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can: esd_usb: Rework display of error messages

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- esd_usb_open(): Get rid of duplicate "couldn't start device: %d\n"
  message already printed from esd_usb_start().
- Fix duplicate printout of network device name when network device
  is registered. Add an unregister message for the network device
  as counterpart to the register message.
- Add the printout of error codes together with the error messages
  in esd_usb_close() and some in esd_usb_probe(). The additional error
  codes should lead to a better understanding what is really going
  wrong.
- Convert all occurrences of error status prints to use "ERR_PTR(err)"
  instead of printing the decimal value of "err".
- Rename retval to err in esd_usb_read_bulk_callback() to make the
  naming of error status variables consistent with all other functions.

Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
Link: https://patch.msgid.link/20250821143422.3567029-5-stefan.maetje@esd.eu
[mkl: minor change patch description to imperative language]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Stefan Mätje
2025-08-21 16:34:21 +02:00
committed by Marc Kleine-Budde
parent 79edb88b89
commit c6e0752143
1 changed files with 20 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/net/can/usb/esd_usb.c
+20 -16
View File
@@ -9,6 +9,7 @@
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
#include <linux/err.h>
#include <linux/ethtool.h>
#include <linux/module.h>
#include <linux/netdevice.h>
@@ -480,7 +481,7 @@ static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv,
static void esd_usb_read_bulk_callback(struct urb *urb)
{
struct esd_usb *dev = urb->context;
int retval;
int err;
int pos = 0;
int i;
@@ -496,7 +497,7 @@ static void esd_usb_read_bulk_callback(struct urb *urb)
default:
dev_info(dev->udev->dev.parent,
"Rx URB aborted (%d)\n", urb->status);
"Rx URB aborted (%pe)\n", ERR_PTR(urb->status));
goto resubmit_urb;
}
@@ -539,15 +540,15 @@ resubmit_urb:
urb->transfer_buffer, ESD_USB_RX_BUFFER_SIZE,
esd_usb_read_bulk_callback, dev);
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval == -ENODEV) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err == -ENODEV) {
for (i = 0; i < dev->net_count; i++) {
if (dev->nets[i])
netif_device_detach(dev->nets[i]->netdev);
}
} else if (retval) {
} else if (err) {
dev_err(dev->udev->dev.parent,
"failed resubmitting read bulk urb: %d\n", retval);
"failed resubmitting read bulk urb: %pe\n", ERR_PTR(err));
}
}
@@ -572,7 +573,7 @@ static void esd_usb_write_bulk_callback(struct urb *urb)
return;
if (urb->status)
netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
netdev_info(netdev, "Tx URB aborted (%pe)\n", ERR_PTR(urb->status));
netif_trans_update(netdev);
}
@@ -758,7 +759,7 @@ out:
if (err == -ENODEV)
netif_device_detach(netdev);
if (err)
netdev_err(netdev, "couldn't start device: %d\n", err);
netdev_err(netdev, "couldn't start device: %pe\n", ERR_PTR(err));
kfree(msg);
return err;
@@ -800,7 +801,6 @@ static int esd_usb_open(struct net_device *netdev)
/* finally start device */
err = esd_usb_start(priv);
if (err) {
netdev_warn(netdev, "couldn't start device: %d\n", err);
close_candev(netdev);
return err;
}
@@ -923,7 +923,7 @@ static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb,
if (err == -ENODEV)
netif_device_detach(netdev);
else
netdev_warn(netdev, "failed tx_urb %d\n", err);
netdev_warn(netdev, "failed tx_urb %pe\n", ERR_PTR(err));
goto releasebuf;
}
@@ -951,6 +951,7 @@ static int esd_usb_close(struct net_device *netdev)
{
struct esd_usb_net_priv *priv = netdev_priv(netdev);
union esd_usb_msg *msg;
int err;
int i;
msg = kmalloc(sizeof(*msg), GFP_KERNEL);
@@ -964,8 +965,9 @@ static int esd_usb_close(struct net_device *netdev)
msg->filter.option = ESD_USB_ID_ENABLE; /* start with segment 0 */
for (i = 0; i <= ESD_USB_MAX_ID_SEGMENT; i++)
msg->filter.mask[i] = 0;
if (esd_usb_send_msg(priv->usb, msg) < 0)
netdev_err(netdev, "sending idadd message failed\n");
err = esd_usb_send_msg(priv->usb, msg);
if (err < 0)
netdev_err(netdev, "sending idadd message failed: %pe\n", ERR_PTR(err));
/* set CAN controller to reset mode */
msg->hdr.len = sizeof(struct esd_usb_set_baudrate_msg) / sizeof(u32); /* # of 32bit words */
@@ -973,8 +975,9 @@ static int esd_usb_close(struct net_device *netdev)
msg->setbaud.net = priv->index;
msg->setbaud.rsvd = 0;
msg->setbaud.baud = cpu_to_le32(ESD_USB_NO_BAUDRATE);
if (esd_usb_send_msg(priv->usb, msg) < 0)
netdev_err(netdev, "sending setbaud message failed\n");
err = esd_usb_send_msg(priv->usb, msg);
if (err < 0)
netdev_err(netdev, "sending setbaud message failed: %pe\n", ERR_PTR(err));
priv->can.state = CAN_STATE_STOPPED;
@@ -1251,14 +1254,14 @@ static int esd_usb_probe_one_net(struct usb_interface *intf, int index)
err = register_candev(netdev);
if (err) {
dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
dev_err(&intf->dev, "couldn't register CAN device: %pe\n", ERR_PTR(err));
free_candev(netdev);
err = -ENOMEM;
goto done;
}
dev->nets[index] = priv;
netdev_info(netdev, "device %s registered\n", netdev->name);
netdev_info(netdev, "registered\n");
done:
return err;
@@ -1357,6 +1360,7 @@ static void esd_usb_disconnect(struct usb_interface *intf)
for (i = 0; i < dev->net_count; i++) {
if (dev->nets[i]) {
netdev = dev->nets[i]->netdev;
netdev_info(netdev, "unregister\n");
unregister_netdev(netdev);
free_candev(netdev);
}