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>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index e023f3d5624..927a181120a 100644
--- 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: