rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER

When assigning a NULL value to an RCU protected pointer, no barrier
is needed. The rcu_assign_pointer, used to handle that but will soon
change to not handle the special case.

Convert all rcu_assign_pointer of NULL value.

//smpl
@@ expression P; @@

- rcu_assign_pointer(P, NULL)
+ RCU_INIT_POINTER(P, NULL)

// </smpl>

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 3d1b091d9b2e..86f8f49dae2f 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -62,7 +62,7 @@ static int ieee80211_change_iface(struct wiphy *wiphy,
 
         if (type == NL80211_IFTYPE_AP_VLAN &&
             params && params->use_4addr == 0)
-                rcu_assign_pointer(sdata->u.vlan.sta, NULL);
+                RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
         else if (type == NL80211_IFTYPE_STATION &&
                  params && params->use_4addr >= 0)
                 sdata->u.mgd.use_4addr = params->use_4addr;
@@ -542,7 +542,7 @@ static int ieee80211_config_beacon(struct ieee80211_sub_if_data *sdata,
 
         sdata->vif.bss_conf.dtim_period = new->dtim_period;
 
-        rcu_assign_pointer(sdata->u.ap.beacon, new);
+        RCU_INIT_POINTER(sdata->u.ap.beacon, new);
 
         synchronize_rcu();
 
@@ -594,7 +594,7 @@ static int ieee80211_del_beacon(struct wiphy *wiphy, struct net_device *dev)
         if (!old)
                 return -ENOENT;
 
-        rcu_assign_pointer(sdata->u.ap.beacon, NULL);
+        RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
         synchronize_rcu();
         kfree(old);
 
@@ -857,7 +857,7 @@ static int ieee80211_change_station(struct wiphy *wiphy,
                                 return -EBUSY;
                         }
 
-                        rcu_assign_pointer(vlansdata->u.vlan.sta, sta);
+                        RCU_INIT_POINTER(vlansdata->u.vlan.sta, sta);
                 }
 
                 sta->sdata = vlansdata;