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ALSA: control: Introduce snd_ctl_find_id_mixer_locked()

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Adds wrapper function snd_ctl_find_id_mixer_locked(). This is
identical to snd_ctl_find_id_mixer() except that it can be called
from code that is already holding controls_rwsem.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://msgid.link/r/20240401100210.61277-2-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Richard Fitzgerald 2024-04-01 10:02:08 +00:00 committed by Mark Brown
parent 2ae143fb3a
commit 08ea486a61
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1 changed files with 23 additions and 0 deletions
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23
include/sound/control.h
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@ -167,6 +167,29 @@ snd_ctl_find_id_mixer(struct snd_card *card, const char *name)
return snd_ctl_find_id(card, &id);
}
/**
* snd_ctl_find_id_mixer_locked - find the control instance with the given name string
* @card: the card instance
* @name: the name string
*
* Finds the control instance with the given name and
* @SNDRV_CTL_ELEM_IFACE_MIXER. Other fields are set to zero.
*
* This is merely a wrapper to snd_ctl_find_id_locked().
* The caller must down card->controls_rwsem before calling this function.
*
* Return: The pointer of the instance if found, or %NULL if not.
*/
static inline struct snd_kcontrol *
snd_ctl_find_id_mixer_locked(struct snd_card *card, const char *name)
{
struct snd_ctl_elem_id id = {};
id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
strscpy(id.name, name, sizeof(id.name));
return snd_ctl_find_id_locked(card, &id);
}
int snd_ctl_create(struct snd_card *card);
int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);