cgroup: cls: remove unnecessary task_cls_classid

We can get classid through cgroup_subsys_state,
this is directviewing and effective.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 867b4a3e3980..16006c92c3fd 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -72,11 +72,11 @@ static void cgrp_attach(struct cgroup_subsys_state *css,
                         struct cgroup_taskset *tset)
 {
         struct task_struct *p;
-        void *v;
+        struct cgroup_cls_state *cs = css_cls_state(css);
+        void *v = (void *)(unsigned long)cs->classid;
 
         cgroup_taskset_for_each(p, css, tset) {
                 task_lock(p);
-                v = (void *)(unsigned long)task_cls_classid(p);
                 iterate_fd(p->files, 0, update_classid, v);
                 task_unlock(p);
         }