cgroup: fix a failure path in create_css()
authorLi Zefan <lizefan@huawei.com>
Tue, 18 Mar 2014 09:02:36 +0000 (17:02 +0800)
committerTejun Heo <tj@kernel.org>
Tue, 18 Mar 2014 21:15:36 +0000 (17:15 -0400)
If online_css() fails, we should remove cgroup files belonging
to css->ss.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
kernel/cgroup.c

index 105f273..0c753dd 100644 (file)
@@ -4112,17 +4112,17 @@ static int create_css(struct cgroup *cgrp, struct cgroup_subsys *ss)
 
        err = percpu_ref_init(&css->refcnt, css_release);
        if (err)
-               goto err_free;
+               goto err_free_css;
 
        init_css(css, ss, cgrp);
 
        err = cgroup_populate_dir(cgrp, 1 << ss->subsys_id);
        if (err)
-               goto err_free;
+               goto err_free_percpu_ref;
 
        err = online_css(css);
        if (err)
-               goto err_free;
+               goto err_clear_dir;
 
        dget(cgrp->dentry);
        css_get(css->parent);
@@ -4138,8 +4138,11 @@ static int create_css(struct cgroup *cgrp, struct cgroup_subsys *ss)
 
        return 0;
 
-err_free:
+err_clear_dir:
+       cgroup_clear_dir(css->cgroup, 1 << css->ss->subsys_id);
+err_free_percpu_ref:
        percpu_ref_cancel_init(&css->refcnt);
+err_free_css:
        ss->css_free(css);
        return err;
 }