1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
index 8b9549ab4a4e..314333db16ee 100644
--- a/drivers/block/paride/pt.c
+++ b/drivers/block/paride/pt.c
@@ -146,6 +146,7 @@ static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
 #include <linux/mtio.h>
 #include <linux/device.h>
 #include <linux/sched.h>        /* current, TASK_*, schedule_timeout() */
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -650,8 +651,11 @@ static int pt_open(struct inode *inode, struct file *file)
         struct pt_unit *tape = pt + unit;
         int err;
 
-        if (unit >= PT_UNITS || (!tape->present))
+        lock_kernel();
+        if (unit >= PT_UNITS || (!tape->present)) {
+                unlock_kernel();
                 return -ENODEV;
+        }
 
         err = -EBUSY;
         if (!atomic_dec_and_test(&tape->available))
@@ -678,10 +682,12 @@ static int pt_open(struct inode *inode, struct file *file)
         }
 
         file->private_data = tape;
+        unlock_kernel();
         return 0;
 
 out:
         atomic_inc(&tape->available);
+        unlock_kernel();
         return err;
 }