diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
index ef36f213..b5ecd59 100644
--- a/drivers/s390/char/fs3270.c
+++ b/drivers/s390/char/fs3270.c
@@ -14,6 +14,7 @@
 #include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/types.h>
+#include <linux/smp_lock.h>
 
 #include <asm/ccwdev.h>
 #include <asm/cio.h>
@@ -421,6 +422,7 @@
 
 	if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR)
 		return -ENODEV;
+	lock_kernel();
 	minor = iminor(filp->f_path.dentry->d_inode);
 	/* Check for minor 0 multiplexer. */
 	if (minor == 0) {
@@ -429,7 +431,8 @@
 		tty = get_current_tty();
 		if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
 			mutex_unlock(&tty_mutex);
-			return -ENODEV;
+			rc = -ENODEV;
+			goto out;
 		}
 		minor = tty->index + RAW3270_FIRSTMINOR;
 		mutex_unlock(&tty_mutex);
@@ -438,19 +441,22 @@
 	fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
 	if (!IS_ERR(fp)) {
 		raw3270_put_view(&fp->view);
-		return -EBUSY;
+		rc = -EBUSY;
+		goto out;
 	}
 	/* Allocate fullscreen view structure. */
 	fp = fs3270_alloc_view();
-	if (IS_ERR(fp))
-		return PTR_ERR(fp);
+	if (IS_ERR(fp)) {
+		rc = PTR_ERR(fp);
+		goto out;
+	}
 
 	init_waitqueue_head(&fp->wait);
 	fp->fs_pid = get_pid(task_pid(current));
 	rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
 	if (rc) {
 		fs3270_free_view(&fp->view);
-		return rc;
+		goto out;
 	}
 
 	/* Allocate idal-buffer. */
@@ -458,7 +464,8 @@
 	if (IS_ERR(ib)) {
 		raw3270_put_view(&fp->view);
 		raw3270_del_view(&fp->view);
-		return PTR_ERR(fp);
+		rc = PTR_ERR(fp);
+		goto out;
 	}
 	fp->rdbuf = ib;
 
@@ -466,9 +473,11 @@
 	if (rc) {
 		raw3270_put_view(&fp->view);
 		raw3270_del_view(&fp->view);
-		return rc;
+		goto out;
 	}
 	filp->private_data = fp;
+out:
+	unlock_kernel();
 	return 0;
 }
 
diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c
index ebe8406..687720b 100644
--- a/drivers/s390/char/tape_char.c
+++ b/drivers/s390/char/tape_char.c
@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/proc_fs.h>
 #include <linux/mtio.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -289,21 +290,26 @@
 	if (imajor(filp->f_path.dentry->d_inode) != tapechar_major)
 		return -ENODEV;
 
+	lock_kernel();
 	minor = iminor(filp->f_path.dentry->d_inode);
 	device = tape_get_device(minor / TAPE_MINORS_PER_DEV);
 	if (IS_ERR(device)) {
 		DBF_EVENT(3, "TCHAR:open: tape_get_device() failed\n");
-		return PTR_ERR(device);
+		rc = PTR_ERR(device);
+		goto out;
 	}
 
 
 	rc = tape_open(device);
 	if (rc == 0) {
 		filp->private_data = device;
-		return nonseekable_open(inode, filp);
+		rc = nonseekable_open(inode, filp);
 	}
-	tape_put_device(device);
+	else
+		tape_put_device(device);
 
+out:
+	unlock_kernel();
 	return rc;
 }
 
diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
index e848734..d101328 100644
--- a/drivers/s390/char/vmlogrdr.c
+++ b/drivers/s390/char/vmlogrdr.c
@@ -25,6 +25,7 @@
 #include <linux/kmod.h>
 #include <linux/cdev.h>
 #include <linux/device.h>
+#include <linux/smp_lock.h>
 #include <linux/string.h>
 
 
@@ -319,9 +320,11 @@
 		return -ENOSYS;
 
 	/* Besure this device hasn't already been opened */
+	lock_kernel();
 	spin_lock_bh(&logptr->priv_lock);
 	if (logptr->dev_in_use)	{
 		spin_unlock_bh(&logptr->priv_lock);
+		unlock_kernel();
 		return -EBUSY;
 	}
 	logptr->dev_in_use = 1;
@@ -365,7 +368,9 @@
 		   || (logptr->iucv_path_severed));
 	if (logptr->iucv_path_severed)
 		goto out_record;
- 	return nonseekable_open(inode, filp);
+ 	ret = nonseekable_open(inode, filp);
+	unlock_kernel();
+	return ret;
 
 out_record:
 	if (logptr->autorecording)
@@ -375,6 +380,7 @@
 	logptr->path = NULL;
 out_dev:
 	logptr->dev_in_use = 0;
+	unlock_kernel();
 	return -EIO;
 }
 
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
index 83ae9a8..6154998 100644
--- a/drivers/s390/char/vmur.c
+++ b/drivers/s390/char/vmur.c
@@ -9,6 +9,7 @@
  */
 
 #include <linux/cdev.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/cio.h>
@@ -668,7 +669,7 @@
 
 	if (accmode == O_RDWR)
 		return -EACCES;
-
+	lock_kernel();
 	/*
 	 * We treat the minor number as the devno of the ur device
 	 * to find in the driver tree.
@@ -676,8 +677,10 @@
 	devno = MINOR(file->f_dentry->d_inode->i_rdev);
 
 	urd = urdev_get_from_devno(devno);
-	if (!urd)
-		return -ENXIO;
+	if (!urd) {
+		rc = -ENXIO;
+		goto out;
+	}
 
 	spin_lock(&urd->open_lock);
 	while (urd->open_flag) {
@@ -720,6 +723,7 @@
 		goto fail_urfile_free;
 	urf->file_reclen = rc;
 	file->private_data = urf;
+	unlock_kernel();
 	return 0;
 
 fail_urfile_free:
@@ -730,6 +734,8 @@
 	spin_unlock(&urd->open_lock);
 fail_put:
 	urdev_put(urd);
+out:
+	unlock_kernel();
 	return rc;
 }