greybus: es2: remove bulk_out array

We only care about one bulk out endpoint, the first one, so remove
the pretense of keeping an array of these things.  Just grab the first
one in the list and run away!
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/es2.c

@@ -83,13 +83,6 @@ struct es2_cport_in {
 	u8 *buffer[NUM_CPORT_IN_URB];
 };
 
-/*
- * @endpoint: bulk out endpoint for CPort data
- */
-struct es2_cport_out {
-	__u8 endpoint;
-};
-
 /**
  * es2_ap_dev - ES2 USB Bridge to AP structure
  * @usb_dev: pointer to the USB device we are.
@@ -97,7 +90,7 @@ struct es2_cport_out {
  * @hd: pointer to our gb_host_device structure
 
  * @cport_in: endpoint, urbs and buffer for cport in messages
- * @cport_out: endpoint for for cport out messages
+ * @cport_out_endpoint: endpoint for for cport out messages
  * @cport_out_urb: array of urbs for the CPort out messages
  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  *			not.
@@ -122,7 +115,7 @@ struct es2_ap_dev {
 	struct gb_host_device *hd;
 
 	struct es2_cport_in cport_in[NUM_BULKS];
-	struct es2_cport_out cport_out[NUM_BULKS];
+	__u8 cport_out_endpoint;
 	struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
 	bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
 	bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
@@ -466,7 +459,7 @@ static int message_send(struct gb_host_device *hd, u16 cport_id,
 
 	usb_fill_bulk_urb(urb, udev,
 			  usb_sndbulkpipe(udev,
-					  es2->cport_out[0].endpoint),
+					  es2->cport_out_endpoint),
 			  message->buffer, buffer_size,
 			  cport_out_callback, message);
 	urb->transfer_flags |= URB_ZERO_PACKET;
@@ -1420,10 +1413,10 @@ static int ap_probe(struct usb_interface *interface,
 	struct usb_host_interface *iface_desc;
 	struct usb_endpoint_descriptor *endpoint;
 	int bulk_in = 0;
-	int bulk_out = 0;
 	int retval;
 	int i;
 	int num_cports;
+	bool bulk_out_found = false;
 
 	udev = usb_get_dev(interface_to_usbdev(interface));
 
@@ -1474,16 +1467,17 @@ static int ap_probe(struct usb_interface *interface,
 				es2->arpc_endpoint_in =
 					endpoint->bEndpointAddress;
 			bulk_in++;
-		} else if (usb_endpoint_is_bulk_out(endpoint)) {
-			es2->cport_out[bulk_out++].endpoint =
-				endpoint->bEndpointAddress;
+		} else if (usb_endpoint_is_bulk_out(endpoint) &&
+			   (!bulk_out_found)) {
+			es2->cport_out_endpoint = endpoint->bEndpointAddress;
+			bulk_out_found = true;
 		} else {
 			dev_err(&udev->dev,
 				"Unknown endpoint type found, address 0x%02x\n",
 				endpoint->bEndpointAddress);
 		}
 	}
-	if (bulk_in != NUM_BULKS_IN || bulk_out != NUM_BULKS_OUT) {
+	if (bulk_in != NUM_BULKS_IN || !bulk_out_found) {
 		dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
 		retval = -ENODEV;
 		goto error;