From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Paul Menage <menage@google.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Containers <containers@lists.linux-foundation.org>
Subject: [PATCH] cgroups: use task_lock() for access tsk->cgroups safe in cgroup_clone()
Date: Fri, 21 Nov 2008 16:49:55 +0800 [thread overview]
Message-ID: <49267633.8040607@cn.fujitsu.com> (raw)
use task_lock() protect tsk->cgroups and get_css_set(tsk->cgroups)
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 358e775..ddc10ac 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2933,6 +2943,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
mutex_unlock(&cgroup_mutex);
return 0;
}
+ task_lock(tsk);
cg = tsk->cgroups;
parent = task_cgroup(tsk, subsys->subsys_id);
@@ -2941,6 +2952,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
/* Keep the cgroup alive */
get_css_set(cg);
+ task_unlock(tsk);
mutex_unlock(&cgroup_mutex);
/* Now do the VFS work to create a cgroup */
next reply other threads:[~2008-11-21 8:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-21 8:49 Lai Jiangshan [this message]
2008-11-21 19:18 ` [PATCH] cgroups: use task_lock() for access tsk->cgroups safe in cgroup_clone() Paul Menage
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