Merge branch 'master' into gfs2

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c
index c545ef92fe29..16fb72eb6fc9 100644
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -84,6 +84,7 @@ static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
                 unsigned long port_addr)
 {
         int status;
+        int i;
 
         if (inw(port_addr) & (USBPORTSC_SUSP | USBPORTSC_RD)) {
                 CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD);
@@ -92,9 +93,14 @@ static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
 
                 /* The controller won't actually turn off the RD bit until
                  * it has had a chance to send a low-speed EOP sequence,
-                 * which takes 3 bit times (= 2 microseconds).  We'll delay
-                 * slightly longer for good luck. */
-                udelay(4);
+                 * which is supposed to take 3 bit times (= 2 microseconds).
+                 * Experiments show that some controllers take longer, so
+                 * we'll poll for completion. */
+                for (i = 0; i < 10; ++i) {
+                        if (!(inw(port_addr) & USBPORTSC_RD))
+                                break;
+                        udelay(1);
+                }
         }
         clear_bit(port, &uhci->resuming_ports);
 }