xhci: Fix a race in usb2 LPM resume, blocking U3 for usb2 devices

commit dad67d5f upstream.

Clear device initiated resume variables once device is fully up and running
in U0 state.

Resume needs to be signaled for 20ms for usb2 devices before they can be
moved to U0 state.

An interrupt is triggered if a device initiates resume. As we handle the
event in interrupt context we can not sleep for 20ms, so we instead set
a resume flag, a timestamp, and start the roothub polling.

The roothub code will later move the port to U0 when it finds a port in
resume state with the resume flag set, and timestamp passed by 20ms.

A host initiated resume is however not done in interrupt context, and
host initiated resume code will directly signal resume, wait 20ms and then
move the port to U0.

These two codepaths can race, if we are in the middle of a host initated
resume, while sleeping for 20ms, we may handle a port event and find the
port in resume state. The port event handling code will assume the resume
was device initiated and set the resume flag and timestamp.

Root hub code will however not catch the port in resume state again as the
host initated resume code has already moved the port to U0.
The resume flag and timestamp will remain set for this port preventing port
from suspending again  (LPM setting port to U3)

Fix this for now by always clearing the device initated resume parameters
once port is in U0
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

drivers/usb/host/xhci-hub.c

@@ -658,13 +658,16 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
 			status |= USB_PORT_STAT_SUSPEND;
 		}
 	}
-	if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0
-			&& (raw_port_status & PORT_POWER)
-			&& (bus_state->suspended_ports & (1 << wIndex))) {
+	if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0 &&
+	    (raw_port_status & PORT_POWER)) {
+		if (bus_state->suspended_ports & (1 << wIndex)) {
 			bus_state->suspended_ports &= ~(1 << wIndex);
 			if (hcd->speed != HCD_USB3)
 				bus_state->port_c_suspend |= 1 << wIndex;
 		}
+		bus_state->resume_done[wIndex] = 0;
+		clear_bit(wIndex, &bus_state->resuming_ports);
+	}
 	if (raw_port_status & PORT_CONNECT) {
 		status |= USB_PORT_STAT_CONNECTION;
 		status |= xhci_port_speed(raw_port_status);