Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

On Thu, Sep 20, 2018 at 05:48:22PM +0200, Janusz Krzysztofik wrote:
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a53d17745d21..5bc3447949c9 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -2880,7 +2880,7 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
>  			__set_bit(hwgpio, mask);
>  
>  			if (array_info)
> -				find_next_zero_bit(array_info->get_mask,
> +				i = find_next_zero_bit(array_info->get_mask,
>  						   array_size, i);

We could mark find_next_zero_bit() and friends as a __must_check
functions so we avoid this bug in the future.  I have a more complicated
idea how to detect these bugs in a generic way using Smatch but it will
take longer to implement.

regards,
dan carpenter