From: Linus Walleij Date: Mon, 21 Dec 2015 10:12:55 +0000 (+0100) Subject: gpio: max732x: Be sure to clamp return value X-Git-Tag: v4.14-rc1~3997^2~166 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f96600873e368e9fae53c3485972db2252f9f12c;p=platform%2Fkernel%2Flinux-rpi.git gpio: max732x: Be sure to clamp return value 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. Also start to propagate the error code here as the end of the series fixes this to work for all drivers. Cc: Semen Protsenko Reviewed-by: Marek Vasut Reviewed-by:Nicholas Krause Signed-off-by: Linus Walleij --- diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c index a109498..880ce94 100644 --- a/drivers/gpio/gpio-max732x.c +++ b/drivers/gpio/gpio-max732x.c @@ -207,9 +207,9 @@ static int max732x_gpio_get_value(struct gpio_chip *gc, unsigned off) ret = max732x_readb(chip, is_group_a(chip, off), ®_val); if (ret < 0) - return 0; + return ret; - return reg_val & (1u << (off & 0x7)); + return !!(reg_val & (1u << (off & 0x7))); } static void max732x_gpio_set_mask(struct gpio_chip *gc, unsigned off, int mask,