/* * lib80211 -- common bits for IEEE802.11 drivers * * Copyright(c) 2008 John W. Linville * * Portions copied from old ieee80211 component, w/ original copyright * notices below: * * Host AP crypto routines * * Copyright (c) 2002-2003, Jouni Malinen * Portions Copyright (C) 2004, Intel Corporation * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #define DRV_NAME "lib80211" #define DRV_DESCRIPTION "common routines for IEEE802.11 drivers" MODULE_DESCRIPTION(DRV_DESCRIPTION); MODULE_AUTHOR("John W. Linville "); MODULE_LICENSE("GPL"); struct lib80211_crypto_alg { struct list_head list; struct lib80211_crypto_ops *ops; }; static LIST_HEAD(lib80211_crypto_algs); static DEFINE_SPINLOCK(lib80211_crypto_lock); static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force); static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info); static void lib80211_crypt_deinit_handler(unsigned long data); int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, spinlock_t *lock) { memset(info, 0, sizeof(*info)); info->name = name; info->lock = lock; INIT_LIST_HEAD(&info->crypt_deinit_list); setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler, (unsigned long)info); return 0; } EXPORT_SYMBOL(lib80211_crypt_info_init); void lib80211_crypt_info_free(struct lib80211_crypt_info *info) { int i; lib80211_crypt_quiescing(info); del_timer_sync(&info->crypt_deinit_timer); lib80211_crypt_deinit_entries(info, 1); for (i = 0; i < NUM_WEP_KEYS; i++) { struct lib80211_crypt_data *crypt = info->crypt[i]; if (crypt) { if (crypt->ops) { crypt->ops->deinit(crypt->priv); module_put(crypt->ops->owner); } kfree(crypt); info->crypt[i] = NULL; } } } EXPORT_SYMBOL(lib80211_crypt_info_free); static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force) { struct lib80211_crypt_data *entry, *next; unsigned long flags; spin_lock_irqsave(info->lock, flags); list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) { if (atomic_read(&entry->refcnt) != 0 && !force) continue; list_del(&entry->list); if (entry->ops) { entry->ops->deinit(entry->priv); module_put(entry->ops->owner); } kfree(entry); } spin_unlock_irqrestore(info->lock, flags); } /* After this, crypt_deinit_list won't accept new members */ static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info) { unsigned long flags; spin_lock_irqsave(info->lock, flags); info->crypt_quiesced = 1; spin_unlock_irqrestore(info->lock, flags); } static void lib80211_crypt_deinit_handler(unsigned long data) { struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data; unsigned long flags; lib80211_crypt_deinit_entries(info, 0); spin_lock_irqsave(info->lock, flags); if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) { printk(KERN_DEBUG "%s: entries remaining in delayed crypt " "deletion list\n", info->name); info->crypt_deinit_timer.expires = jiffies + HZ; add_timer(&info->crypt_deinit_timer); } spin_unlock_irqrestore(info->lock, flags); } void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, struct lib80211_crypt_data **crypt) { struct lib80211_crypt_data *tmp; unsigned long flags; if (*crypt == NULL) return; tmp = *crypt; *crypt = NULL; /* must not run ops->deinit() while there may be pending encrypt or * decrypt operations. Use a list of delayed deinits to avoid needing * locking. */ spin_lock_irqsave(info->lock, flags); if (!info->crypt_quiesced) { list_add(&tmp->list, &info->crypt_deinit_list); if (!timer_pending(&info->crypt_deinit_timer)) { info->crypt_deinit_timer.expires = jiffies + HZ; add_timer(&info->crypt_deinit_timer); } } spin_unlock_irqrestore(info->lock, flags); } EXPORT_SYMBOL(lib80211_crypt_delayed_deinit); int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops) { unsigned long flags; struct lib80211_crypto_alg *alg; alg = kzalloc(sizeof(*alg), GFP_KERNEL); if (alg == NULL) return -ENOMEM; alg->ops = ops; spin_lock_irqsave(&lib80211_crypto_lock, flags); list_add(&alg->list, &lib80211_crypto_algs); spin_unlock_irqrestore(&lib80211_crypto_lock, flags); printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n", ops->name); return 0; } EXPORT_SYMBOL(lib80211_register_crypto_ops); int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops) { struct lib80211_crypto_alg *alg; unsigned long flags; spin_lock_irqsave(&lib80211_crypto_lock, flags); list_for_each_entry(alg, &lib80211_crypto_algs, list) { if (alg->ops == ops) goto found; } spin_unlock_irqrestore(&lib80211_crypto_lock, flags); return -EINVAL; found: printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm '%s'\n", ops->name); list_del(&alg->list); spin_unlock_irqrestore(&lib80211_crypto_lock, flags); kfree(alg); return 0; } EXPORT_SYMBOL(lib80211_unregister_crypto_ops); struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name) { struct lib80211_crypto_alg *alg; unsigned long flags; spin_lock_irqsave(&lib80211_crypto_lock, flags); list_for_each_entry(alg, &lib80211_crypto_algs, list) { if (strcmp(alg->ops->name, name) == 0) goto found; } spin_unlock_irqrestore(&lib80211_crypto_lock, flags); return NULL; found: spin_unlock_irqrestore(&lib80211_crypto_lock, flags); return alg->ops; } EXPORT_SYMBOL(lib80211_get_crypto_ops); static void *lib80211_crypt_null_init(int keyidx) { return (void *)1; } static void lib80211_crypt_null_deinit(void *priv) { } static struct lib80211_crypto_ops lib80211_crypt_null = { .name = "NULL", .init = lib80211_crypt_null_init, .deinit = lib80211_crypt_null_deinit, .owner = THIS_MODULE, }; static int __init lib80211_init(void) { pr_info(DRV_DESCRIPTION "\n"); return lib80211_register_crypto_ops(&lib80211_crypt_null); } static void __exit lib80211_exit(void) { lib80211_unregister_crypto_ops(&lib80211_crypt_null); BUG_ON(!list_empty(&lib80211_crypto_algs)); } module_init(lib80211_init); module_exit(lib80211_exit); ntiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/net/phonet/phonet.h')