USB: correct locking in gadgetfs_disconnect

This patch moves spin_lock (&dev->lock) before first use of dev.
I think that test to the state of device should be protected with
this spin_lock...

Signed-off-by: Milan Svoboda <msvoboda@ra.rockwell.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index 2a7162d89799..da85732fa993 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -1696,16 +1696,17 @@ gadgetfs_disconnect (struct usb_gadget *gadget)
 {
         struct dev_data         *dev = get_gadget_data (gadget);
 
+        spin_lock (&dev->lock);
         if (dev->state == STATE_UNCONNECTED) {
                 DBG (dev, "already unconnected\n");
-                return;
+                goto exit;
         }
         dev->state = STATE_UNCONNECTED;
 
         INFO (dev, "disconnected\n");
-        spin_lock (&dev->lock);
         next_event (dev, GADGETFS_DISCONNECT);
         ep0_readable (dev);
+exit:
         spin_unlock (&dev->lock);
 }