diff --git a/drivers/media/usb/siano/smsusb.c b/drivers/media/usb/siano/smsusb.c
index dbc7cd6c450fc7aaef0ac9298a106f11bc00d6e2..3071d9bc77f48827e4c1fda351808da1c3886307 100644
--- a/drivers/media/usb/siano/smsusb.c
+++ b/drivers/media/usb/siano/smsusb.c
@@ -401,7 +401,7 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 	struct smsusb_device_t *dev;
 	void *mdev;
 	int i, rc;
-	int in_maxp = 0;
+	int align = 0;
 
 	/* create device object */
 	dev = kzalloc(sizeof(struct smsusb_device_t), GFP_KERNEL);
@@ -419,14 +419,14 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 
 		if (desc->bEndpointAddress & USB_DIR_IN) {
 			dev->in_ep = desc->bEndpointAddress;
-			in_maxp = usb_endpoint_maxp(desc);
+			align = usb_endpoint_maxp(desc) - sizeof(struct sms_msg_hdr);
 		} else {
 			dev->out_ep = desc->bEndpointAddress;
 		}
 	}
 
 	pr_debug("in_ep = %02x, out_ep = %02x\n", dev->in_ep, dev->out_ep);
-	if (!dev->in_ep || !dev->out_ep) {	/* Missing endpoints? */
+	if (!dev->in_ep || !dev->out_ep || align < 0) {  /* Missing endpoints? */
 		smsusb_term_device(intf);
 		return -ENODEV;
 	}
@@ -445,7 +445,7 @@ static int smsusb_init_device(struct usb_interface *intf, int board_id)
 		/* fall-thru */
 	default:
 		dev->buffer_size = USB2_BUFFER_SIZE;
-		dev->response_alignment = in_maxp - sizeof(struct sms_msg_hdr);
+		dev->response_alignment = align;
 
 		params.flags |= SMS_DEVICE_FAMILY2;
 		break;