xhci: Rename variables related to transfer descritpors

urb_priv structure has a count on how many TDs the
URB contains, and how many of those TD's we have handled.

rename:
length -> num_tds
td_cnt -> num_tds_done

No functional changes
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-ring.c

@@ -119,14 +119,14 @@ static bool last_td_in_urb(struct xhci_td *td)
 {
 	struct urb_priv *urb_priv = td->urb->hcpriv;
 
-	return urb_priv->td_cnt == urb_priv->length;
+	return urb_priv->num_tds_done == urb_priv->num_tds;
 }
 
 static void inc_td_cnt(struct urb *urb)
 {
 	struct urb_priv *urb_priv = urb->hcpriv;
 
-	urb_priv->td_cnt++;
+	urb_priv->num_tds_done++;
 }
 
 static void trb_to_noop(union xhci_trb *trb, u32 noop_type)
@@ -2055,7 +2055,7 @@ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
 	ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
 	trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
 	urb_priv = td->urb->hcpriv;
-	idx = urb_priv->td_cnt;
+	idx = urb_priv->num_tds_done;
 	frame = &td->urb->iso_frame_desc[idx];
 	requested = frame->length;
 	remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
@@ -2134,7 +2134,7 @@ static int skip_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td,
 
 	ep_ring = xhci_dma_to_transfer_ring(ep, le64_to_cpu(event->buffer));
 	urb_priv = td->urb->hcpriv;
-	idx = urb_priv->td_cnt;
+	idx = urb_priv->num_tds_done;
 	frame = &td->urb->iso_frame_desc[idx];
 
 	/* The transfer is partly done. */
@@ -3131,7 +3131,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
 	urb_priv = urb->hcpriv;
 
 	/* Deal with URB_ZERO_PACKET - need one more td/trb */
-	if (urb->transfer_flags & URB_ZERO_PACKET && urb_priv->length > 1)
+	if (urb->transfer_flags & URB_ZERO_PACKET && urb_priv->num_tds > 1)
 		need_zero_pkt = true;
 
 	td = urb_priv->td[0];

drivers/usb/host/xhci.c

@@ -1379,8 +1379,8 @@ int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
 		buffer++;
 	}
 
-	urb_priv->length = num_tds;
-	urb_priv->td_cnt = 0;
+	urb_priv->num_tds = num_tds;
+	urb_priv->num_tds_done = 0;
 	urb->hcpriv = urb_priv;
 
 	trace_xhci_urb_enqueue(urb);
@@ -1523,8 +1523,8 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 		xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
 				"HW died, freeing TD.");
 		urb_priv = urb->hcpriv;
-		for (i = urb_priv->td_cnt;
-		     i < urb_priv->length && xhci->devs[urb->dev->slot_id];
+		for (i = urb_priv->num_tds_done;
+		     i < urb_priv->num_tds && xhci->devs[urb->dev->slot_id];
 		     i++) {
 			td = urb_priv->td[i];
 			if (!list_empty(&td->td_list))
@@ -1549,8 +1549,8 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 	}
 
 	urb_priv = urb->hcpriv;
-	i = urb_priv->td_cnt;
-	if (i < urb_priv->length)
+	i = urb_priv->num_tds_done;
+	if (i < urb_priv->num_tds)
 		xhci_dbg_trace(xhci, trace_xhci_dbg_cancel_urb,
 				"Cancel URB %p, dev %s, ep 0x%x, "
 				"starting at offset 0x%llx",
@@ -1560,7 +1560,7 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 					urb_priv->td[i]->start_seg,
 					urb_priv->td[i]->first_trb));
 
-	for (; i < urb_priv->length; i++) {
+	for (; i < urb_priv->num_tds; i++) {
 		td = urb_priv->td[i];
 		list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
 	}

drivers/usb/host/xhci.h

@@ -1608,8 +1608,8 @@ struct xhci_scratchpad {
 };
 
 struct urb_priv {
-	int	length;
-	int	td_cnt;
+	int	num_tds;
+	int	num_tds_done;
 	struct	xhci_td	*td[0];
 };