From 46cfeb043b04f5878154bea36714709d46028495 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 13 May 2014 12:11:00 -0400 Subject: 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 Acked-by: Li Zefan diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 3251cc9..7633703 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -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; } -- cgit v0.10.2