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
Signed-off-by: Matt Helsley
Acked-by: Serge E. Hallyn
Tested-by: Matt Helsley
---
kernel/power/process.c | 3 +++
1 file changed, 3 insertions(+)

Index: linux-2.6.27-rc1-mm1/kernel/power/process.c
================================================== =================
--- linux-2.6.27-rc1-mm1.orig/kernel/power/process.c
+++ linux-2.6.27-rc1-mm1/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);

--
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