diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 72f1c14..81e3a42 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -714,7 +714,7 @@
 			goto unknown;
 		}
 		/* unblock posted writes */
-		ehci_readl(&ehci->hcor->or_usbcmd);
+		(void) ehci_readl(&ehci->hcor->or_usbcmd);
 		break;
 	case USB_REQ_CLEAR_FEATURE | ((USB_DIR_OUT | USB_RT_PORT) << 8):
 		reg = ehci_readl(status_reg);
@@ -743,7 +743,7 @@
 		}
 		ehci_writel(status_reg, reg);
 		/* unblock posted write */
-		ehci_readl(&ehci->hcor->or_usbcmd);
+		(void) ehci_readl(&ehci->hcor->or_usbcmd);
 		break;
 	default:
 		debug("Unknown request\n");