1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index cbb44b7b9d6..59fb5c677db 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1725,6 +1725,15 @@ cleanup:
         if (bogus_port_status)
                 return;
 
+        /*
+         * xHCI port-status-change events occur when the "or" of all the
+         * status-change bits in the portsc register changes from 0 to 1.
+         * New status changes won't cause an event if any other change
+         * bits are still set.  When an event occurs, switch over to
+         * polling to avoid losing status changes.
+         */
+        xhci_dbg(xhci, "%s: starting port polling.\n", __func__);
+        set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
         spin_unlock(&xhci->lock);
         /* Pass this up to the core */
         usb_hcd_poll_rh_status(hcd);