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

[Bartosz Golaszewski <brgl@bgdev.pl>]

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. :)

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