cgroup: css_release() shouldn't clear cgroup->subsys[]

c1a71504 ("cgroup: don't recycle cgroup id until all csses' have
been destroyed") made cgroup ID persist until a cgroup is released and
add cgroup->subsys[] clearing to css_release() so that css_from_id()
doesn't return a css which has already been released which happens
before cgroup release; however, the right change here was updating
offline_css() to clear cgroup->subsys[] which was done by e3297803
("cgroup: cgroup->subsys[] should be cleared after the css is
offlined") instead of clearing it from css_release().

We're now clearing cgroup->subsys[] twice.  This is okay for
traditional hierarchies as a css's lifetime is the same as its
cgroup's; however, this confuses unified hierarchy and turning on and
off a controller repeatedly using "cgroup.subtree_control" can lead to
an oops like the following which happens because cgroup->subsys[] is
incorrectly cleared asynchronously by css_release().

 BUG: unable to handle kernel NULL pointer dereference at 00000000000000 08
 IP: [<ffffffff81130c11>] kill_css+0x21/0x1c0
 PGD 1170d067 PUD f0ab067 PMD 0
 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
 Modules linked in:
 CPU: 2 PID: 459 Comm: bash Not tainted 3.15.0-rc2-work+ #5
 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 task: ffff880009296710 ti: ffff88000e198000 task.ti: ffff88000e198000
 RIP: 0010:[<ffffffff81130c11>]  [<ffffffff81130c11>] kill_css+0x21/0x1c0
 RSP: 0018:ffff88000e199dc8  EFLAGS: 00010202
 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000001
 RDX: 0000000000000001 RSI: ffffffff8238a968 RDI: ffff880009296f98
 RBP: ffff88000e199de0 R08: 0000000000000001 R09: 02b0000000000000
 R10: 0000000000000000 R11: ffff880009296fc0 R12: 0000000000000001
 R13: ffff88000db6fc58 R14: 0000000000000001 R15: ffff8800139dcc00
 FS:  00007ff9160c5740(0000) GS:ffff88001fb00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000008 CR3: 0000000013947000 CR4: 00000000000006e0
 Stack:
  ffff88000e199de0 ffffffff82389160 0000000000000001 ffff88000e199e80
  ffffffff8113537f 0000000000000007 ffff88000e74af00 ffff88000e199e48
  ffff880009296710 ffff88000db6fc00 ffffffff8239c100 0000000000000002
 Call Trace:
  [<ffffffff8113537f>] cgroup_subtree_control_write+0x85f/0xa00
  [<ffffffff8112fd18>] cgroup_file_write+0x38/0x1d0
  [<ffffffff8126fc97>] kernfs_fop_write+0xe7/0x170
  [<ffffffff811f2ae6>] vfs_write+0xb6/0x1c0
  [<ffffffff811f35ad>] SyS_write+0x4d/0xc0
  [<ffffffff81d0acd2>] system_call_fastpath+0x16/0x1b
 Code: 5c 41 5d 41 5e 41 5f 5d c3 90 0f 1f 44 00 00 55 48 89 e5 41 54 53 48 89 fb 48 83 ec 08 8b 05 37 ad 29 01 85 c0 0f 85 df 00 00 00 <48> 8b 43 08 48 8b 3b be 01 00 00 00 8b 48 5c d3 e6 e8 49 ff ff
 RIP  [<ffffffff81130c11>] kill_css+0x21/0x1c0
  RSP <ffff88000e199dc8>
 CR2: 0000000000000008
 ---[ end trace e7aae1f877c4e1b4 ]---

Remove the unnecessary cgroup->subsys[] clearing from css_release().
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

kernel/cgroup.c

@@ -4102,7 +4102,6 @@ static void css_release(struct percpu_ref *ref)
 		container_of(ref, struct cgroup_subsys_state, refcnt);
 	struct cgroup_subsys *ss = css->ss;
 
-	RCU_INIT_POINTER(css->cgroup->subsys[ss->id], NULL);
 	cgroup_idr_remove(&ss->css_idr, css->id);
 
 	call_rcu(&css->rcu_head, css_free_rcu_fn);