From: Oliver Neukum <oliver@neukum.org>
Date: Fri, 20 Apr 2007 18:50:48 +0000 (+0200)
Subject: usbfs micro optimitation
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=527660a819f513edc52fea6bcb4068ce1d4d966b;p=deliverable%2Flinux.git

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 e023f3d56248..927a181120a9 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: