1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
index a246bc73ae64..c31faefa2b3b 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>
 
 
@@ -310,9 +311,11 @@ static int vmlogrdr_open (struct inode *inode, struct file *filp)
                 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;
@@ -356,7 +359,9 @@ static int vmlogrdr_open (struct inode *inode, struct file *filp)
                    || (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)
@@ -366,6 +371,7 @@ out_path:
         logptr->path = NULL;
 out_dev:
         logptr->dev_in_use = 0;
+        unlock_kernel();
         return -EIO;
 }