1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 9b43ae94beba..2bd72aa34c59 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/completion.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
@@ -775,6 +776,7 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
         struct dcssblk_dev_info *dev_info;
         int rc;
 
+        lock_kernel();
         dev_info = bdev->bd_disk->private_data;
         if (NULL == dev_info) {
                 rc = -ENODEV;
@@ -784,6 +786,7 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
         bdev->bd_block_size = 4096;
         rc = 0;
 out:
+        unlock_kernel();
         return rc;
 }
 
@@ -794,6 +797,7 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
         struct segment_info *entry;
         int rc;
 
+        lock_kernel();
         if (!dev_info) {
                 rc = -ENODEV;
                 goto out;
@@ -811,6 +815,7 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
         up_write(&dcssblk_devices_sem);
         rc = 0;
 out:
+        unlock_kernel();
         return rc;
 }