USB: cdc-acm: clean up probe error labels

Name the probe error labels after what they do rather than using
sequence numbers which is harder to review and maintain (e.g. may
require renaming unrelated labels when a label is added or removed).

Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210322155318.9837-6-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/class/cdc-acm.c

@@ -1337,7 +1337,7 @@ made_compressed_probe:
 
 	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
 	if (acm == NULL)
-		goto alloc_fail;
+		return -ENOMEM;
 
 	tty_port_init(&acm->port);
 	acm->port.ops = &acm_port_ops;
@@ -1354,7 +1354,7 @@ made_compressed_probe:
 
 	minor = acm_alloc_minor(acm);
 	if (minor < 0)
-		goto alloc_fail1;
+		goto err_put_port;
 
 	acm->minor = minor;
 	acm->dev = usb_dev;
@@ -1385,15 +1385,15 @@ made_compressed_probe:
 
 	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
 	if (!buf)
-		goto alloc_fail1;
+		goto err_put_port;
 	acm->ctrl_buffer = buf;
 
 	if (acm_write_buffers_alloc(acm) < 0)
-		goto alloc_fail2;
+		goto err_free_ctrl_buffer;
 
 	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!acm->ctrlurb)
-		goto alloc_fail3;
+		goto err_free_write_buffers;
 
 	for (i = 0; i < num_rx_buf; i++) {
 		struct acm_rb *rb = &(acm->read_buffers[i]);
@@ -1402,13 +1402,13 @@ made_compressed_probe:
 		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
 								&rb->dma);
 		if (!rb->base)
-			goto alloc_fail4;
+			goto err_free_read_urbs;
 		rb->index = i;
 		rb->instance = acm;
 
 		urb = usb_alloc_urb(0, GFP_KERNEL);
 		if (!urb)
-			goto alloc_fail4;
+			goto err_free_read_urbs;
 
 		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 		urb->transfer_dma = rb->dma;
@@ -1430,7 +1430,7 @@ made_compressed_probe:
 
 		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
 		if (snd->urb == NULL)
-			goto alloc_fail5;
+			goto err_free_write_urbs;
 
 		if (usb_endpoint_xfer_int(epwrite))
 			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
@@ -1448,7 +1448,7 @@ made_compressed_probe:
 
 	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
 	if (i < 0)
-		goto alloc_fail5;
+		goto err_free_write_urbs;
 
 	if (h.usb_cdc_country_functional_desc) { /* export the country data */
 		struct usb_cdc_country_functional_desc * cfd =
@@ -1505,7 +1505,7 @@ skip_countries:
 			&control_interface->dev);
 	if (IS_ERR(tty_dev)) {
 		rv = PTR_ERR(tty_dev);
-		goto alloc_fail6;
+		goto err_release_data_interface;
 	}
 
 	if (quirks & CLEAR_HALT_CONDITIONS) {
@@ -1514,7 +1514,8 @@ skip_countries:
 	}
 
 	return 0;
-alloc_fail6:
+
+err_release_data_interface:
 	if (!acm->combined_interfaces) {
 		/* Clear driver data so that disconnect() returns early. */
 		usb_set_intfdata(data_interface, NULL);
@@ -1527,21 +1528,21 @@ alloc_fail6:
 				&dev_attr_iCountryCodeRelDate);
 	}
 	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
-alloc_fail5:
+err_free_write_urbs:
 	for (i = 0; i < ACM_NW; i++)
 		usb_free_urb(acm->wb[i].urb);
-alloc_fail4:
+err_free_read_urbs:
 	for (i = 0; i < num_rx_buf; i++)
 		usb_free_urb(acm->read_urbs[i]);
 	acm_read_buffers_free(acm);
 	usb_free_urb(acm->ctrlurb);
-alloc_fail3:
+err_free_write_buffers:
 	acm_write_buffers_free(acm);
-alloc_fail2:
+err_free_ctrl_buffer:
 	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
-alloc_fail1:
+err_put_port:
 	tty_port_put(&acm->port);
-alloc_fail:
+
 	return rv;
 }