usbfs micro optimitation

the memory barrier is needed only with smp.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index e023f3d..927a181 100644 (file)
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -580,7 +580,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
        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: