Commit 7e9abd89 authored Jul 25, 2008 by Li Zefan Committed by Linus Torvalds Jul 25, 2008

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>

parent 9d96d82d

kernel/cgroup.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;