULL)
115 return -ENOMEM;
117 alg->ops = ops;
119 spin_lock_irqsave(&ieee80211_crypto_lock, flags);
120 list_add(&alg->list, &ieee80211_crypto_algs);
121 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
123 printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
124 ops->name);
126 return 0;
127 }
129 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
130 {
131 struct ieee80211_crypto_alg *alg;
132 unsigned long flags;
134 spin_lock_irqsave(&ieee80211_crypto_lock, flags);
135 list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
136 if (alg->ops == ops)
137 goto found;
138 }
139 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
140 return -EINVAL;
142 found:
143 printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
144 "'%s'\n", ops->name);
145 list_del(&alg->list);
146 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
147 kfree(alg);
148 return 0;
149 }
151 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
152 {
153 struct ieee80211_crypto_alg *alg;
154 unsigned long flags;
156 spin_lock_irqsave(&ieee80211_crypto_lock, flags);
157 list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
158 if (strcmp(alg->ops->name, name) == 0)
159 goto found;
160 }
161 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
162 return NULL;
164 found:
165 spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
166 return alg->ops;
167 }
169 static void *ieee80211_crypt_null_init(int keyidx)
170 {
171 return (void *)1;
172 }
174 static void ieee80211_crypt_null_deinit(void *priv)
175 {
176 }
178 static struct ieee80211_crypto_ops ieee80211_crypt_null = {
179 .name = "NULL",
180 .init = ieee80211_crypt_null_init,
181 .deinit = ieee80211_crypt_null_deinit,
182 .owner = THIS_MODULE,
183 };
185 static int __init ieee80211_crypto_init(void)
186 {
187 return ieee80211_register_crypto_ops(&ieee80211_crypt_null);
188 }
190 static void __exit ieee80211_crypto_deinit(void)
191 {
192 ieee80211_unregister_crypto_ops(&ieee80211_crypt_null);
193 BUG_ON(!list_empty(&ieee80211_crypto_algs));
194 }
196 EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
197 EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
198 EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
199 EXPORT_SYMBOL(ieee80211_crypt_quiescing);
201 EXPORT_SYMBOL(ieee80211_register_crypto_ops);
202 EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);
203 EXPORT_SYMBOL(ieee80211_get_crypto_ops);
205 module_init(ieee80211_crypto_init);
206 module_exit(ieee80211_crypto_deinit);