linux-kernel - [PATCH AUTOSEL 4.19 502/671] rtc: rv3029: revert error handling patch to rv3029_eeprom

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Date:   Thu, 16 Jan 2020 12:02:20 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Tom Evans <tom.evans@...ec.com.au>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Sasha Levin <sashal@...nel.org>, linux-rtc@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 502/671] rtc: rv3029: revert error handling patch to rv3029_eeprom_write()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit a6f26606ddd03c5eab8b2132f1bfaa768c06158f ]

My error handling "cleanup" was totally wrong.  Both the "err" and "ret"
variables are required.  The "err" variable holds the error codes for
rv3029_eeprom_enter/exit() and the "ret" variable holds the error codes
for if actual write fails.  In my patch if the write failed, the
function probably still returned success.

Reported-by: Tom Evans <tom.evans@...ec.com.au>
Fixes: 97f5b0379c38 ("rtc: rv3029: Clean up error handling in rv3029_eeprom_write()")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: https://lore.kernel.org/r/20190817065604.GB29951@mwanda
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/rtc/rtc-rv3029c2.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
index 3d6174eb32f6..cfe3aece51d1 100644
--- a/drivers/rtc/rtc-rv3029c2.c
+++ b/drivers/rtc/rtc-rv3029c2.c
@@ -282,13 +282,13 @@ static int rv3029_eeprom_read(struct device *dev, u8 reg,
 static int rv3029_eeprom_write(struct device *dev, u8 reg,
 			       u8 const buf[], size_t len)
 {
-	int ret;
+	int ret, err;
 	size_t i;
 	u8 tmp;
 
-	ret = rv3029_eeprom_enter(dev);
-	if (ret < 0)
-		return ret;
+	err = rv3029_eeprom_enter(dev);
+	if (err < 0)
+		return err;
 
 	for (i = 0; i < len; i++, reg++) {
 		ret = rv3029_read_regs(dev, reg, &tmp, 1);
@@ -304,11 +304,11 @@ static int rv3029_eeprom_write(struct device *dev, u8 reg,
 			break;
 	}
 
-	ret = rv3029_eeprom_exit(dev);
-	if (ret < 0)
-		return ret;
+	err = rv3029_eeprom_exit(dev);
+	if (err < 0)
+		return err;
 
-	return 0;
+	return ret;
 }
 
 static int rv3029_eeprom_update_bits(struct device *dev,
-- 
2.20.1