1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c
index 306e97825b36..ac8ad91c2dac 100644
--- a/drivers/usb/misc/adutux.c
+++ b/drivers/usb/misc/adutux.c
@@ -25,6 +25,7 @@
 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 #ifdef CONFIG_USB_DEBUG
@@ -274,6 +275,7 @@ static int adu_open(struct inode *inode, struct file *file)
 
         dbg(2,"%s : enter", __func__);
 
+        lock_kernel();
         subminor = iminor(inode);
 
         if ((retval = mutex_lock_interruptible(&adutux_mutex))) {
@@ -332,6 +334,7 @@ static int adu_open(struct inode *inode, struct file *file)
 exit_no_device:
         mutex_unlock(&adutux_mutex);
 exit_no_lock:
+        unlock_kernel();
         dbg(2,"%s : leave, return value %d ", __func__, retval);
         return retval;
 }