[PATCH 4.4 30/47] xhci: fix finding correct bus_state structure for USB 3.1 hosts

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>

commit 5a838a13c9b4e5dd188b7a6eaeb894e9358ead0c upstream.

xhci driver keeps a bus_state structure for each hcd (usb2 and usb3)

The structure is picked based on hcd speed, but driver only compared
for HCD_USB3 speed, returning the wrong bus_state for HCD_USB31 hosts.

This caused null pointer dereference errors in bus_resume function.

Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/host/xhci.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1490,7 +1490,7 @@ struct xhci_bus_state {
 
 static inline unsigned int hcd_index(struct usb_hcd *hcd)
 {
-	if (hcd->speed == HCD_USB3)
+	if (hcd->speed >= HCD_USB3)
 		return 0;
 	else
 		return 1;