1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 097da8ce6be..b7de02525ec 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/blkdev.h>
+#include <linux/smp_lock.h>
 #include <linux/interrupt.h>
 #include <linux/buffer_head.h>
 #include <linux/kernel.h>
@@ -361,6 +362,7 @@ tapeblock_open(struct block_device *bdev, fmode_t mode)
         struct tape_device *    device;
         int                     rc;
 
+        lock_kernel();
         device = tape_get_device(disk->private_data);
 
         if (device->required_tapemarks) {
@@ -384,12 +386,14 @@ tapeblock_open(struct block_device *bdev, fmode_t mode)
          *       is called.
          */
         tape_state_set(device, TS_BLKUSE);
+        unlock_kernel();
         return 0;
 
 release:
         tape_release(device);
  put_device:
         tape_put_device(device);
+        unlock_kernel();
         return rc;
 }
 
@@ -403,10 +407,12 @@ static int
 tapeblock_release(struct gendisk *disk, fmode_t mode)
 {
         struct tape_device *device = disk->private_data;
-
+ 
+        lock_kernel();
         tape_state_set(device, TS_IN_USE);
         tape_release(device);
         tape_put_device(device);
+        unlock_kernel();
 
         return 0;
 }