1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 8588c0937a89..426bfc72b9b4 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -26,6 +26,7 @@
 #include <linux/uaccess.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <linux/usb.h>
 #include <linux/usb/tmc.h>
 
@@ -113,6 +114,7 @@ static int usbtmc_open(struct inode *inode, struct file *filp)
         struct usbtmc_device_data *data;
         int retval = 0;
 
+        lock_kernel();
         intf = usb_find_interface(&usbtmc_driver, iminor(inode));
         if (!intf) {
                 printk(KERN_ERR KBUILD_MODNAME
@@ -128,6 +130,7 @@ static int usbtmc_open(struct inode *inode, struct file *filp)
         filp->private_data = data;
 
 exit:
+        unlock_kernel();
         return retval;
 }