Merge branch 'nfsd-next' of git://linux-nfs.org/~bfields/linux

[~andy/linux] / kernel / cgroup.c

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 68d87103b493a3bc104771b02cf3d46197699be7..0c753ddd223bf9d543dfbb2d89915a08ab537f46 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2905,9 +2905,14 @@ static void cgroup_enable_task_cg_lists(void)
                 * We should check if the process is exiting, otherwise
                 * it will race with cgroup_exit() in that the list
                 * entry won't be deleted though the process has exited.
+                * Do it while holding siglock so that we don't end up
+                * racing against cgroup_exit().
                 */
+               spin_lock_irq(&p->sighand->siglock);
                if (!(p->flags & PF_EXITING) && list_empty(&p->cg_list))
                        list_add(&p->cg_list, &task_css_set(p)->tasks);
+               spin_unlock_irq(&p->sighand->siglock);
+
                task_unlock(p);
        } while_each_thread(g, p);
        read_unlock(&tasklist_lock);
@@ -4107,17 +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);
@@ -4133,8 +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;
 }