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| author | Jaroslav Kysela <perex@perex.cz> | 2009-06-04 02:12:18 +0400 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-06-04 03:22:07 +0400 |
| commit | 5fdc18d938c99399b73fe894bc24cb9400a1a2ee (patch) | |
| tree | 1fb20990d3d6e784f4394d762e87f6322ca1cd72 /sound | |
| parent | 872c78202c58d26596e25743791ee81a7d24abad (diff) | |
| download | linux-5fdc18d938c99399b73fe894bc24cb9400a1a2ee.tar.xz | |
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: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/core/init.c | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/sound/core/init.c b/sound/core/init.c index a578d05f9e13..d5d40d78c409 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -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); |