linux-kernel - [PATCH v2 5/8] USB: cdc-acm: clean up probe error labels

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Date:   Mon, 22 Mar 2021 16:53:15 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH v2 5/8] 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@...e.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/class/cdc-acm.c | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 682772b8a4f7..e3c45f5880fc 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1324,7 +1324,7 @@ static int acm_probe(struct usb_interface *intf,
 
 	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;
@@ -1341,7 +1341,7 @@ static int acm_probe(struct usb_interface *intf,
 
 	minor = acm_alloc_minor(acm);
 	if (minor < 0)
-		goto alloc_fail1;
+		goto err_put_port;
 
 	acm->minor = minor;
 	acm->dev = usb_dev;
@@ -1372,15 +1372,15 @@ static int acm_probe(struct usb_interface *intf,
 
 	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]);
@@ -1389,13 +1389,13 @@ static int acm_probe(struct usb_interface *intf,
 		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;
@@ -1417,7 +1417,7 @@ static int acm_probe(struct usb_interface *intf,
 
 		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,
@@ -1435,7 +1435,7 @@ static int acm_probe(struct usb_interface *intf,
 
 	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 =
@@ -1492,7 +1492,7 @@ static int acm_probe(struct usb_interface *intf,
 			&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) {
@@ -1501,7 +1501,8 @@ static int acm_probe(struct usb_interface *intf,
 	}
 
 	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);
@@ -1514,21 +1515,21 @@ static int acm_probe(struct usb_interface *intf,
 				&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;
 }
 
-- 
2.26.3