Re: [libgpiod v2][PATCH 1/4] line-request: don't accept NULL line config

[Kent Gibson <warthog618@gmail.com>]

On Thu, Feb 10, 2022 at 03:07:42PM +0100, Bartosz Golaszewski wrote:
> While it was initially agreed that NULL line_config passed to
> gpiod_chip_request_lines() would result in lines being requested with
> default config (just like a newly created struct gpiod_line_config),
> I believe this is unintuitive in the context of all other functions in
> the C library not being NULL-aware (as advertised in one of the first
> paragraphs of the documentation) and should be changed to make both
> config structures mandatory.
> 
> This is C after all and it should be both explicit and spartan. :)
> 

Fair enough.

Reviewed-by: Kent Gibson <warthog618@gmail.com>

> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
> ---
>  include/gpiod.h   | 4 +---
>  lib/line-config.c | 5 -----
>  2 files changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/include/gpiod.h b/include/gpiod.h
> index 68130ad..074e395 100644
> --- a/include/gpiod.h
> +++ b/include/gpiod.h
> @@ -173,11 +173,9 @@ int gpiod_chip_find_line(struct gpiod_chip *chip, const char *name);
>   * @brief Request a set of lines for exclusive usage.
>   * @param chip GPIO chip object.
>   * @param req_cfg Request config object.
> - * @param line_cfg Line config object. May be NULL.
> + * @param line_cfg Line config object.
>   * @return New line request object or NULL if an error occurred. The request
>   *         must be released by the caller using ::gpiod_line_request_release.
> - * @note If line_cfg is NULL, lines will be requested in input mode with no
> - *       additional parameters set.
>   */
>  struct gpiod_line_request *
>  gpiod_chip_request_lines(struct gpiod_chip *chip,
> diff --git a/lib/line-config.c b/lib/line-config.c
> index 2ac9f5f..346d331 100644
> --- a/lib/line-config.c
> +++ b/lib/line-config.c
> @@ -903,11 +903,6 @@ int gpiod_line_config_to_kernel(struct gpiod_line_config *config,
>  	uint64_t mask, values;
>  	int ret;
>  
> -	if (!config) {
> -		cfgbuf->flags = GPIO_V2_LINE_FLAG_INPUT;
> -		return 0;
> -	}
> -
>  	if (config->too_complex)
>  		goto err_2big;
>  
> -- 
> 2.30.1
>