1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index 3d4378fb4410..94e1b84134dd 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -82,6 +82,7 @@
 #include <linux/module.h>
 #include <linux/completion.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <linux/usb.h>
 #include <linux/poll.h>
@@ -345,6 +346,7 @@ static int tower_open (struct inode *inode, struct file *file)
 
         dbg(2, "%s: enter", __func__);
 
+        lock_kernel();
         nonseekable_open(inode, file);
         subminor = iminor(inode);
 
@@ -430,6 +432,7 @@ unlock_exit:
         mutex_unlock(&dev->lock);
 
 exit:
+        unlock_kernel();
         dbg(2, "%s: leave, return value %d ", __func__, retval);
 
         return retval;