[PATCH] UHCI: add missing memory barriers

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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index ed550132db0b..79efaf7d86a3 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -717,6 +717,7 @@ static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message)
          * 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 *hcd)
          * 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;