commit 7d331fa985d3a39d5b8cb60caf016d3e53e57c91
author Tejun Heo <tj@kernel.org> Tue May 13 12:11:00 2014 -0400
committer Tejun Heo <tj@kernel.org> Tue May 13 12:11:00 2014 -0400
tree 91521a5c39556347262c2b41c05428236e6ced46
parent d37167ab7b3d67d53519585a44c47416e6758ed2

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>