linux-kernel - [PATCH] Input-as5011: Use common error handling code in as5011_configure

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Date:   Thu, 26 Oct 2017 20:55:54 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-input@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Fabien Marteau <fabien.marteau@...adeus.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] Input-as5011: Use common error handling code in
 as5011_configure_chip()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 26 Oct 2017 20:48:49 +0200

Add a jump target so that a specific error message is stored only once
at the end of this function implementation.
Replace four calls of the function "dev_err" by goto statements.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/input/joystick/as5011.c | 28 ++++++++++++----------------
 1 file changed, 12 insertions(+), 16 deletions(-)

diff --git a/drivers/input/joystick/as5011.c b/drivers/input/joystick/as5011.c
index 005d852a06e9..1858ebec020a 100644
--- a/drivers/input/joystick/as5011.c
+++ b/drivers/input/joystick/as5011.c
@@ -192,28 +192,20 @@ static int as5011_configure_chip(struct as5011_device *as5011,
 
 	/* write threshold */
 	error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
-	if (error < 0) {
-		dev_err(&client->dev, "Can't write threshold\n");
-		return error;
-	}
+	if (error < 0)
+		goto report_write_failure;
 
 	error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
-	if (error < 0) {
-		dev_err(&client->dev, "Can't write threshold\n");
-		return error;
-	}
+	if (error < 0)
+		goto report_write_failure;
 
 	error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
-	if (error < 0) {
-		dev_err(&client->dev, "Can't write threshold\n");
-		return error;
-	}
+	if (error < 0)
+		goto report_write_failure;
 
 	error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
-	if (error < 0) {
-		dev_err(&client->dev, "Can't write threshold\n");
-		return error;
-	}
+	if (error < 0)
+		goto report_write_failure;
 
 	/* to free irq gpio in chip */
 	error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
@@ -223,6 +215,10 @@ static int as5011_configure_chip(struct as5011_device *as5011,
 	}
 
 	return 0;
+
+report_write_failure:
+	dev_err(&client->dev, "Can't write threshold\n");
+	return error;
 }
 
 static int as5011_probe(struct i2c_client *client,
-- 
2.14.3