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cgroup: allow ->post_create() to fail

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There could be cases where controllers want to do initialization
operations which may fail from ->post_create().  This patch makes
->post_create() return -errno to indicate failure and online_css()
relay such failures.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Glauber Costa <glommer@parallels.com>
This commit is contained in:
Tejun Heo 2012-11-19 08:13:38 -08:00
parent 4b8b47eb00
commit b1929db42f
3 changed files with 23 additions and 12 deletions
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4
kernel/cgroup_freezer.c
View file

@ -112,7 +112,7 @@ static struct cgroup_subsys_state *freezer_create(struct cgroup *cgroup)
* parent's freezing state while holding both parent's and our
* freezer->lock.
*/
static void freezer_post_create(struct cgroup *cgroup)
static int freezer_post_create(struct cgroup *cgroup)
{
struct freezer *freezer = cgroup_freezer(cgroup);
struct freezer *parent = parent_freezer(freezer);
@ -136,6 +136,8 @@ static void freezer_post_create(struct cgroup *cgroup)
spin_unlock(&freezer->lock);
if (parent)
spin_unlock_irq(&parent->lock);
return 0;
}
/**