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net_sched: act: clean up tca_action_flush()

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We could allocate tc_action on stack in tca_action_flush(),
since it is not large.

Also, we could use create_a() in tcf_action_get_1().

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>
This commit is contained in:
WANG Cong 2014-02-11 17:07:35 -08:00 committed by David S. Miller
parent 55334a5db5
commit 03701d6ebd
1 changed files with 23 additions and 30 deletions
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53
net/sched/act_api.c
View file

@ -685,6 +685,20 @@ act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
return rtnl_unicast(skb, net, portid);
}
static struct tc_action *create_a(int i)
{
struct tc_action *act;
act = kzalloc(sizeof(*act), GFP_KERNEL);
if (act == NULL) {
pr_debug("create_a: failed to alloc!\n");
return NULL;
}
act->order = i;
INIT_LIST_HEAD(&act->list);
return act;
}
static struct tc_action *
tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
{
@ -704,11 +718,10 @@ tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
index = nla_get_u32(tb[TCA_ACT_INDEX]);
err = -ENOMEM;
a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
a = create_a(0);
if (a == NULL)
goto err_out;
INIT_LIST_HEAD(&a->list);
err = -EINVAL;
a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
if (a->ops == NULL) /* could happen in batch of actions */
@ -738,20 +751,6 @@ static void cleanup_a(struct list_head *actions)
}
}
static struct tc_action *create_a(int i)
{
struct tc_action *act;
act = kzalloc(sizeof(*act), GFP_KERNEL);
if (act == NULL) {
pr_debug("create_a: failed to alloc!\n");
return NULL;
}
act->order = i;
INIT_LIST_HEAD(&act->list);
return act;
}
static int tca_action_flush(struct net *net, struct nlattr *nla,
struct nlmsghdr *n, u32 portid)
{
@ -763,18 +762,12 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
struct nlattr *nest;
struct nlattr *tb[TCA_ACT_MAX + 1];
struct nlattr *kind;
struct tc_action *a = create_a(0);
struct tc_action a;
int err = -ENOMEM;
if (a == NULL) {
pr_debug("tca_action_flush: couldnt create tc_action\n");
return err;
}
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb) {
pr_debug("tca_action_flush: failed skb alloc\n");
kfree(a);
return err;
}
@ -786,8 +779,10 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
err = -EINVAL;
kind = tb[TCA_ACT_KIND];
a->ops = tc_lookup_action(kind);
if (a->ops == NULL) /*some idjot trying to flush unknown action */
memset(&a, 0, sizeof(struct tc_action));
INIT_LIST_HEAD(&a.list);
a.ops = tc_lookup_action(kind);
if (a.ops == NULL) /*some idjot trying to flush unknown action */
goto err_out;
nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
@ -802,7 +797,7 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
if (nest == NULL)
goto out_module_put;
err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a);
if (err < 0)
goto out_module_put;
if (err == 0)
@ -812,8 +807,7 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
nlh->nlmsg_flags |= NLM_F_ROOT;
module_put(a->ops->owner);
kfree(a);
module_put(a.ops->owner);
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
if (err > 0)
@ -822,11 +816,10 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
return err;
out_module_put:
module_put(a->ops->owner);
module_put(a.ops->owner);
err_out:
noflush_out:
kfree_skb(skb);
kfree(a);
return err;
}