1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/usb/misc/rio500.c b/drivers/usb/misc/rio500.c
index 47ce46bb5b01..a85771b1563d 100644
--- a/drivers/usb/misc/rio500.c
+++ b/drivers/usb/misc/rio500.c
@@ -77,11 +77,14 @@ static struct rio_usb_data rio_instance;
 static int open_rio(struct inode *inode, struct file *file)
 {
         struct rio_usb_data *rio = &rio_instance;
+
+        /* against disconnect() */
         lock_kernel();
         mutex_lock(&(rio->lock));
 
         if (rio->isopen || !rio->present) {
                 mutex_unlock(&(rio->lock));
+                unlock_kernel();
                 return -EBUSY;
         }
         rio->isopen = 1;
@@ -116,7 +119,6 @@ static long ioctl_rio(struct file *file, unsigned int cmd, unsigned long arg)
         int retries;
         int retval=0;
 
-        lock_kernel();
         mutex_lock(&(rio->lock));
         /* Sanity check to make sure rio is connected, powered, etc */
         if (rio->present == 0 || rio->rio_dev == NULL) {
@@ -255,7 +257,6 @@ static long ioctl_rio(struct file *file, unsigned int cmd, unsigned long arg)
 
 err_out:
         mutex_unlock(&(rio->lock));
-        unlock_kernel();
         return retval;
 }
 
@@ -490,6 +491,7 @@ static void disconnect_rio(struct usb_interface *intf)
         struct rio_usb_data *rio = usb_get_intfdata (intf);
 
         usb_set_intfdata (intf, NULL);
+        lock_kernel();
         if (rio) {
                 usb_deregister_dev(intf, &usb_rio_class);
 
@@ -499,6 +501,7 @@ static void disconnect_rio(struct usb_interface *intf)
                         /* better let it finish - the release will do whats needed */
                         rio->rio_dev = NULL;
                         mutex_unlock(&(rio->lock));
+                        unlock_kernel();
                         return;
                 }
                 kfree(rio->ibuf);
@@ -509,6 +512,7 @@ static void disconnect_rio(struct usb_interface *intf)
                 rio->present = 0;
                 mutex_unlock(&(rio->lock));
         }
+        unlock_kernel();
 }
 
 static const struct usb_device_id rio_table[] = {