From 7d331fa985d3a39d5b8cb60caf016d3e53e57c91 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Tue, 13 May 2014 12:11:00 -0400
Subject: [PATCH] cgroup: use restart_syscall() for retries after offline waits
 in cgroup_subtree_control_write()

After waiting for a child to finish offline,
cgroup_subtree_control_write() jumps up to retry from after the input
parsing and active protection breaking.  This retry makes the
scheduled locking update - removal of cgroup_tree_mutex - more
difficult.  Let's simplify it by returning with restart_syscall() for
retries.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
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