3 files changed, 9 insertions, 3 deletions
diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c
index 2ed3f82e5c30..e021ec663ef9 100644
--- a/drivers/s390/char/monreader.c
+++ b/drivers/s390/char/monreader.c
@@ -627,7 +627,7 @@ out_iucv:
 static void __exit mon_exit(void)
 {
 	segment_unload(mon_dcss_name);
-	WARN_ON(misc_deregister(&mon_dev) != 0);
+	misc_deregister(&mon_dev);
 	device_unregister(monreader_device);
 	driver_unregister(&monreader_driver);
 	iucv_unregister(&monreader_iucv_handler, 1);
diff --git a/drivers/s390/char/monwriter.c b/drivers/s390/char/monwriter.c
index 98a49dfda1de..572a1e7fd099 100644
--- a/drivers/s390/char/monwriter.c
+++ b/drivers/s390/char/monwriter.c
@@ -380,7 +380,7 @@ out_driver:
 
 static void __exit mon_exit(void)
 {
-	WARN_ON(misc_deregister(&mon_dev) != 0);
+	misc_deregister(&mon_dev);
 	platform_device_unregister(monwriter_pdev);
 	platform_driver_unregister(&monwriter_pdrv);
 }
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 097da8ce6be6..b7de02525ec9 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;
 }