linux-kernel - [PATCH] hwmon/amc6821: Use common error handling code in amc6821_init

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Date:   Tue, 24 Oct 2017 22:10:13 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-hwmon@...r.kernel.org,
        Günter Röck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] hwmon/amc6821: Use common error handling code in
 amc6821_init_client()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 24 Oct 2017 22:04:20 +0200

* Add two jump targets so that a bit of exception handling can be better
  reused at the end of this function.

  This issue was detected by using the Coccinelle software.

* Delete the local variable "err" which became unnecessary
  with this refactoring.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/hwmon/amc6821.c | 77 ++++++++++++++++++-------------------------------
 1 file changed, 28 insertions(+), 49 deletions(-)

diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
index 46b4e35fd555..5c067de3fdcf 100644
--- a/drivers/hwmon/amc6821.c
+++ b/drivers/hwmon/amc6821.c
@@ -885,70 +885,42 @@ static int amc6821_detect(
 static int amc6821_init_client(struct i2c_client *client)
 {
 	int config;
-	int err = -EIO;
 
 	if (init) {
 		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
-
-		if (config < 0) {
-				dev_err(&client->dev,
-			"Error reading configuration register, aborting.\n");
-				return err;
-		}
+		if (config < 0)
+			goto report_read_failure;
 
 		config |= AMC6821_CONF4_MODE;
-
 		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
-				config)) {
-			dev_err(&client->dev,
-			"Configuration register write error, aborting.\n");
-			return err;
-		}
+					      config))
+			goto report_write_failure;
 
 		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
-
-		if (config < 0) {
-			dev_err(&client->dev,
-			"Error reading configuration register, aborting.\n");
-			return err;
-		}
+		if (config < 0)
+			goto report_read_failure;
 
 		dev_info(&client->dev, "Revision %d\n", config & 0x0f);
 
 		config &= ~AMC6821_CONF3_THERM_FAN_EN;
-
 		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
-				config)) {
-			dev_err(&client->dev,
-			"Configuration register write error, aborting.\n");
-			return err;
-		}
+					      config))
+			goto report_write_failure;
 
 		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
-
-		if (config < 0) {
-			dev_err(&client->dev,
-			"Error reading configuration register, aborting.\n");
-			return err;
-		}
+		if (config < 0)
+			goto report_read_failure;
 
 		config &= ~AMC6821_CONF2_RTFIE;
 		config &= ~AMC6821_CONF2_LTOIE;
 		config &= ~AMC6821_CONF2_RTOIE;
-		if (i2c_smbus_write_byte_data(client,
-				AMC6821_REG_CONF2, config)) {
-			dev_err(&client->dev,
-			"Configuration register write error, aborting.\n");
-			return err;
-		}
+		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF2,
+					      config))
+			goto report_write_failure;
 
 		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
-
-		if (config < 0) {
-			dev_err(&client->dev,
-			"Error reading configuration register, aborting.\n");
-			return err;
-		}
+		if (config < 0)
+			goto report_read_failure;
 
 		config &= ~AMC6821_CONF1_THERMOVIE;
 		config &= ~AMC6821_CONF1_FANIE;
@@ -958,14 +930,21 @@ static int amc6821_init_client(struct i2c_client *client)
 		else
 			config &= ~AMC6821_CONF1_PWMINV;
 
-		if (i2c_smbus_write_byte_data(
-				client, AMC6821_REG_CONF1, config)) {
-			dev_err(&client->dev,
-			"Configuration register write error, aborting.\n");
-			return err;
-		}
+		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1,
+					      config))
+			goto report_write_failure;
 	}
 	return 0;
+
+report_read_failure:
+	dev_err(&client->dev,
+		"Error reading configuration register, aborting.\n");
+	return -EIO;
+
+report_write_failure:
+	dev_err(&client->dev,
+		"Configuration register write error, aborting.\n");
+	return -EIO;
 }
 
 static int amc6821_probe(struct i2c_client *client,
-- 
2.14.3