[01/17] cpuset: add a missing unlock in cpuset_write_resmask()

[Greg KH <gregkh@suse.de>]

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Li Zefan <lizf@cn.fujitsu.com>

commit b75f38d659e6fc747eda64cb72f3920e29dd44a4 upstream.

Don't forget to release cgroup_mutex if alloc_trial_cpuset() fails.

[akpm@linux-foundation.org: avoid multiple return points]
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 kernel/cpuset.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1514,8 +1514,10 @@ static int cpuset_write_resmask(struct c
 		return -ENODEV;
 
 	trialcs = alloc_trial_cpuset(cs);
-	if (!trialcs)
-		return -ENOMEM;
+	if (!trialcs) {
+		retval = -ENOMEM;
+		goto out;
+	}
 
 	switch (cft->private) {
 	case FILE_CPULIST:
@@ -1530,6 +1532,7 @@ static int cpuset_write_resmask(struct c
 	}
 
 	free_trial_cpuset(trialcs);
+out:
 	cgroup_unlock();
 	return retval;
 }