pinctrl: mediatek: mtk-common: initialize unmask
diff mbox

Message ID 1429528516-9245-1-git-send-email-colin.king@canonical.com
State New
Headers show

Commit Message

Colin King April 20, 2015, 11:15 a.m. UTC
From: Colin Ian King <colin.king@canonical.com>

cppcheck detected an unitialized variable:

[drivers/pinctrl/mediatek/pinctrl-mtk-common.c:897]:
  (error) Uninitialized variable: unmask

unmask should be initialized to zero to ensure unmasking
only occurs if a previous mask occurred. The current situation
is that the unmask variable could contain any random garbage
causing random unexpected unmasking.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Sergei Shtylyov April 20, 2015, 12:32 p.m. UTC | #1
Hello.

On 04/20/2015 02:15 PM, Colin King wrote:

> From: Colin Ian King <colin.king@canonical.com>

> cppcheck detected an unitialized variable:

    Uninitialized.

> [drivers/pinctrl/mediatek/pinctrl-mtk-common.c:897]:
>    (error) Uninitialized variable: unmask

> unmask should be initialized to zero to ensure unmasking
> only occurs if a previous mask occurred. The current situation
> is that the unmask variable could contain any random garbage
> causing random unexpected unmasking.

> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>   drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)

> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> index 493294c..3173125 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
> @@ -881,7 +881,8 @@ static int mtk_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
>   	if (!mtk_eint_get_mask(pctl, eint_num)) {
>   		mtk_eint_mask(d);
>   		unmask = 1;
> -	}
> +	} else
> +		unmask = 0;

    The CodingStyle dictates that there should be {} around *else* branch too.

[...]

WBR, Sergei

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Patch
diff mbox

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index 493294c..3173125 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -881,7 +881,8 @@  static int mtk_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
 	if (!mtk_eint_get_mask(pctl, eint_num)) {
 		mtk_eint_mask(d);
 		unmask = 1;
-	}
+	} else
+		unmask = 0;
 
 	clr_bit = 0xff << eint_offset;
 	writel(clr_bit, pctl->eint_reg_base + clr_offset);