1 files changed, 3 insertions, 4 deletions

diff --git a/arch/s390/crypto/prng.c b/arch/s390/crypto/prng.c
index 0cfefddd8375..eca724d229ec 100644
--- a/arch/s390/crypto/prng.c
+++ b/arch/s390/crypto/prng.c
@@ -6,6 +6,7 @@
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/smp_lock.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
@@ -48,6 +49,7 @@ static unsigned char parm_block[32] = {
 
 static int prng_open(struct inode *inode, struct file *file)
 {
+        cycle_kernel_lock();
         return nonseekable_open(inode, file);
 }
 
@@ -185,11 +187,8 @@ static int __init prng_init(void)
         prng_seed(16);
 
         ret = misc_register(&prng_dev);
-        if (ret) {
-                printk(KERN_WARNING
-                       "Could not register misc device for PRNG.\n");
+        if (ret)
                 goto out_buf;
-        }
         return 0;
 
 out_buf: