net-sched: change tcf_destroy_chain() to clear start of filter list

Pass double tcf_proto pointers to tcf_destroy_chain() to make it
clear the start of the filter list for more consistency.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

10 files changed, 16 insertions, 20 deletions

diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
index 635b996c8c35..5d09e8698b57 100644
--- a/net/mac80211/wme.c
+++ b/net/mac80211/wme.c
@@ -323,8 +323,7 @@ static void wme_qdiscop_destroy(struct Qdisc* qd)
         struct ieee80211_hw *hw = &local->hw;
         int queue;
 
-        tcf_destroy_chain(q->filter_list);
-        q->filter_list = NULL;
+        tcf_destroy_chain(&q->filter_list);
 
         for (queue=0; queue < hw->queues; queue++) {
                 skb_queue_purge(&q->requeued[queue]);
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index c40773cdbe45..10f01ad04380 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1252,12 +1252,12 @@ void tcf_destroy(struct tcf_proto *tp)
         kfree(tp);
 }
 
-void tcf_destroy_chain(struct tcf_proto *fl)
+void tcf_destroy_chain(struct tcf_proto **fl)
 {
         struct tcf_proto *tp;
 
-        while ((tp = fl) != NULL) {
-                fl = tp->next;
+        while ((tp = *fl) != NULL) {
+                *fl = tp->next;
                 tcf_destroy(tp);
         }
 }
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index 335273416384..8e5f70ba3a15 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -160,7 +160,7 @@ static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
         *prev = flow->next;
         pr_debug("atm_tc_put: qdisc %p\n", flow->q);
         qdisc_destroy(flow->q);
-        tcf_destroy_chain(flow->filter_list);
+        tcf_destroy_chain(&flow->filter_list);
         if (flow->sock) {
                 pr_debug("atm_tc_put: f_count %d\n",
                         file_count(flow->sock->file));
@@ -588,8 +588,7 @@ static void atm_tc_destroy(struct Qdisc *sch)
         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
         /* races ? */
         while ((flow = p->flows)) {
-                tcf_destroy_chain(flow->filter_list);
-                flow->filter_list = NULL;
+                tcf_destroy_chain(&flow->filter_list);
                 if (flow->ref > 1)
                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
                                flow->ref);
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 09969c1fbc08..2a3c97f7dc63 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1704,7 +1704,7 @@ static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl)
 
         BUG_TRAP(!cl->filters);
 
-        tcf_destroy_chain(cl->filter_list);
+        tcf_destroy_chain(&cl->filter_list);
         qdisc_destroy(cl->q);
         qdisc_put_rtab(cl->R_tab);
         gen_kill_estimator(&cl->bstats, &cl->rate_est);
@@ -1728,10 +1728,8 @@ cbq_destroy(struct Qdisc* sch)
          * be bound to classes which have been destroyed already. --TGR '04
          */
         for (h = 0; h < 16; h++) {
-                for (cl = q->classes[h]; cl; cl = cl->next) {
-                        tcf_destroy_chain(cl->filter_list);
-                        cl->filter_list = NULL;
-                }
+                for (cl = q->classes[h]; cl; cl = cl->next)
+                        tcf_destroy_chain(&cl->filter_list);
         }
         for (h = 0; h < 16; h++) {
                 struct cbq_class *next;
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index 64465bacbe79..c4c1317cd47d 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -416,7 +416,7 @@ static void dsmark_destroy(struct Qdisc *sch)
 
         pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
 
-        tcf_destroy_chain(p->filter_list);
+        tcf_destroy_chain(&p->filter_list);
         qdisc_destroy(p->q);
         kfree(p->mask);
 }
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index fdfaa3fcc16d..eca83a3be293 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1123,7 +1123,7 @@ hfsc_destroy_class(struct Qdisc *sch, struct hfsc_class *cl)
 {
         struct hfsc_sched *q = qdisc_priv(sch);
 
-        tcf_destroy_chain(cl->filter_list);
+        tcf_destroy_chain(&cl->filter_list);
         qdisc_destroy(cl->qdisc);
         gen_kill_estimator(&cl->bstats, &cl->rate_est);
         if (cl != &q->root)
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 6807c97985a5..3fb58f428f72 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1238,7 +1238,7 @@ static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl)
         qdisc_put_rtab(cl->rate);
         qdisc_put_rtab(cl->ceil);
 
-        tcf_destroy_chain(cl->filter_list);
+        tcf_destroy_chain(&cl->filter_list);
 
         while (!list_empty(&cl->children))
                 htb_destroy_class(sch, list_entry(cl->children.next,
@@ -1267,7 +1267,7 @@ static void htb_destroy(struct Qdisc *sch)
            and surprisingly it worked in 2.4. But it must precede it
            because filter need its target class alive to be able to call
            unbind_filter on it (without Oops). */
-        tcf_destroy_chain(q->filter_list);
+        tcf_destroy_chain(&q->filter_list);
 
         while (!list_empty(&q->root))
                 htb_destroy_class(sch, list_entry(q->root.next,
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index 274b1ddb160c..956c80ad5965 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -104,7 +104,7 @@ static void ingress_destroy(struct Qdisc *sch)
 {
         struct ingress_qdisc_data *p = qdisc_priv(sch);
 
-        tcf_destroy_chain(p->filter_list);
+        tcf_destroy_chain(&p->filter_list);
 }
 
 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 4aa2b45dad0a..5532f1031ab5 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -219,7 +219,7 @@ prio_destroy(struct Qdisc* sch)
         int prio;
         struct prio_sched_data *q = qdisc_priv(sch);
 
-        tcf_destroy_chain(q->filter_list);
+        tcf_destroy_chain(&q->filter_list);
         for (prio=0; prio<q->bands; prio++)
                 qdisc_destroy(q->queues[prio]);
 }
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index f0463d757a98..6a97afbfb952 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -520,7 +520,7 @@ static void sfq_destroy(struct Qdisc *sch)
 {
         struct sfq_sched_data *q = qdisc_priv(sch);
 
-        tcf_destroy_chain(q->filter_list);
+        tcf_destroy_chain(&q->filter_list);
         q->perturb_period = 0;
         del_timer_sync(&q->perturb_timer);
 }