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ALSA: Introduce snd_card_create() 

Introduced snd_card_create() function as a replacement of snd_card_new().
The new function returns a negative error code so that the probe callback
can return the proper error code, while snd_card_new() can give only NULL
check.

The old snd_card_new() is still provided as an inline function but with
__deprecated attribute.  It'll be removed soon later.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-12-28 16:32:08 +01:00 committed by Takashi Iwai
parent c59765042f
commit 53fb1e6359
2 changed files with 44 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/sound/core.h
View File

@ -296,8 +296,20 @@ int snd_card_locked(int card);
extern int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int cmd);
#endif
int snd_card_create(int idx, const char *id,
struct module *module, int extra_size,
struct snd_card **card_ret);
static inline __deprecated
struct snd_card *snd_card_new(int idx, const char *id,
struct module *module, int extra_size);
struct module *module, int extra_size)
{
struct snd_card *card;
if (snd_card_create(idx, id, module, extra_size, &card) < 0)
return NULL;
return card;
}
int snd_card_disconnect(struct snd_card *card);
int snd_card_free(struct snd_card *card);
int snd_card_free_when_closed(struct snd_card *card);

47
sound/core/init.c
View File

@ -121,31 +121,44 @@ static inline int init_info_for_card(struct snd_card *card)
#endif
/**
* snd_card_new - create and initialize a soundcard structure
* snd_card_create - create and initialize a soundcard structure
* @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
* @xid: card identification (ASCII string)
* @module: top level module for locking
* @extra_size: allocate this extra size after the main soundcard structure
* @card_ret: the pointer to store the created card instance
*
* Creates and initializes a soundcard structure.
*
* Returns kmallocated snd_card structure. Creates the ALSA control interface
* (which is blocked until snd_card_register function is called).
* The function allocates snd_card instance via kzalloc with the given
* space for the driver to use freely. The allocated struct is stored
* in the given card_ret pointer.
*
* Returns zero if successful or a negative error code.
*/
struct snd_card *snd_card_new(int idx, const char *xid,
struct module *module, int extra_size)
int snd_card_create(int idx, const char *xid,
struct module *module, int extra_size,
struct snd_card **card_ret)
{
struct snd_card *card;
int err, idx2;
if (snd_BUG_ON(!card_ret))
return -EINVAL;
*card_ret = NULL;
if (extra_size < 0)
extra_size = 0;
card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
if (card == NULL)
return NULL;
if (!card)
return -ENOMEM;
if (xid) {
if (!snd_info_check_reserved_words(xid))
if (!snd_info_check_reserved_words(xid)) {
snd_printk(KERN_ERR
"given id string '%s' is reserved.\n", xid);
err = -EBUSY;
goto __error;
}
strlcpy(card->id, xid, sizeof(card->id));
}
err = 0;
@ -202,26 +215,28 @@ struct snd_card *snd_card_new(int idx, const char *xid,
#endif
/* the control interface cannot be accessed from the user space until */
/* snd_cards_bitmask and snd_cards are set with snd_card_register */
if ((err = snd_ctl_create(card)) < 0) {
snd_printd("unable to register control minors\n");
err = snd_ctl_create(card);
if (err < 0) {
snd_printk(KERN_ERR "unable to register control minors\n");
goto __error;
}
if ((err = snd_info_card_create(card)) < 0) {
snd_printd("unable to create card info\n");
err = snd_info_card_create(card);
if (err < 0) {
snd_printk(KERN_ERR "unable to create card info\n");
goto __error_ctl;
}
if (extra_size > 0)
card->private_data = (char *)card + sizeof(struct snd_card);
return card;
*card_ret = card;
return 0;
__error_ctl:
snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
__error:
kfree(card);
return NULL;
return err;
}
EXPORT_SYMBOL(snd_card_new);
EXPORT_SYMBOL(snd_card_create);
/* return non-zero if a card is already locked */
int snd_card_locked(int card)