Commit 7e9abd89 authored by Li Zefan's avatar Li Zefan Committed by 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: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarPaul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9d96d82d
...@@ -415,11 +415,11 @@ static struct css_set *find_css_set( ...@@ -415,11 +415,11 @@ static struct css_set *find_css_set(
/* First see if we already have a cgroup group that matches /* First see if we already have a cgroup group that matches
* the desired set */ * the desired set */
write_lock(&css_set_lock); read_lock(&css_set_lock);
res = find_existing_css_set(oldcg, cgrp, template); res = find_existing_css_set(oldcg, cgrp, template);
if (res) if (res)
get_css_set(res); get_css_set(res);
write_unlock(&css_set_lock); read_unlock(&css_set_lock);
if (res) if (res)
return res; return res;
......
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