xhci: Add defines for hardcoded slot states

This needs to be added to the stable trees back to 2.6.34 to support an
upcoming bug fix.
Signed-off-by: Maarten Lankhorst <m.b.lankhorst@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@kernel.org

drivers/usb/host/xhci-dbg.c

@@ -438,13 +438,13 @@ char *xhci_get_slot_state(struct xhci_hcd *xhci,
 	struct xhci_slot_ctx *slot_ctx = xhci_get_slot_ctx(xhci, ctx);
 
 	switch (GET_SLOT_STATE(le32_to_cpu(slot_ctx->dev_state))) {
-	case 0:
+	case SLOT_STATE_ENABLED:
 		return "enabled/disabled";
-	case 1:
+	case SLOT_STATE_DEFAULT:
 		return "default";
-	case 2:
+	case SLOT_STATE_ADDRESSED:
 		return "addressed";
-	case 3:
+	case SLOT_STATE_CONFIGURED:
 		return "configured";
 	default:
 		return "reserved";

drivers/usb/host/xhci.h

@@ -560,6 +560,11 @@ struct xhci_slot_ctx {
 #define SLOT_STATE	(0x1f << 27)
 #define GET_SLOT_STATE(p)	(((p) & (0x1f << 27)) >> 27)
 
+#define SLOT_STATE_DISABLED	0
+#define SLOT_STATE_ENABLED	SLOT_STATE_DISABLED
+#define SLOT_STATE_DEFAULT	1
+#define SLOT_STATE_ADDRESSED	2
+#define SLOT_STATE_CONFIGURED	3
 
 /**
  * struct xhci_ep_ctx