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| author |   Tejun Heo <tj@kernel.org> | 2012-11-19 08:13:36 -0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-11-19 08:13:36 -0800 |
| commit | 648bb56d076bde31113f09a7d24d95bc8d4155ac (patch) | |
| tree | 5e17d543a77f3783e4cfce7f525f4c3255238c07 /kernel/cgroup.c | |
| parent | cgroup: trivial cleanup for cgroup_init/load_subsys() (diff) | |
| download | linux-dev-648bb56d076bde31113f09a7d24d95bc8d4155ac.tar.xz linux-dev-648bb56d076bde31113f09a7d24d95bc8d4155ac.zip | |
cgroup: lock cgroup_mutex in cgroup_init_subsys()
Make cgroup_init_subsys() grab cgroup_mutex while initializing a
subsystem so that all helpers and callbacks are called under the
context they expect. This isn't strictly necessary as
cgroup_init_subsys() doesn't race with anybody but will allow adding
lockdep assertions.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 6cc693b91c4a..09751657abdc 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4317,6 +4317,8 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss) printk(KERN_INFO "Initializing cgroup subsys %s\n", ss->name); + mutex_lock(&cgroup_mutex); + /* init base cftset */ cgroup_init_cftsets(ss); @@ -4346,6 +4348,8 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss) if (ss->post_create) ss->post_create(dummytop); + mutex_unlock(&cgroup_mutex); + /* this function shouldn't be used with modular subsystems, since they * need to register a subsys_id, among other things */ BUG_ON(ss->module); |