[PATCH 50/54] mfd: ucb1x00-core: Be sure to clamp return value

[PATCH 50/54] mfd: ucb1x00-core: 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: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Lee: as mentioned in 00/54: either apply this directly
or ACK it and I will take it into the GPIO tree.
---
 drivers/mfd/ucb1x00-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c
index a6ec7cc0fac6..bcafe1ecd71c 100644
--- a/drivers/mfd/ucb1x00-core.c
+++ b/drivers/mfd/ucb1x00-core.c
@@ -133,7 +133,7 @@ static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset)
 	val = ucb1x00_reg_read(ucb, UCB_IO_DATA);
 	ucb1x00_disable(ucb);
 
-	return val & (1 << offset);
+	return !!(val & (1 << offset));
 }
 
 static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-- 
2.4.3

Re: [PATCH 50/54] mfd: ucb1x00-core: Be sure to clamp return value

[Lee Jones]

On Tue, 22 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: Lee Jones <lee.jones@linaro.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> Lee: as mentioned in 00/54: either apply this directly
> or ACK it and I will take it into the GPIO tree.
> ---
>  drivers/mfd/ucb1x00-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

> diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c
> index a6ec7cc0fac6..bcafe1ecd71c 100644
> --- a/drivers/mfd/ucb1x00-core.c
> +++ b/drivers/mfd/ucb1x00-core.c
> @@ -133,7 +133,7 @@ static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset)
>  	val = ucb1x00_reg_read(ucb, UCB_IO_DATA);
>  	ucb1x00_disable(ucb);
>  
> -	return val & (1 << offset);
> +	return !!(val & (1 << offset));
>  }
>  
>  static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset)

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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