[patch 4/4] UHCI: add missing memory barriers

[Greg Kroah-Hartman <gregkh@suse.de>]

From: Alan Stern <stern@rowland.harvard.edu>

This patch (as617) adds a couple of memory barriers that Ben H. forgot in
his recent suspend/resume fix.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/usb/host/uhci-hcd.c |    2 ++
 1 file changed, 2 insertions(+)

--- gregkh-2.6.orig/drivers/usb/host/uhci-hcd.c
+++ gregkh-2.6/drivers/usb/host/uhci-hcd.c
@@ -717,6 +717,7 @@ static int uhci_suspend(struct usb_hcd *
 	 * at the source, so we must turn off PIRQ.
 	 */
 	pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
+	mb();
 	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 	uhci->hc_inaccessible = 1;
 	hcd->poll_rh = 0;
@@ -738,6 +739,7 @@ static int uhci_resume(struct usb_hcd *h
 	 * really don't want to keep a stale HCD_FLAG_HW_ACCESSIBLE=0
 	 */
 	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+	mb();
 
 	if (uhci->rh_state == UHCI_RH_RESET)	/* Dead */
 		return 0;

--
-
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