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Commit 5fdc18d9 authored by Jaroslav Kysela's avatar Jaroslav Kysela Committed by Takashi Iwai
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ALSA: Core - clean up snd_card_set_id* calls and remove possible id collision 



Move locking outside snd_card_set_id_internal() function and rename it
to snd_card_set_id_no_lock() for better function description.

User defined id is just copied to card structure at allocation time.
The real unique id procedure is called in snd_card_register() to
ensure real atomicity.

Signed-off-by: default avatarJaroslav Kysela <perex@perex.cz>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 872c7820

sound/core/init.c

+10 −16
Original line number Diff line number Diff line
@@ -153,7 +153,7 @@ int snd_card_create(int idx, const char *xid, 
	if (!card)

		return -ENOMEM;

	if (xid)

		snd_card_set_id(card, xid);

		strlcpy(card->id, xid, sizeof(card->id));

	err = 0;

	mutex_lock(&snd_card_mutex);

	if (idx < 0) {
@@ -476,16 +476,12 @@ int snd_card_free(struct snd_card *card) 


EXPORT_SYMBOL(snd_card_free);



static void snd_card_set_id_internal(struct snd_card *card, const char *nid,

				     int do_locking)

static void snd_card_set_id_no_lock(struct snd_card *card, const char *nid)

{

	int i, len, idx_flag = 0, loops = SNDRV_CARDS;

	const char *spos, *src;

	char *id;

	

	/* check if user specified own card->id */

	if (card->id[0] != '\0')

		return;

	if (nid == NULL) {

		id = card->shortname;

		spos = src = id;
@@ -522,16 +518,10 @@ static void snd_card_set_id_internal(struct snd_card *card, const char *nid, 
      		}

	      	if (!snd_info_check_reserved_words(id))

      			goto __change;

		if (do_locking)

			mutex_lock(&snd_card_mutex);

		for (i = 0; i < snd_ecards_limit; i++) {

			if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) {

				mutex_unlock(&snd_card_mutex);

			if (snd_cards[i] && !strcmp(snd_cards[i]->id, id))

				goto __change;

		}

		}

		if (do_locking)

			mutex_unlock(&snd_card_mutex);

		break;



	      __change:
@@ -566,7 +556,12 @@ static void snd_card_set_id_internal(struct snd_card *card, const char *nid, 
 */

void snd_card_set_id(struct snd_card *card, const char *nid)

{

	snd_card_set_id_internal(card, nid, 1);

	/* check if user specified own card->id */

	if (card->id[0] != '\0')

		return;

	mutex_lock(&snd_card_mutex);

	snd_card_set_id_no_lock(card, nid);

	mutex_unlock(&snd_card_mutex);

}

EXPORT_SYMBOL(snd_card_set_id);
@@ -663,8 +658,7 @@ int snd_card_register(struct snd_card *card) 
		mutex_unlock(&snd_card_mutex);

		return 0;

	}

	if (card->id[0] == '\0')

		snd_card_set_id_internal(card, NULL, 0);

	snd_card_set_id_no_lock(card, card->id[0] == '\0' ? NULL : card->id);

	snd_cards[card->number] = card;

	mutex_unlock(&snd_card_mutex);

	init_info_for_card(card);