提交 7e9abd89 编写于 作者: L Li Zefan 提交者: Linus Torvalds

cgroup: use read lock to guard find_existing_css_set()

The function does not modify anything (except the temporary css template), so
it's sufficient to hold read lock.
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
Acked-by: NPaul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 9d96d82d
......@@ -415,11 +415,11 @@ static struct css_set *find_css_set(
/* First see if we already have a cgroup group that matches
* the desired set */
write_lock(&css_set_lock);
read_lock(&css_set_lock);
res = find_existing_css_set(oldcg, cgrp, template);
if (res)
get_css_set(res);
write_unlock(&css_set_lock);
read_unlock(&css_set_lock);
if (res)
return res;
......
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