ieee80211: cleanup crypto list handling, other minor cleanups.

include/net/ieee80211_crypt.h

@@ -31,6 +31,7 @@ enum {
 
 struct ieee80211_crypto_ops {
 	const char *name;
+	struct list_head list;
 
 	/* init new crypto context (e.g., allocate private data space,
 	 * select IV, etc.); returns NULL on failure or pointer to allocated

net/ieee80211/ieee80211_crypt.c

@@ -11,15 +11,14 @@
  *
  */
 
-#include <linux/config.h>
+#include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
-#include <asm/string.h>
-#include <asm/errno.h>
-
+#include <linux/string.h>
 #include <net/ieee80211.h>
 
+
 MODULE_AUTHOR("Jouni Malinen");
 MODULE_DESCRIPTION("HostAP crypto");
 MODULE_LICENSE("GPL");
@@ -29,32 +28,20 @@ struct ieee80211_crypto_alg {
 	struct ieee80211_crypto_ops *ops;
 };
 
-struct ieee80211_crypto {
-	struct list_head algs;
-	spinlock_t lock;
-};
-
-static struct ieee80211_crypto *hcrypt;
+static LIST_HEAD(ieee80211_crypto_algs);
+static DEFINE_SPINLOCK(ieee80211_crypto_lock);
 
 void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
 {
-	struct list_head *ptr, *n;
-	struct ieee80211_crypt_data *entry;
+ 	struct ieee80211_crypt_data *entry, *next;
 	unsigned long flags;
 
 	spin_lock_irqsave(&ieee->lock, flags);
-
-	if (list_empty(&ieee->crypt_deinit_list))
-		goto unlock;
-
-	for (ptr = ieee->crypt_deinit_list.next, n = ptr->next;
-	     ptr != &ieee->crypt_deinit_list; ptr = n, n = ptr->next) {
-		entry = list_entry(ptr, struct ieee80211_crypt_data, list);
-
+ 	list_for_each_entry_safe(entry, next, &ieee->crypt_deinit_list, list) {
 		if (atomic_read(&entry->refcnt) != 0 && !force)
 			continue;
 
-		list_del(ptr);
+		list_del(&entry->list);
 
 		if (entry->ops) {
 			entry->ops->deinit(entry->priv);
@@ -62,7 +49,6 @@ void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
 		}
 		kfree(entry);
 	}
-      unlock:
 	spin_unlock_irqrestore(&ieee->lock, flags);
 }
 
@@ -125,9 +111,6 @@ int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
 	unsigned long flags;
 	struct ieee80211_crypto_alg *alg;
 
-	if (hcrypt == NULL)
-		return -1;
-
 	alg = kmalloc(sizeof(*alg), GFP_KERNEL);
 	if (alg == NULL)
 		return -ENOMEM;
@@ -135,9 +118,9 @@ int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
 	memset(alg, 0, sizeof(*alg));
 	alg->ops = ops;
 
-	spin_lock_irqsave(&hcrypt->lock, flags);
-	list_add(&alg->list, &hcrypt->algs);
-	spin_unlock_irqrestore(&hcrypt->lock, flags);
+	spin_lock_irqsave(&ieee80211_crypto_lock, flags);
+	list_add(&alg->list, &ieee80211_crypto_algs);
+	spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
 
 	printk(KERN_DEBUG "ieee80211_crypt: registered algorithm '%s'\n",
 	       ops->name);
@@ -147,64 +130,49 @@ int ieee80211_register_crypto_ops(struct ieee80211_crypto_ops *ops)
 
 int ieee80211_unregister_crypto_ops(struct ieee80211_crypto_ops *ops)
 {
+	struct ieee80211_crypto_alg *alg;
 	unsigned long flags;
-	struct list_head *ptr;
-	struct ieee80211_crypto_alg *del_alg = NULL;
-
-	if (hcrypt == NULL)
-		return -1;
-
-	spin_lock_irqsave(&hcrypt->lock, flags);
-	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
-		struct ieee80211_crypto_alg *alg =
-		    (struct ieee80211_crypto_alg *)ptr;
-		if (alg->ops == ops) {
-			list_del(&alg->list);
-			del_alg = alg;
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&hcrypt->lock, flags);
 
