From: Matt Helsley <matthltc@us.ibm.com>

When a system is resumed after a suspend, it will also unfreeze frozen
cgroups.

This patchs modifies the resume sequence to skip the tasks which are part
of a frozen control group.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Tested-by: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/power/process.c |    3 +++
 1 file changed, 3 insertions(+)

diff -puN kernel/power/process.c~container-freezer-skip-frozen-cgroups-during-power-management-resume kernel/power/process.c
--- a/kernel/power/process.c~container-freezer-skip-frozen-cgroups-during-power-management-resume
+++ a/kernel/power/process.c
@@ -135,6 +135,9 @@ static void thaw_tasks(bool nosig_only)
 		if (nosig_only && should_send_signal(p))
 			continue;
 
+		if (cgroup_frozen(p))
+			continue;
+
 		thaw_process(p);
 	} while_each_thread(g, p);
 	read_unlock(&tasklist_lock);
_