linux-kernel - [PATCH 1/2] pinctrl: mediatek: mt7622: fix potential uninitialized value being returned

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Date:   Wed, 10 Jan 2018 00:28:24 +0800
From:   <sean.wang@...iatek.com>
To:     <linus.walleij@...aro.org>, <linux-mediatek@...ts.infradead.org>,
        <dan.carpenter@...cle.com>, <matthias.bgg@...il.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Sean Wang <sean.wang@...iatek.com>
Subject: [PATCH 1/2] pinctrl: mediatek: mt7622: fix potential uninitialized value being returned

From: Sean Wang <sean.wang@...iatek.com>

commit d6ed93551320 ("pinctrl: mediatek: add pinctrl driver for MT7622
SoC") leads to the following static checker warning:

drivers/pinctrl/mediatek/pinctrl-mt7622.c:1419 mtk_gpio_get()
error: uninitialized symbol 'value'.
1412  static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
1413  {
1414          struct mtk_pinctrl *hw = dev_get_drvdata(chip->parent);
1415          int value;
1416
1417          mtk_hw_get_value(hw, gpio, PINCTRL_PIN_REG_DI, &value);
^^^^^^^^^^^^^^^^
1418
1419          return !!value;
1420  }

The appropriate error handling must be added to avoid the potential error
caused by uninitialized value being returned.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
---
 drivers/pinctrl/mediatek/pinctrl-mt7622.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mt7622.c b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
index 3824d82..dc32e3c 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mt7622.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
@@ -1412,9 +1412,11 @@ static struct pinctrl_desc mtk_desc = {
 static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
 {
 	struct mtk_pinctrl *hw = dev_get_drvdata(chip->parent);
-	int value;
+	int value, err;
 
-	mtk_hw_get_value(hw, gpio, PINCTRL_PIN_REG_DI, &value);
+	err = mtk_hw_get_value(hw, gpio, PINCTRL_PIN_REG_DI, &value);
+	if (err)
+		return err;
 
 	return !!value;
 }
-- 
2.7.4