1 files changed, 40 insertions, 19 deletions

diff --git a/net/ieee80211/ieee80211_crypt.c b/net/ieee80211/ieee80211_crypt.c
index 61a9d92e455b..f3b6aa3be638 100644
--- a/net/ieee80211/ieee80211_crypt.c
+++ b/net/ieee80211/ieee80211_crypt.c
@@ -41,6 +41,12 @@ void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
 {
         struct list_head *ptr, *n;
         struct ieee80211_crypt_data *entry;
+        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) {
@@ -57,6 +63,18 @@ void ieee80211_crypt_deinit_entries(struct ieee80211_device *ieee, int force)
                 }
                 kfree(entry);
         }
+      unlock:
+        spin_unlock_irqrestore(&ieee->lock, flags);
+}
+
+/* After this, crypt_deinit_list won't accept new members */
+void ieee80211_crypt_quiescing(struct ieee80211_device *ieee)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ieee->lock, flags);
+        ieee->crypt_quiesced = 1;
+        spin_unlock_irqrestore(&ieee->lock, flags);
 }
 
 void ieee80211_crypt_deinit_handler(unsigned long data)
@@ -64,16 +82,16 @@ void ieee80211_crypt_deinit_handler(unsigned long data)
         struct ieee80211_device *ieee = (struct ieee80211_device *)data;
         unsigned long flags;
 
-        spin_lock_irqsave(&ieee->lock, flags);
         ieee80211_crypt_deinit_entries(ieee, 0);
-        if (!list_empty(&ieee->crypt_deinit_list)) {
+
+        spin_lock_irqsave(&ieee->lock, flags);
+        if (!list_empty(&ieee->crypt_deinit_list) && !ieee->crypt_quiesced) {
                 printk(KERN_DEBUG "%s: entries remaining in delayed crypt "
                        "deletion list\n", ieee->dev->name);
                 ieee->crypt_deinit_timer.expires = jiffies + HZ;
                 add_timer(&ieee->crypt_deinit_timer);
         }
         spin_unlock_irqrestore(&ieee->lock, flags);
-
 }
 
 void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
@@ -93,10 +111,12 @@ void ieee80211_crypt_delayed_deinit(struct ieee80211_device *ieee,
          * locking. */
 
         spin_lock_irqsave(&ieee->lock, flags);
-        list_add(&tmp->list, &ieee->crypt_deinit_list);
-        if (!timer_pending(&ieee->crypt_deinit_timer)) {
-                ieee->crypt_deinit_timer.expires = jiffies + HZ;
-                add_timer(&ieee->crypt_deinit_timer);
+        if (!ieee->crypt_quiesced) {
+                list_add(&tmp->list, &ieee->crypt_deinit_list);
+                if (!timer_pending(&ieee->crypt_deinit_timer)) {
+                        ieee->crypt_deinit_timer.expires = jiffies + HZ;
+                        add_timer(&ieee->crypt_deinit_timer);
+                }
         }
         spin_unlock_irqrestore(&ieee->lock, flags);
 }
@@ -191,18 +211,18 @@ static void ieee80211_crypt_null_deinit(void *priv)
 }
 
 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_prefix_len       = 0,
-        .extra_postfix_len      = 0,
-        .owner                  = THIS_MODULE,
+        .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)
@@ -249,6 +269,7 @@ static void __exit ieee80211_crypto_deinit(void)
 EXPORT_SYMBOL(ieee80211_crypt_deinit_entries);
 EXPORT_SYMBOL(ieee80211_crypt_deinit_handler);
 EXPORT_SYMBOL(ieee80211_crypt_delayed_deinit);
+EXPORT_SYMBOL(ieee80211_crypt_quiescing);
 
 EXPORT_SYMBOL(ieee80211_register_crypto_ops);
 EXPORT_SYMBOL(ieee80211_unregister_crypto_ops);