Commit 46cfeb04 authored May 13, 2014 by Tejun Heo

cgroup: use release_agent_path_lock in cgroup_release_agent_show()



release_path is now protected by release_agent_path_lock to allow
accessing it without grabbing cgroup_mutex; however,
cgroup_release_agent_show() was still grabbing cgroup_mutex.  Let's
convert it to release_agent_path_lock so that we don't have to worry
about this one for the planned locking updates.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

parent 7d331fa9

kernel/cgroup.c

+2 −3

Original line number	Diff line number	Diff line
		@@ -2373,11 +2373,10 @@ static int cgroup_release_agent_show(struct seq_file seq, void v)
		{
		struct cgroup *cgrp = seq_css(seq)->cgroup;

		if (!cgroup_lock_live_group(cgrp))
		return -ENODEV;
		spin_lock(&release_agent_path_lock);
		seq_puts(seq, cgrp->root->release_agent_path);
		spin_unlock(&release_agent_path_lock);
		seq_putc(seq, '\n');
		mutex_unlock(&cgroup_mutex);
		return 0;
		}