-	if (del_alg) {
-		printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
-		       "'%s'\n", ops->name);
-		kfree(del_alg);
+	spin_lock_irqsave(&ieee80211_crypto_lock, flags);
+	list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
+		if (alg->ops == ops)
+			goto found;
 	}
-
-	return del_alg ? 0 : -1;
+	spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
+	return -EINVAL;
+
+ found:
+	printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
+			  "'%s'\n", ops->name);
+	list_del(&alg->list);
+	spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
+	kfree(alg);
+	return 0;
 }
 
 struct ieee80211_crypto_ops *ieee80211_get_crypto_ops(const char *name)
 {
+	struct ieee80211_crypto_alg *alg;
 	unsigned long flags;
-	struct list_head *ptr;
-	struct ieee80211_crypto_alg *found_alg = NULL;
-
-	if (hcrypt == NULL)
-		return NULL;
-
-	spin_lock_irqsave(&hcrypt->lock, flags);
-	for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) {
-		struct ieee80211_crypto_alg *alg =
-		    (struct ieee80211_crypto_alg *)ptr;
-		if (strcmp(alg->ops->name, name) == 0) {
-			found_alg = alg;
-			break;
-		}
+
+	spin_lock_irqsave(&ieee80211_crypto_lock, flags);
+	list_for_each_entry(alg, &ieee80211_crypto_algs, list) {
+		if (strcmp(alg->ops->name, name) == 0)
+			goto found;
 	}
-	spin_unlock_irqrestore(&hcrypt->lock, flags);
+	spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
+	return NULL;
 
-	if (found_alg)
-		return found_alg->ops;
-	else
-		return NULL;
+ found:
+	spin_unlock_irqrestore(&ieee80211_crypto_lock, flags);
+	return alg->ops;
 }
 
 static void *ieee80211_crypt_null_init(int keyidx)
 {
 	return (void *)1;
 }
+
 static void ieee80211_crypt_null_deinit(void *priv)
 {
 }
@@ -213,56 +181,18 @@ static struct ieee80211_crypto_ops ieee80211_crypt_null = {
 	.name = "NULL",
 	.init = ieee80211_crypt_null_init,
 	.deinit = ieee80211_crypt_null_deinit,
-	.encrypt_mpdu = NULL,
-	.decrypt_mpdu = NULL,
-	.encrypt_msdu = NULL,
-	.decrypt_msdu = NULL,
-	.set_key = NULL,
-	.get_key = NULL,
-	.extra_mpdu_prefix_len = 0,
-	.extra_mpdu_postfix_len = 0,
 	.owner = THIS_MODULE,
 };
 
 static int __init ieee80211_crypto_init(void)
 {
-	int ret = -ENOMEM;
-
-	hcrypt = kmalloc(sizeof(*hcrypt), GFP_KERNEL);
-	if (!hcrypt)
-		goto out;
-
-	memset(hcrypt, 0, sizeof(*hcrypt));
-	INIT_LIST_HEAD(&hcrypt->algs);
-	spin_lock_init(&hcrypt->lock);
-
-	ret = ieee80211_register_crypto_ops(&ieee80211_crypt_null);
-	if (ret < 0) {
-		kfree(hcrypt);
-		hcrypt = NULL;
-	}
-      out:
-	return ret;
+	return ieee80211_register_crypto_ops(&ieee80211_crypt_null);
 }
 
 static void __exit ieee80211_crypto_deinit(void)
 {
-	struct list_head *ptr, *n;
-
-	if (hcrypt == NULL)
-		return;
-
-	for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs;
-	     ptr = n, n = ptr->next) {
-		struct ieee80211_crypto_alg *alg =
-		    (struct ieee80211_crypto_alg *)ptr;
-		list_del(ptr);
-		printk(KERN_DEBUG "ieee80211_crypt: unregistered algorithm "
-		       "'%s' (deinit)\n", alg->ops->name);
-		kfree(alg);
-	}
-
-	kfree(hcrypt);
+	ieee80211_unregister_crypto_ops(&ieee80211_crypt_null);
+	BUG_ON(!list_empty(&ieee80211_crypto_algs));
 }
 
 EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);