net_sched: convert tc_action_ops to use struct list_head
We don't need to maintain our own singly linked list code.
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index dc457c9..8114fef 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -255,12 +255,12 @@
}
EXPORT_SYMBOL(tcf_hash_insert);
-static struct tc_action_ops *act_base = NULL;
+static LIST_HEAD(act_base);
static DEFINE_RWLOCK(act_mod_lock);
int tcf_register_action(struct tc_action_ops *act)
{
- struct tc_action_ops *a, **ap;
+ struct tc_action_ops *a;
/* Must supply act, dump, cleanup and init */
if (!act->act || !act->dump || !act->cleanup || !act->init)
@@ -273,14 +273,13 @@
act->walk = tcf_generic_walker;
write_lock(&act_mod_lock);
- for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
+ list_for_each_entry(a, &act_base, head) {
if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
write_unlock(&act_mod_lock);
return -EEXIST;
}
}
- act->next = NULL;
- *ap = act;
+ list_add_tail(&act->head, &act_base);
write_unlock(&act_mod_lock);
return 0;
}
@@ -288,16 +287,15 @@
int tcf_unregister_action(struct tc_action_ops *act)
{
- struct tc_action_ops *a, **ap;
+ struct tc_action_ops *a;
int err = -ENOENT;
write_lock(&act_mod_lock);
- for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
+ list_for_each_entry(a, &act_base, head)
if (a == act)
break;
if (a) {
- *ap = a->next;
- a->next = NULL;
+ list_del(&act->head);
err = 0;
}
write_unlock(&act_mod_lock);
@@ -312,7 +310,7 @@
if (kind) {
read_lock(&act_mod_lock);
- for (a = act_base; a; a = a->next) {
+ list_for_each_entry(a, &act_base, head) {
if (strcmp(kind, a->kind) == 0) {
if (!try_module_get(a->owner)) {
read_unlock(&act_mod_lock);
@@ -333,7 +331,7 @@
if (kind) {
read_lock(&act_mod_lock);
- for (a = act_base; a; a = a->next) {
+ list_for_each_entry(a, &act_base, head) {
if (nla_strcmp(kind, a->kind) == 0) {
if (!try_module_get(a->owner)) {
read_unlock(&act_mod_lock);