diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index a866389..e79bbae 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -57,16 +57,11 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc)
 	s64 ret;
 	int cpu;
 
-	spin_lock(&fbc->lock);
 	ret = fbc->count;
 	for_each_online_cpu(cpu) {
 		s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
 		ret += *pcount;
-		*pcount = 0;
 	}
-	fbc->count = ret;
-
-	spin_unlock(&fbc->lock);
 	return ret;
 }
 EXPORT_SYMBOL(__percpu_counter_sum);