net: sched: cls_u32 add missing rcu_assign_pointer and annotation

Add missing rcu_assign_pointer and missing  annotation for ht_up
in cls_u32.c

Caught by kbuild bot,

>> net/sched/cls_u32.c:378:36: sparse: incorrect type in initializer (different address spaces)
   net/sched/cls_u32.c:378:36:    expected struct tc_u_hnode *ht
   net/sched/cls_u32.c:378:36:    got struct tc_u_hnode [noderef] <asn:4>*ht_up
>> net/sched/cls_u32.c:610:54: sparse: incorrect type in argument 4 (different address spaces)
   net/sched/cls_u32.c:610:54:    expected struct tc_u_hnode *ht
   net/sched/cls_u32.c:610:54:    got struct tc_u_hnode [noderef] <asn:4>*ht_up
>> net/sched/cls_u32.c:684:18: sparse: incorrect type in assignment (different address spaces)
   net/sched/cls_u32.c:684:18:    expected struct tc_u_hnode [noderef] <asn:4>*ht_up
   net/sched/cls_u32.c:684:18:    got struct tc_u_hnode *[assigned] ht
>> net/sched/cls_u32.c:359:18: sparse: dereference of noderef expression

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 8cffe5a27007..eceeb0456d26 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -375,7 +375,7 @@ static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 {
         struct tc_u_knode __rcu **kp;
         struct tc_u_knode *pkp;
-        struct tc_u_hnode *ht = key->ht_up;
+        struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
 
         if (ht) {
                 kp = &ht->ht[TC_U32_HASH(key->handle)];
@@ -607,7 +607,8 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
                 if (TC_U32_KEY(n->handle) == 0)
                         return -EINVAL;
 
-                return u32_set_parms(net, tp, base, n->ht_up, n, tb,
+                return u32_set_parms(net, tp, base,
+                                     rtnl_dereference(n->ht_up), n, tb,
                                      tca[TCA_RATE], ovr);
         }
 
@@ -681,7 +682,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 #endif
 
         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
-        n->ht_up = ht;
+        RCU_INIT_POINTER(n->ht_up, ht);
         n->handle = handle;
         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
         tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);