diff --git a/[refs] b/[refs]
index 069df3d26e8b..1a3dd98b90d5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d5f4d113cb9dac182ba44eb605ec4a2f1fdfd3ec
+refs/heads/master: af6df871ba87ff93739babb16d26160c37c43183
diff --git a/trunk/drivers/s390/cio/qdio_debug.c b/trunk/drivers/s390/cio/qdio_debug.c
index f8b03a636e49..0e615cb912d0 100644
--- a/trunk/drivers/s390/cio/qdio_debug.c
+++ b/trunk/drivers/s390/cio/qdio_debug.c
@@ -188,19 +188,13 @@ static ssize_t qperf_seq_write(struct file *file, const char __user *ubuf,
 	struct qdio_irq *irq_ptr = seq->private;
 	struct qdio_q *q;
 	unsigned long val;
-	char buf[8];
 	int ret, i;
 
 	if (!irq_ptr)
 		return 0;
-	if (count >= sizeof(buf))
-		return -EINVAL;
-	if (copy_from_user(&buf, ubuf, count))
-		return -EFAULT;
-	buf[count] = 0;
-
-	ret = strict_strtoul(buf, 10, &val);
-	if (ret < 0)
+
+	ret = kstrtoul_from_user(ubuf, count, 10, &val);
+	if (ret)
 		return ret;
 
 	switch (val) {