USB: EHCI: fix handover for designated full-speed ports

This patch (as895) fixes up a loose end in the port-handover code for
the USB-Persist facility.  A special case occurs when a high-speed
device is attached to a port which the user has designated to run at
full-speed only; the port must be disabled before the handover can
take place.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-hub.c

@@ -60,11 +60,13 @@ static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
 	while (port--) {
 		if (test_bit(port, &ehci->owned_ports)) {
 			reg = &ehci->regs->port_status[port];
-			status = ehci_readl(ehci, reg);
+			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 
 			/* Port already owned by companion? */
 			if (status & PORT_OWNER)
 				clear_bit(port, &ehci->owned_ports);
+			else if (test_bit(port, &ehci->companion_ports))
+				ehci_writel(ehci, status & ~PORT_PE, reg);
 			else
 				ehci_hub_control(hcd, SetPortFeature,
 						USB_PORT_FEAT_RESET, port + 1,