cgroup: don't online subsystems before cgroup_name/path() are operational

While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out
cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems
before the new cgroup is associated with it kernfs_node.  This is fine
for cgroup proper but cgroup_name/path() depend on the associated
kernfs_node and if a subsystem makes the new cgroup_subsys_state
visible, which they're allowed to after onlining, it can lead to NULL
dereference.

The current code performs cgroup creation and subsystem onlining in
cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems
visible afterwards.  There's no reason to online the subsystems early
and we can simply drop cgroup_apply_control_enable() call from
cgroup_create() so that the subsystems are onlined and made visible at
the same time.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") 
Cc: stable@vger.kernel.org # v4.6+

path: root/sound/aoa/codecs/Kconfig

config SND_AOA_ONYX
	tristate "support Onyx chip"
	select I2C
	select I2C_POWERMAC
	---help---
	This option enables support for the Onyx (pcm3052)
	codec chip found in the latest Apple machines
	(most of those with digital audio output).

config SND_AOA_TAS
	tristate "support TAS chips"
	select I2C
	select I2C_POWERMAC
	---help---
	This option enables support for the tas chips
	found in a lot of Apple Machines, especially
	iBooks and PowerBooks without digital.

config SND_AOA_TOONIE
	tristate "support Toonie chip"
	---help---
	This option enables support for the toonie codec
	found in the Mac Mini. If you have a Mac Mini and
	want to hear sound, select this option.