diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 793ae12a25714d3a079bfede7a9b954eb37bbc24..331a75c8aee2d5dfe4aea5ad0e0751cabe706099 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -622,7 +622,7 @@ static void ax_setup(struct net_device *dev)
  * best way to fix this is to use a rwlock in the tty struct, but for now we
  * use a single global rwlock for all ttys in ppp line discipline.
  */
-static rwlock_t disc_data_lock = RW_LOCK_UNLOCKED;
+static DEFINE_RWLOCK(disc_data_lock);
 
 static struct mkiss *mkiss_get(struct tty_struct *tty)
 {