linux-kernel - [PATCH v1] can: kvaser_usb: Simplify with dev_err

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Message-Id: <20240830110651.519119-1-yanzhen@vivo.com>
Date: Fri, 30 Aug 2024 19:06:51 +0800
From: Yan Zhen <yanzhen@...o.com>
To: mkl@...gutronix.de,
	mailhol.vincent@...adoo.fr,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: linux-can@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	opensource.kernel@...o.com,
	Yan Zhen <yanzhen@...o.com>
Subject: [PATCH v1] can: kvaser_usb: Simplify with dev_err_probe()

dev_err_probe() is used to log an error message during the probe process 
of a device. 

It can simplify the error path and unify a message template.

Using this helper is totally fine even if err is known to never
be -EPROBE_DEFER.

The benefit compared to a normal dev_err() is the standardized format
of the error code, it being emitted symbolically and the fact that
the error code is returned which allows more compact error paths.

Signed-off-by: Yan Zhen <yanzhen@...o.com>
---
 .../net/can/usb/kvaser_usb/kvaser_usb_core.c  | 42 +++++++------------
 1 file changed, 16 insertions(+), 26 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
index 35b4132b0639..bcf8d870af17 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -898,10 +898,8 @@ static int kvaser_usb_probe(struct usb_interface *intf,
 	ops = driver_info->ops;
 
 	err = ops->dev_setup_endpoints(dev);
-	if (err) {
-		dev_err(&intf->dev, "Cannot get usb endpoint(s)");
-		return err;
-	}
+	if (err)
+		return dev_err_probe(&intf->dev, err, "Cannot get usb endpoint(s)");
 
 	dev->udev = interface_to_usbdev(intf);
 
@@ -912,26 +910,20 @@ static int kvaser_usb_probe(struct usb_interface *intf,
 	dev->card_data.ctrlmode_supported = 0;
 	dev->card_data.capabilities = 0;
 	err = ops->dev_init_card(dev);
-	if (err) {
-		dev_err(&intf->dev,
-			"Failed to initialize card, error %d\n", err);
-		return err;
-	}
+	if (err)
+		return dev_err_probe(&intf->dev, err,
+					"Failed to initialize card\n");
 
 	err = ops->dev_get_software_info(dev);
-	if (err) {
-		dev_err(&intf->dev,
-			"Cannot get software info, error %d\n", err);
-		return err;
-	}
+	if (err)
+		return dev_err_probe(&intf->dev, err,
+					"Cannot get software info\n");
 
 	if (ops->dev_get_software_details) {
 		err = ops->dev_get_software_details(dev);
-		if (err) {
-			dev_err(&intf->dev,
-				"Cannot get software details, error %d\n", err);
-			return err;
-		}
+		if (err)
+			return dev_err_probe(&intf->dev, err,
+						"Cannot get software details\n");
 	}
 
 	if (WARN_ON(!dev->cfg))
@@ -945,18 +937,16 @@ static int kvaser_usb_probe(struct usb_interface *intf,
 	dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
 
 	err = ops->dev_get_card_info(dev);
-	if (err) {
-		dev_err(&intf->dev, "Cannot get card info, error %d\n", err);
-		return err;
-	}
+	if (err)
+		return dev_err_probe(&intf->dev, err,
+					"Cannot get card info\n");
 
 	if (ops->dev_get_capabilities) {
 		err = ops->dev_get_capabilities(dev);
 		if (err) {
-			dev_err(&intf->dev,
-				"Cannot get capabilities, error %d\n", err);
 			kvaser_usb_remove_interfaces(dev);
-			return err;
+			return dev_err_probe(&intf->dev, err,
+						"Cannot get capabilities\n");
 		}
 	}
 
-- 
2.34.1