Index: if.c
===================================================================
RCS file: /cvs/src/sys/net/if.c,v
retrieving revision 1.380
diff -u -p -r1.380 if.c
--- if.c	13 Sep 2015 18:15:03 -0000	1.380
+++ if.c	27 Sep 2015 05:47:35 -0000
@@ -279,11 +279,7 @@ if_idxmap_insert(struct ifnet *ifp)
 	struct srp *map;
 	unsigned int index, i;
 
-	/*
-	 * give the ifp an initial refcnt of 1 to ensure it will not
-	 * be freed until if_idxmap_remove returns.
-	 */
-	ifp->if_refcnt = 1;
+	refcnt_init(&ifp->if_refcnt);
 
 	/* the kernel lock guarantees serialised modifications to if_idxmap */
 	KERNEL_ASSERT_LOCKED();
@@ -345,7 +341,7 @@ if_idxmap_remove(struct ifnet *ifp)
 {
 	struct if_map *if_map;
 	struct srp *map;
-	unsigned int index, r;
+	unsigned int index;
 
 	index = ifp->if_index;
 
@@ -362,10 +358,8 @@ if_idxmap_remove(struct ifnet *ifp)
 	if_idxmap.count--;
 	/* end of if_idxmap modifications */
 
-	/* release the initial ifp refcnt */
-	r = atomic_dec_int_nv(&ifp->if_refcnt);
-	if (r != 0)
-		printf("%s: refcnt %u\n", ifp->if_xname, r);
+	/* sleep until the last reference is released */
+	refcnt_finalize(&ifp->if_refcnt, "ifidxrm");
 }
 
 void
@@ -1554,7 +1544,7 @@ if_get(unsigned int index)
 struct ifnet *
 if_ref(struct ifnet *ifp)
 {
-	atomic_inc_int(&ifp->if_refcnt);
+	refcnt_take(&ifp->if_refcnt);
 
 	return (ifp);
 }
@@ -1565,7 +1555,7 @@ if_put(struct ifnet *ifp)
 	if (ifp == NULL)
 		return;
 
-	atomic_dec_int(&ifp->if_refcnt);
+	refcnt_rele_wake(&ifp->if_refcnt);
 }
 
 /*