xhci: prevent bus_suspend if SS port resuming in phase 1

[linux-2.6-block.git] / drivers / usb / host / xhci-hub.c

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index e75c565feb53ef3022312c047268367de71ae059..fdca8edc5836fb3155796e55a3c72f643e62855c 100644 (file)
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -484,10 +484,13 @@ static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
        u32 pls = status_reg & PORT_PLS_MASK;
 
        /* resume state is a xHCI internal state.
-        * Do not report it to usb core.
+        * Do not report it to usb core, instead, pretend to be U3,
+        * thus usb core knows it's not ready for transfer
         */
-       if (pls == XDEV_RESUME)
+       if (pls == XDEV_RESUME) {
+               *status |= USB_SS_PORT_LS_U3;
                return;
+       }
 
        /* When the CAS bit is set then warm reset
         * should be performed on port
@@ -1120,10 +1123,10 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
        spin_lock_irqsave(&xhci->lock, flags);
 
        if (hcd->self.root_hub->do_remote_wakeup) {
-               if (bus_state->resuming_ports) {
+               if (bus_state->resuming_ports ||        /* USB2 */
+                   bus_state->port_remote_wakeup) {    /* USB3 */
                        spin_unlock_irqrestore(&xhci->lock, flags);
-                       xhci_dbg(xhci, "suspend failed because "
-                                               "a port is resuming\n");
+                       xhci_dbg(xhci, "suspend failed because a port is resuming\n");
                        return -EBUSY;
                }
        }