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Commit 648bb56d authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent b48c6a80

kernel/cgroup.c

+4 −0
Original line number Diff line number Diff line
@@ -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);