[NET]: Convert RTNL to mutex.

This patch turns the RTNL from a semaphore to a new 2.6.16 mutex and
gets rid of some of the leftover legacy.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 13 deletions

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index edccefb45188..d263853a8f1c 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -907,6 +907,7 @@ struct tcamsg
 #ifdef __KERNEL__
 
 #include <linux/config.h>
+#include <linux/mutex.h>
 
 extern size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size);
 static __inline__ int rtattr_strcmp(const struct rtattr *rta, const char *str)
@@ -1038,24 +1039,17 @@ __rta_reserve(struct sk_buff *skb, int attrtype, int attrlen)
 
 extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
 
-extern struct semaphore rtnl_sem;
-
-#define rtnl_shlock()           down(&rtnl_sem)
-#define rtnl_shlock_nowait()    down_trylock(&rtnl_sem)
-
-#define rtnl_shunlock() do { up(&rtnl_sem); \
-                             if (rtnl && rtnl->sk_receive_queue.qlen) \
-                                     rtnl->sk_data_ready(rtnl, 0); \
-                        } while(0)
-
+/* RTNL is used as a global lock for all changes to network configuration  */
 extern void rtnl_lock(void);
-extern int rtnl_lock_interruptible(void);
 extern void rtnl_unlock(void);
+extern int rtnl_trylock(void);
+
 extern void rtnetlink_init(void);
+extern void __rtnl_unlock(void);
 
 #define ASSERT_RTNL() do { \
-        if (unlikely(down_trylock(&rtnl_sem) == 0)) { \
-                up(&rtnl_sem); \
+        if (unlikely(rtnl_trylock())) { \
+                rtnl_unlock(); \
                 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
                        __FILE__,  __LINE__); \
                 dump_stack(); \