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, 3 insertions, 3 deletions

diff --git a/net/caif/cfmuxl.c b/net/caif/cfmuxl.c
index c23979e79dfa..b36f24a4c8e7 100644
--- a/net/caif/cfmuxl.c
+++ b/net/caif/cfmuxl.c
@@ -108,7 +108,7 @@ struct cflayer *cfmuxl_remove_dnlayer(struct cflayer *layr, u8 phyid)
         int idx = phyid % DN_CACHE_SIZE;
 
         spin_lock_bh(&muxl->transmit_lock);
-        rcu_assign_pointer(muxl->dn_cache[idx], NULL);
+        RCU_INIT_POINTER(muxl->dn_cache[idx], NULL);
         dn = get_from_id(&muxl->frml_list, phyid);
         if (dn == NULL)
                 goto out;
@@ -164,7 +164,7 @@ struct cflayer *cfmuxl_remove_uplayer(struct cflayer *layr, u8 id)
         if (up == NULL)
                 goto out;
 
-        rcu_assign_pointer(muxl->up_cache[idx], NULL);
+        RCU_INIT_POINTER(muxl->up_cache[idx], NULL);
         list_del_rcu(&up->node);
 out:
         spin_unlock_bh(&muxl->receive_lock);
@@ -261,7 +261,7 @@ static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
 
                                 idx = layer->id % UP_CACHE_SIZE;
                                 spin_lock_bh(&muxl->receive_lock);
-                                rcu_assign_pointer(muxl->up_cache[idx], NULL);
+                                RCU_INIT_POINTER(muxl->up_cache[idx], NULL);
                                 list_del_rcu(&layer->node);
                                 spin_unlock_bh(&muxl->receive_lock);
                         }