conf: fix load_for_all_cards()

The 63f7745b commit is loading the driver specific configuration
multiple times which ends with the array merges (see the bug).

Introduce the loaded compound which traces the already loaded
driver configurations and skip the multiple load requests.

Fixes: https://github.com/alsa-project/alsa-lib/issues/143
Fixes: 63f7745b ("conf: extend load_for_all_cards hook (id/value table)")
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 28 insertions, 5 deletions

diff --git a/src/conf.c b/src/conf.c
index f6c80031..d863dec6 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -4325,18 +4325,23 @@ static int _snd_config_hook_table(snd_config_t *root, snd_config_t *config, snd_
 int snd_config_hook_load_for_all_cards(snd_config_t *root, snd_config_t *config, snd_config_t **dst, snd_config_t *private_data ATTRIBUTE_UNUSED)
 {
 	int card = -1, err;
+	snd_config_t *loaded;	// trace loaded cards
 	
+	err = snd_config_top(&loaded);
+	if (err < 0)
+		return err;
 	do {
 		err = snd_card_next(&card);
 		if (err < 0)
-			return err;
+			goto __fin_err;
 		if (card >= 0) {
-			snd_config_t *n, *private_data = NULL;
+			snd_config_t *n, *m, *private_data = NULL;
 			const char *driver;
 			char *fdriver = NULL;
+			bool load;
 			err = snd_determine_driver(card, &fdriver);
 			if (err < 0)
-				return err;
+				goto __fin_err;
 			if (snd_config_search(root, fdriver, &n) >= 0) {
 				if (snd_config_get_string(n, &driver) < 0) {
 					if (snd_config_get_type(n) == SND_CONFIG_TYPE_COMPOUND) {
@@ -4357,6 +4362,19 @@ int snd_config_hook_load_for_all_cards(snd_config_t *root, snd_config_t *config,
 				driver = fdriver;
 			}
 		      __std:
+			load = true;
+			err = snd_config_imake_integer(&m, driver, 1);
+			if (err < 0)
+				goto __err;
+			err = snd_config_add(loaded, m);
+			if (err < 0) {
+				if (err == -EEXIST) {
+					snd_config_delete(m);
+					load = false;
+				} else {
+					goto __err;
+				}
+			}
 			private_data = _snd_config_hook_private_data(card, driver);
 			if (!private_data) {
 				err = -ENOMEM;
@@ -4365,17 +4383,22 @@ int snd_config_hook_load_for_all_cards(snd_config_t *root, snd_config_t *config,
 			err = _snd_config_hook_table(root, config, private_data);
 			if (err < 0)
 				goto __err;
-			err = snd_config_hook_load(root, config, &n, private_data);
+			if (load)
+				err = snd_config_hook_load(root, config, &n, private_data);
 		      __err:
 			if (private_data)
 				snd_config_delete(private_data);
 			free(fdriver);
 			if (err < 0)
-				return err;
+				goto __fin_err;
 		}
 	} while (card >= 0);
+	snd_config_delete(loaded);
 	*dst = NULL;
 	return 0;
+__fin_err:
+	snd_config_delete(loaded);
+	return err;
 }
 #ifndef DOC_HIDDEN
 SND_DLSYM_BUILD_VERSION(snd_config_hook_load_for_all_cards, SND_CONFIG_DLSYM_VERSION_HOOK);