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authorPatrick McHardy <kaber@trash.net>2008-11-19 08:03:09 +0000
committerDavid S. Miller <davem@davemloft.net>2008-11-20 04:14:28 -0800
commit47a1a1d4be2910b13a8e90f75c17e253c39531ff (patch)
treec900f283bd96f0b26236152ada24f9a113f65e2b /net/sched/cls_u32.c
parentb94c8afcba3ae6584653b98e315446ea83be6ea5 (diff)
downloadop-kernel-dev-47a1a1d4be2910b13a8e90f75c17e253c39531ff.zip
op-kernel-dev-47a1a1d4be2910b13a8e90f75c17e253c39531ff.tar.gz
pkt_sched: remove unnecessary xchg() in packet classifiers
The use of xchg() hasn't been necessary since 2.2.something when proper locking was added to packet schedulers. In the case of classifiers they mostly weren't even necessary before that since they're mainly used to assign a NULL pointer to the filter root in the ->destroy path; the root is destroyed immediately after that. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/cls_u32.c')
-rw-r--r--net/sched/cls_u32.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 246f906..05d1780 100644
--- 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]);
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