diff --git a/[refs] b/[refs]
index 99b71658c4b5..dbf865c2efce 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a46c46a1d752756ba159dd454b746a3fb735c4f5
+refs/heads/master: 4e833c0b87a30798e67f06120cecebef6ee9644c
diff --git a/trunk/drivers/usb/host/xhci-ring.c b/trunk/drivers/usb/host/xhci-ring.c
index 6bd9d53062eb..5ddc4ae85499 100644
--- a/trunk/drivers/usb/host/xhci-ring.c
+++ b/trunk/drivers/usb/host/xhci-ring.c
@@ -2417,7 +2417,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
 		u32 irq_pending;
 		/* Acknowledge the PCI interrupt */
 		irq_pending = xhci_readl(xhci, &xhci->ir_set->irq_pending);
-		irq_pending |= 0x3;
+		irq_pending |= IMAN_IP;
 		xhci_writel(xhci, irq_pending, &xhci->ir_set->irq_pending);
 	}
 
diff --git a/trunk/drivers/usb/host/xhci.h b/trunk/drivers/usb/host/xhci.h
index 91074fdab3eb..3d69c4b2b542 100644
--- a/trunk/drivers/usb/host/xhci.h
+++ b/trunk/drivers/usb/host/xhci.h
@@ -205,6 +205,10 @@ struct xhci_op_regs {
 #define CMD_PM_INDEX	(1 << 11)
 /* bits 12:31 are reserved (and should be preserved on writes). */
 
+/* IMAN - Interrupt Management Register */
+#define IMAN_IP		(1 << 1)
+#define IMAN_IE		(1 << 0)
+
 /* USBSTS - USB status - status bitmasks */
 /* HC not running - set to 1 when run/stop bit is cleared. */
 #define STS_HALT	XHCI_STS_HALT