[PATCH] kill rtnl_exlock stubs

[Stephen Hemminger <shemminger@xxxxxxxx>]

Rtnetlink has some macro's that are relics from earlier locking.
They are only used a couple of places so are easy to kill.

diff -Nru a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
--- a/include/linux/rtnetlink.h 2004-07-27 09:40:03 -07:00
+++ b/include/linux/rtnetlink.h 2004-07-27 09:40:03 -07:00
@@ -746,10 +746,6 @@
 
 extern struct semaphore rtnl_sem;
 
-#define rtnl_exlock()          do { } while(0)
-#define rtnl_exunlock()                do { } while(0)
-#define rtnl_exlock_nowait()   (0)
-
 #define rtnl_shlock()          down(&rtnl_sem)
 #define rtnl_shlock_nowait()   down_trylock(&rtnl_sem)
 
diff -Nru a/net/core/dev.c b/net/core/dev.c
--- a/net/core/dev.c    2004-07-27 09:40:03 -07:00
+++ b/net/core/dev.c    2004-07-27 09:40:03 -07:00
@@ -3041,7 +3041,6 @@
        while (atomic_read(&dev->refcnt) != 0) {
                if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
                        rtnl_shlock();
-                       rtnl_exlock();
 
                        /* Rebroadcast unregister notification */
                        notifier_call_chain(&netdev_chain,
@@ -3058,7 +3057,6 @@
                                linkwatch_run_queue();
                        }
 
-                       rtnl_exunlock();
                        rtnl_shunlock();
 
                        rebroadcast_time = jiffies;
diff -Nru a/net/core/link_watch.c b/net/core/link_watch.c
--- a/net/core/link_watch.c     2004-07-27 09:40:03 -07:00
+++ b/net/core/link_watch.c     2004-07-27 09:40:03 -07:00
@@ -93,9 +93,7 @@
        clear_bit(LW_RUNNING, &linkwatch_flags);
 
        rtnl_shlock();
-       rtnl_exlock();
        linkwatch_run_queue();
-       rtnl_exunlock();
        rtnl_shunlock();
 }
 
diff -Nru a/net/core/rtnetlink.c b/net/core/rtnetlink.c
--- a/net/core/rtnetlink.c      2004-07-27 09:40:03 -07:00
+++ b/net/core/rtnetlink.c      2004-07-27 09:40:03 -07:00
@@ -56,12 +56,10 @@
 void rtnl_lock(void)
 {
        rtnl_shlock();
-       rtnl_exlock();
 }
  
 void rtnl_unlock(void)
 {
-       rtnl_exunlock();
        rtnl_shunlock();
 
        netdev_run_todo();
@@ -404,13 +402,8 @@
                return -1;
        }
 
-       if (kind != 2) {
-               if (rtnl_exlock_nowait()) {
-                       *errp = 0;
-                       return -1;
-               }
+       if (kind != 2) 
                exclusive = 1;
-       }
 
        memset(&rta, 0, sizeof(rta));
 
@@ -439,14 +432,10 @@
                goto err_inval;
        err = link->doit(skb, nlh, (void *)&rta);
 
-       if (exclusive)
-               rtnl_exunlock();
        *errp = err;
        return err;
 
 err_inval:
-       if (exclusive)
-               rtnl_exunlock();
        *errp = -EINVAL;
        return -1;
 }