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Merge branch 'for-3.13-fixes' into for-3.14 

Pulling in as patches depending on 266ccd505e ("cgroup: fix
cgroup_create() error handling path") are scheduled.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2013-12-06 15:09:27 -05:00
parent 6612f05b88 266ccd505e
commit e58e1ca438
1 changed files with 21 additions and 10 deletions
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31
kernel/cgroup.c
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@ -4162,14 +4162,6 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
list_add_tail_rcu(&cgrp->sibling, &cgrp->parent->children);
root->number_of_cgroups++;
/* each css holds a ref to the cgroup's dentry and the parent css */
for_each_root_subsys(root, ss) {
struct cgroup_subsys_state *css = css_ar[ss->subsys_id];
dget(dentry);
css_get(css->parent);
}
/* hold a ref to the parent's dentry */
dget(parent->dentry);
@ -4181,6 +4173,13 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
if (err)
goto err_destroy;
/* each css holds a ref to the cgroup's dentry and parent css */
dget(dentry);
css_get(css->parent);
/* mark it consumed for error path */
css_ar[ss->subsys_id] = NULL;
if (ss->broken_hierarchy && !ss->warned_broken_hierarchy &&
parent->parent) {
pr_warning("cgroup: %s (%d) created nested cgroup for controller \"%s\" which has incomplete hierarchy support. Nested cgroups may change behavior in the future.\n",
@ -4227,6 +4226,14 @@ err_free_cgrp:
return err;
err_destroy:
for_each_root_subsys(root, ss) {
struct cgroup_subsys_state *css = css_ar[ss->subsys_id];
if (css) {
percpu_ref_cancel_init(&css->refcnt);
ss->css_free(css);
}
}
cgroup_destroy_locked(cgrp);
mutex_unlock(&cgroup_mutex);
mutex_unlock(&dentry->d_inode->i_mutex);
@ -4387,8 +4394,12 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
* will be invoked to perform the rest of destruction once the
* percpu refs of all css's are confirmed to be killed.
*/
for_each_root_subsys(cgrp->root, ss)
kill_css(cgroup_css(cgrp, ss));
for_each_root_subsys(cgrp->root, ss) {
struct cgroup_subsys_state *css = cgroup_css(cgrp, ss);
if (css)
kill_css(css);
}
/*
* Mark @cgrp dead. This prevents further task migration and child