From: Aristeu Rozanski <aris@redhat.com>
Date: Fri, 15 Feb 2013 16:55:46 +0000 (-0500)
Subject: devcg: use css_online and css_offline
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~124^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1909554c9715e4d032497993bb56f2726bfa89ae;p=pandora-kernel.git

devcg: use css_online and css_offline

Allocate resources and change behavior only when online. This is needed in
order to determine if a node is suitable for hierarchy propagation or if it's
being removed.

Locking:
Both functions take devcgroup_mutex to make changes to device_cgroup structure.
Hierarchy propagation will also take devcgroup_mutex before walking the
tree while walking the tree itself is protected by rcu lock.

Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Aristeu Rozanski <aris@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

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