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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: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2008-07-25 01:46:54 -07:00 committed by Linus Torvalds
parent 9d96d82da4
commit 7e9abd89cb
1 changed files with 2 additions and 2 deletions
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4
kernel/cgroup.c
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@ -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;