1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 18aafcb08fc8..b75a3d8bb02f 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -19,6 +19,7 @@
 #include <linux/uaccess.h>
 #include <linux/bitops.h>
 #include <linux/poll.h>
+#include <linux/smp_lock.h>
 #include <linux/usb.h>
 #include <linux/usb/cdc.h>
 #include <asm/byteorder.h>
@@ -516,6 +517,7 @@ static int wdm_open(struct inode *inode, struct file *file)
         struct usb_interface *intf;
         struct wdm_device *desc;
 
+        lock_kernel();
         mutex_lock(&wdm_mutex);
         intf = usb_find_interface(&wdm_driver, minor);
         if (!intf)
@@ -548,6 +550,7 @@ static int wdm_open(struct inode *inode, struct file *file)
         usb_autopm_put_interface(desc->intf);
 out:
         mutex_unlock(&wdm_mutex);
+        unlock_kernel();
         return rv;
 }