mac80211: fix netdev rename

[linux.git] / net / sched / cls_u32.c

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 246f9065ce34b0ad8f7b176807dea7d50221b087..07372f60bee3364588cb94fcfcad1cc7bee514e5 100644 (file)
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -387,7 +387,7 @@ static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 static void u32_destroy(struct tcf_proto *tp)
 {
        struct tc_u_common *tp_c = tp->data;
-       struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
+       struct tc_u_hnode *root_ht = tp->root;
 
        WARN_ON(root_ht == NULL);
 
@@ -479,7 +479,7 @@ static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
        err = -EINVAL;
        if (tb[TCA_U32_LINK]) {
                u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
-               struct tc_u_hnode *ht_down = NULL;
+               struct tc_u_hnode *ht_down = NULL, *ht_old;
 
                if (TC_U32_KEY(handle))
                        goto errout;
@@ -493,11 +493,12 @@ static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
                }
 
                tcf_tree_lock(tp);
-               ht_down = xchg(&n->ht_down, ht_down);
+               ht_old = n->ht_down;
+               n->ht_down = ht_down;
                tcf_tree_unlock(tp);
 
-               if (ht_down)
-                       ht_down->refcnt--;
+               if (ht_old)
+                       ht_old->refcnt--;
        }
        if (tb[TCA_U32_CLASSID]) {
                n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
@@ -637,8 +638,9 @@ static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
                                break;
 
                n->next = *ins;
-               wmb();
+               tcf_tree_lock(tp);
                *ins = n;
+               tcf_tree_unlock(tp);
 
                *arg = (unsigned long)n;
                return 0;