cfg80211: rename cfg80211_drv_mutex to cfg80211_mutex

cfg80211_drv_mutex is protecting more than the driver list,
this renames it and documents what its currently supposed to
protect.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 42 insertions, 37 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 35d457b2751e..39d40d1e06db 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -31,7 +31,12 @@ MODULE_DESCRIPTION("wireless configuration support");
  * only read the list, and that can happen quite
  * often because we need to do it for each command */
 LIST_HEAD(cfg80211_drv_list);
-DEFINE_MUTEX(cfg80211_drv_mutex);
+
+/*
+ * This is used to protect the cfg80211_drv_list, cfg80211_regdomain, and
+ * the last reguluatory request receipt in regd.c
+ */
+DEFINE_MUTEX(cfg80211_mutex);
 
 /* for debugfs */
 static struct dentry *ieee80211_debugfs_dir;
@@ -55,7 +60,7 @@ cfg80211_drv_by_wiphy_idx(int wiphy_idx)
         return result;
 }
 
-/* requires cfg80211_drv_mutex to be held! */
+/* requires cfg80211_mutex to be held! */
 static struct cfg80211_registered_device *
 __cfg80211_drv_from_info(struct genl_info *info)
 {
@@ -102,7 +107,7 @@ cfg80211_get_dev_from_info(struct genl_info *info)
 {
         struct cfg80211_registered_device *drv;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
         drv = __cfg80211_drv_from_info(info);
 
         /* if it is not an error we grab the lock on
@@ -111,7 +116,7 @@ cfg80211_get_dev_from_info(struct genl_info *info)
         if (!IS_ERR(drv))
                 mutex_lock(&drv->mtx);
 
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 
         return drv;
 }
@@ -122,7 +127,7 @@ cfg80211_get_dev_from_ifindex(int ifindex)
         struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
         struct net_device *dev;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
         dev = dev_get_by_index(&init_net, ifindex);
         if (!dev)
                 goto out;
@@ -133,7 +138,7 @@ cfg80211_get_dev_from_ifindex(int ifindex)
                 drv = ERR_PTR(-ENODEV);
         dev_put(dev);
  out:
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
         return drv;
 }
 
@@ -149,7 +154,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
         struct cfg80211_registered_device *drv;
         int wiphy_idx, taken = -1, result, digits;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
 
         /* prohibit calling the thing phy%d when %d is not its number */
         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
@@ -197,7 +202,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 
         result = 0;
 out_unlock:
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
         if (result == 0)
                 nl80211_notify_dev_rename(rdev);
 
@@ -224,19 +229,19 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
 
         drv->ops = ops;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
 
         drv->wiphy_idx = wiphy_counter++;
 
         if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
                 wiphy_counter--;
-                mutex_unlock(&cfg80211_drv_mutex);
+                mutex_unlock(&cfg80211_mutex);
                 /* ugh, wrapped! */
                 kfree(drv);
                 return NULL;
         }
 
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 
         /* give it a proper name */
         dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
@@ -314,7 +319,7 @@ int wiphy_register(struct wiphy *wiphy)
         /* check and set up bitrates */
         ieee80211_set_bitrate_flags(wiphy);
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
 
         /* set up regulatory info */
         wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);
@@ -334,7 +339,7 @@ int wiphy_register(struct wiphy *wiphy)
 
         res = 0;
 out_unlock:
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
         return res;
 }
 EXPORT_SYMBOL(wiphy_register);
@@ -344,7 +349,7 @@ void wiphy_unregister(struct wiphy *wiphy)
         struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
 
         /* protect the device list */
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
 
         BUG_ON(!list_empty(&drv->netdev_list));
 
@@ -370,7 +375,7 @@ void wiphy_unregister(struct wiphy *wiphy)
         device_del(&drv->wiphy.dev);
         debugfs_remove(drv->wiphy.debugfsdir);
 
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 }
 EXPORT_SYMBOL(wiphy_unregister);
 
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 4f2e0fe38ce3..f3ab00cbf766 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -70,7 +70,7 @@ bool wiphy_idx_valid(int wiphy_idx)
         return (wiphy_idx >= 0);
 }
 
