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>
diff --git a/sound/core/init.c b/sound/core/init.c
index 0d5520c..dc4b80c 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -121,31 +121,44 @@
#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 @@
#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)