1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index 49145534e06e..293a46247c3b 100644
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -15,6 +15,7 @@
 #include <linux/poll.h>
 #include <linux/compat.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -527,14 +528,17 @@ static int mon_bin_open(struct inode *inode, struct file *file)
         size_t size;
         int rc;
 
+        lock_kernel();
         mutex_lock(&mon_lock);
         if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) {
                 mutex_unlock(&mon_lock);
+                unlock_kernel();
                 return -ENODEV;
         }
         if (mbus != &mon_bus0 && mbus->u_bus == NULL) {
                 printk(KERN_ERR TAG ": consistency error on open\n");
                 mutex_unlock(&mon_lock);
+                unlock_kernel();
                 return -ENODEV;
         }
 
@@ -568,6 +572,7 @@ static int mon_bin_open(struct inode *inode, struct file *file)
 
         file->private_data = rp;
         mutex_unlock(&mon_lock);
+        unlock_kernel();
         return 0;
 
 err_allocbuff:
@@ -576,6 +581,7 @@ err_allocvec:
         kfree(rp);
 err_alloc:
         mutex_unlock(&mon_lock);
+        unlock_kernel();
         return rc;
 }