[PATCH] USB usbfs: drop pointless racy check

The check of interface->dev.driver requires a lock to be taken
to protect against driver binding changes.  But in fact I think it
is better just to drop the test.  The result is that the caller is
required to claim an interface before changing the altsetting,
which is consistent with the other routines that operate on
interfaces.

 devio.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

drivers/usb/core/devio.c

@@ -747,10 +747,8 @@ static int proc_setintf(struct dev_state *ps, void __user *arg)
 	if ((ret = findintfif(ps->dev, setintf.interface)) < 0)
 		return ret;
 	interface = ps->dev->actconfig->interface[ret];
-	if (interface->dev.driver) {
-		if ((ret = checkintf(ps, ret)))
-			return ret;
-	}
+	if ((ret = checkintf(ps, ret)))
+		return ret;
 	if (usb_set_interface(ps->dev, setintf.interface, setintf.altsetting))
 		return -EINVAL;
 	return 0;