cgroups: fix a race between rmdir and remount

[h-e-n] / kernel / cgroup.c

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index fe00b3b..8185a0f 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -702,7 +702,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
         * any child cgroups exist. This is theoretically supportable
         * but involves complex error handling, so it's being left until
         * later */
-       if (!list_empty(&cgrp->children))
+       if (root->number_of_cgroups > 1)
                return -EBUSY;
 
        /* Process each subsystem */