greybus: es2: separate urb allocation and submission

Refactor in-urb submission, and make sure to separate allocation and
submission.

Eventually we'll be submitting the urbs at cport enable rather than at
probe, and this is also needed for the driver-model rework.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/es2.c

@@ -209,6 +209,35 @@ static int unmap_cport(struct es2_ap_dev *es2, u16 cport_id)
 }
 #endif
 
+static int es2_cport_in_enable(struct es2_ap_dev *es2,
+				struct es2_cport_in *cport_in)
+{
+	struct urb *urb;
+	int ret;
+	int i;
+
+	for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
+		urb = cport_in->urb[i];
+
+		ret = usb_submit_urb(urb, GFP_KERNEL);
+		if (ret) {
+			dev_err(&es2->usb_dev->dev,
+					"failed to submit in-urb: %d\n", ret);
+			goto err_kill_urbs;
+		}
+	}
+
+	return 0;
+
+err_kill_urbs:
+	for (--i; i >= 0; --i) {
+		urb = cport_in->urb[i];
+		usb_kill_urb(urb);
+	}
+
+	return ret;
+}
+
 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
 {
 	struct urb *urb = NULL;
@@ -853,7 +882,7 @@ static int ap_probe(struct usb_interface *interface,
 		goto error;
 	}
 
-	/* Allocate buffers for our cport in messages and start them up */
+	/* Allocate buffers for our cport in messages */
 	for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
 		struct es2_cport_in *cport_in = &es2->cport_in[bulk_in];
 
@@ -875,9 +904,6 @@ static int ap_probe(struct usb_interface *interface,
 					  cport_in_callback, hd);
 			cport_in->urb[i] = urb;
 			cport_in->buffer[i] = buffer;
-			retval = usb_submit_urb(urb, GFP_KERNEL);
-			if (retval)
-				goto error;
 		}
 	}
 
@@ -898,6 +924,13 @@ static int ap_probe(struct usb_interface *interface,
 							(S_IWUSR | S_IRUGO),
 							gb_debugfs_get(), es2,
 							&apb_log_enable_fops);
+
+	for (i = 0; i < NUM_BULKS; ++i) {
+		retval = es2_cport_in_enable(es2, &es2->cport_in[i]);
+		if (retval)
+			goto error;
+	}
+
 	return 0;
 error:
 	ap_disconnect(interface);