diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c
index a6afd15..fe85871 100644
--- a/drivers/usb/misc/adutux.c
+++ b/drivers/usb/misc/adutux.c
@@ -213,7 +213,7 @@
 
 	if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
 		if (dev->read_buffer_length <
-		    (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) -
+		    (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) -
 		     (urb->actual_length)) {
 			memcpy (dev->read_buffer_primary +
 				dev->read_buffer_length,
@@ -315,7 +315,7 @@
 			 usb_rcvintpipe(dev->udev,
 					dev->interrupt_in_endpoint->bEndpointAddress),
 			 dev->interrupt_in_buffer,
-			 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+			 usb_endpoint_maxp(dev->interrupt_in_endpoint),
 			 adu_interrupt_in_callback, dev,
 			 dev->interrupt_in_endpoint->bInterval);
 	dev->read_urb_finished = 0;
@@ -483,7 +483,7 @@
 							 usb_rcvintpipe(dev->udev,
 							 		dev->interrupt_in_endpoint->bEndpointAddress),
 							 dev->interrupt_in_buffer,
-							 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+							 usb_endpoint_maxp(dev->interrupt_in_endpoint),
 							 adu_interrupt_in_callback,
 							 dev,
 							 dev->interrupt_in_endpoint->bInterval);
@@ -536,7 +536,7 @@
 				 usb_rcvintpipe(dev->udev,
 				 		dev->interrupt_in_endpoint->bEndpointAddress),
 				dev->interrupt_in_buffer,
-				le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+				usb_endpoint_maxp(dev->interrupt_in_endpoint),
 				adu_interrupt_in_callback,
 				dev,
 				dev->interrupt_in_endpoint->bInterval);
@@ -622,7 +622,7 @@
 			dbg(4," %s : sending, count = %Zd", __func__, count);
 
 			/* write the data into interrupt_out_buffer from userspace */
-			buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
+			buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
 			bytes_to_write = count > buffer_size ? buffer_size : count;
 			dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd",
 			    __func__, buffer_size, count, bytes_to_write);
@@ -752,8 +752,8 @@
 		goto error;
 	}
 
-	in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
-	out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
+	in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
+	out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
 
 	dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
 	if (!dev->read_buffer_primary) {