linux-kernel - [PATCH] staging: fbtft: fb_ra8875: Use common error handling code in write_reg8

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Date:   Thu, 2 Nov 2017 22:18:13 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     devel@...verdev.osuosl.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] staging: fbtft: fb_ra8875: Use common error handling code in
 write_reg8_bus8()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 2 Nov 2017 22:12:58 +0100

* Add a jump target so that a specific error message is stored only once
  at the end of this function implementation.

* Replace two 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/staging/fbtft/fb_ra8875.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/fbtft/fb_ra8875.c b/drivers/staging/fbtft/fb_ra8875.c
index 6d1cad85957b..6a94b5810a31 100644
--- a/drivers/staging/fbtft/fb_ra8875.c
+++ b/drivers/staging/fbtft/fb_ra8875.c
@@ -218,12 +218,9 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
 	*buf++ = 0x80;
 	*buf = (u8)va_arg(args, unsigned int);
 	ret = par->fbtftops.write(par, par->buf, 2);
-	if (ret < 0) {
-		va_end(args);
-		dev_err(par->info->device, "write() failed and returned %dn",
-			ret);
-		return;
-	}
+	if (ret < 0)
+		goto end_va;
+
 	len--;
 
 	udelay(100);
@@ -236,18 +233,19 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
 			*buf++ = (u8)va_arg(args, unsigned int);
 
 		ret = par->fbtftops.write(par, par->buf, len + 1);
-		if (ret < 0) {
-			va_end(args);
-			dev_err(par->info->device,
-				"write() failed and returned %dn", ret);
-			return;
-		}
+		if (ret < 0)
+			goto end_va;
 	}
 	va_end(args);
 
 	/* restore user spi-speed */
 	par->fbtftops.write = fbtft_write_spi;
 	udelay(100);
+	return;
+
+end_va:
+	va_end(args);
+	dev_err(par->info->device, "write() failed and returned %dn", ret);
 }
 
 static int write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
-- 
2.15.0