[PATCH] cpuset: Add a missing unlock in cpuset_write_resmask()

[Li Zefan]

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

Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
 kernel/cpuset.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 1ca786a..6272503 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1561,8 +1561,10 @@ static int cpuset_write_resmask(struct cgroup *cgrp, struct cftype *cft,
 		return -ENODEV;
 
 	trialcs = alloc_trial_cpuset(cs);
-	if (!trialcs)
+	if (!trialcs) {
+		cgroup_unlock();
 		return -ENOMEM;
+	}
 
 	switch (cft->private) {
 	case FILE_CPULIST:
-- 
1.7.3.1
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