[patch]usbfs micro optimitation

Hi,

the memory barrier is needed only with smp.

	Regards
		Oliver
Signed-off-by: Oliver Neukum <[email protected]>
----

--- a/drivers/usb/core/devio.c	2007-04-20 20:20:29.000000000 +0200
+++ b/drivers/usb/core/devio.c	2007-04-20 20:27:45.000000000 +0200
@@ -581,7 +581,7 @@ static int usbdev_open(struct inode *ino
 	ps->disccontext = NULL;
 	ps->ifclaimed = 0;
 	security_task_getsecid(current, &ps->secid);
-	wmb();
+	smp_wmb();
 	list_add_tail(&ps->list, &dev->filelist);
 	file->private_data = ps;
  out:

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