[PATCH 45/54 v2] mfd: asic3: Be sure to clamp return value

[PATCH 45/54 v2] mfd: asic3: Be sure to clamp return value

[Linus Walleij]

As we want gpio_chip .get() calls to be able to return negative
error codes and propagate to drivers, we need to go over all
drivers and make sure their return values are clamped to [0,1].
We do this by using the ret = !!(val) design pattern.

Cc: Paul Parsons <lost.distance@yahoo.com>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2: fixed a compilation issue, I was hammering
to much on parentheses sorry.
---
 drivers/mfd/asic3.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index a726f01e3b02..927e2c2a9a39 100644
--- a/drivers/mfd/asic3.c
+++ b/drivers/mfd/asic3.c
@@ -502,7 +502,8 @@ static int asic3_gpio_get(struct gpio_chip *chip,
 		return -EINVAL;
 	}
 
-	return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask;
+	return !!(asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS)
+		  & mask);
 }
 
 static void asic3_gpio_set(struct gpio_chip *chip,
-- 
2.4.3

Re: [PATCH 45/54 v2] mfd: asic3: Be sure to clamp return value

[Lee Jones]

On Wed, 23 Dec 2015, Linus Walleij wrote:

> As we want gpio_chip .get() calls to be able to return negative
> error codes and propagate to drivers, we need to go over all
> drivers and make sure their return values are clamped to [0,1].
> We do this by using the ret = !!(val) design pattern.
> 
> Cc: Paul Parsons <lost.distance@yahoo.com>
> Cc: Lee Jones <lee.jones@linaro.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> ChangeLog v1->v2: fixed a compilation issue, I was hammering
> to much on parentheses sorry.
> ---
>  drivers/mfd/asic3.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied, thanks.

> diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
> index a726f01e3b02..927e2c2a9a39 100644
> --- a/drivers/mfd/asic3.c
> +++ b/drivers/mfd/asic3.c
> @@ -502,7 +502,8 @@ static int asic3_gpio_get(struct gpio_chip *chip,
>  		return -EINVAL;
>  	}
>  
> -	return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask;
> +	return !!(asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS)
> +		  & mask);
>  }
>  
>  static void asic3_gpio_set(struct gpio_chip *chip,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
--
To unsubscribe from this list: send the line "unsubscribe linux-gpio" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html