cgroups: check for empty cgroups on freeze/unfreeze

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

cgroups: check for empty cgroups on freeze/unfreeze
96ce641c · Christian Brauner · 67ed2bd3 · 96ce641c
Unverified Commit 96ce641c authored Aug 29, 2019 by Christian Brauner
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cgfsng.c src/lxc/cgroups/cgfsng.c +6 -0

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--- a/src/lxc/cgroups/cgfsng.c
+++ b/src/lxc/cgroups/cgfsng.c
@@ -2003,6 +2003,9 @@ __cgfsng_ops static bool cgfsng_freeze(struct cgroup_ops *ops)
 	__do_fclose FILE *f = NULL;
 	struct hierarchy *h;

+	if (!ops->hierarchies)
+		return true;
+
 	if (ops->cgroup_layout != CGROUP_LAYOUT_UNIFIED) {
 		h = get_hierarchy(ops, "freezer");
 		if (!h)
@@ -2054,6 +2057,9 @@ __cgfsng_ops static bool cgfsng_unfreeze(struct cgroup_ops *ops)
 	__do_free char *fullpath = NULL;
 	struct hierarchy *h;

+	if (!ops->hierarchies)
+		return true;
+
 	if (ops->cgroup_layout != CGROUP_LAYOUT_UNIFIED) {
 		h = get_hierarchy(ops, "freezer");
 		if (!h)