-extern struct mutex cfg80211_drv_mutex;
+extern struct mutex cfg80211_mutex;
 extern struct list_head cfg80211_drv_list;
 
 struct cfg80211_internal_bss {
@@ -89,13 +89,13 @@ struct cfg80211_internal_bss {
  * the driver's mutex!
  *
  * This means that you need to call cfg80211_put_dev()
- * before being allowed to acquire &cfg80211_drv_mutex!
+ * before being allowed to acquire &cfg80211_mutex!
  *
  * This is necessary because we need to lock the global
  * mutex to get an item off the list safely, and then
  * we lock the drv mutex so it doesn't go away under us.
  *
- * We don't want to keep cfg80211_drv_mutex locked
+ * We don't want to keep cfg80211_mutex locked
  * for all the time in order to allow requests on
  * other interfaces to go through at the same time.
  *
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index b176bb800100..88a530f707e6 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -256,7 +256,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
         int start = cb->args[0];
         struct cfg80211_registered_device *dev;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
         list_for_each_entry(dev, &cfg80211_drv_list, list) {
                 if (++idx <= start)
                         continue;
@@ -267,7 +267,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
                         break;
                 }
         }
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 
         cb->args[0] = idx;
 
@@ -470,7 +470,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
         struct cfg80211_registered_device *dev;
         struct wireless_dev *wdev;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
         list_for_each_entry(dev, &cfg80211_drv_list, list) {
                 if (wp_idx < wp_start) {
                         wp_idx++;
@@ -497,7 +497,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
                 wp_idx++;
         }
  out:
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 
         cb->args[0] = wp_idx;
         cb->args[1] = if_idx;
@@ -1916,9 +1916,9 @@ static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
         if (is_world_regdom(data))
                 return -EINVAL;
 #endif
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
         r = __regulatory_hint(NULL, REGDOM_SET_BY_USER, data, 0, ENVIRON_ANY);
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
         /* This means the regulatory domain was already set, however
          * we don't want to confuse userspace with a "successful error"
          * message so lets just treat it as a success */
@@ -2112,7 +2112,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
         unsigned int i;
         int err = -EINVAL;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
 
         if (!cfg80211_regdomain)
                 goto out;
@@ -2175,7 +2175,7 @@ nla_put_failure:
         genlmsg_cancel(msg, hdr);
         err = -EMSGSIZE;
 out:
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
         return err;
 }
 
@@ -2234,9 +2234,9 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 
         BUG_ON(rule_idx != num_rules);
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
         r = set_regdom(rd);
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
         return r;
 
  bad_reg:
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 2323644330cd..ba823120d245 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1116,7 +1116,7 @@ static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
         return -EINVAL;
 }
 
-/* Caller must hold &cfg80211_drv_mutex */
+/* Caller must hold &cfg80211_mutex */
 int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
                         const char *alpha2,
                         u32 country_ie_checksum,
@@ -1188,13 +1188,13 @@ void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
         int r;
         BUG_ON(!alpha2);
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
         r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER,
                 alpha2, 0, ENVIRON_ANY);
         /* This is required so that the orig_* parameters are saved */
         if (r == -EALREADY && wiphy->strict_regulatory)
                 wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER);
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 }
 EXPORT_SYMBOL(regulatory_hint);
 
@@ -1225,7 +1225,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
         if (!last_request)
                 return;
 
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
 
         /* IE len must be evenly divisible by 2 */
         if (country_ie_len & 0x01)
@@ -1307,7 +1307,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
                 country_ie_regdomain->alpha2, checksum, env);
 
 out:
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 }
 EXPORT_SYMBOL(regulatory_hint_11d);
 
@@ -1562,7 +1562,7 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
 
 /* Use this call to set the current regulatory domain. Conflicts with
  * multiple drivers can be ironed out later. Caller must've already
- * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */
+ * kmalloc'd the rd structure. Caller must hold cfg80211_mutex */
 int set_regdom(const struct ieee80211_regdomain *rd)
 {
         int r;
@@ -1586,7 +1586,7 @@ int set_regdom(const struct ieee80211_regdomain *rd)
         return r;
 }
 
-/* Caller must hold cfg80211_drv_mutex */
+/* Caller must hold cfg80211_mutex */
 void reg_device_remove(struct wiphy *wiphy)
 {
         kfree(wiphy->regd);
@@ -1633,7 +1633,7 @@ int regulatory_init(void)
 
 void regulatory_exit(void)
 {
-        mutex_lock(&cfg80211_drv_mutex);
+        mutex_lock(&cfg80211_mutex);
 
         reset_regdomains();
 
@@ -1644,5 +1644,5 @@ void regulatory_exit(void)
 
         platform_device_unregister(reg_pdev);
 
-        mutex_unlock(&cfg80211_drv_mutex);
+        mutex_unlock(&cfg80211_mutex);
 }